景寧縣七里水電站更新改造工程初步設(shè)計(jì)報(bào)告

PAGE景寧縣七里水電站更新改造工程初步設(shè)計(jì)報(bào)告景寧縣七里水電站更新改造工程初步設(shè)計(jì)報(bào)告審定：林敏慧審核：黃永庫(kù)校核：夏守高編寫：范慶躍目錄TOC\o"1-3"\h\z1、綜合說明 11.1概況 11.2自然條件 11.3工程任務(wù)和規(guī)模 11.4工程布置及建筑物 11.5水利機(jī)械、電氣工程和金屬結(jié)構(gòu) 21.6消防設(shè)計(jì) 21.7施工組織設(shè)計(jì) 31.8工程管理及安全衛(wèi)生 32、水文 82.1概述 82.2氣象 82.2.1氣象觀測(cè)站 82.2.2氣象要素統(tǒng)計(jì) 82.2.3降雨特性 82.3水文基本資料 92.4徑流 92.4.1流域面雨量計(jì)算 92.4.2月、年徑流計(jì)算 112.4.3代表年逐日徑流 142.5設(shè)計(jì)洪水 193、工程地質(zhì) 213.1區(qū)域地質(zhì) 213.2廠址及壓力管線地質(zhì) 213.3天然建筑材料 213.4結(jié)論 214、工程任務(wù)和規(guī)模 224.1工程建設(shè)的必要性 224.2工程任務(wù) 224.3工程規(guī)模 225、工程布置及建筑物 255.1工程等級(jí)及洪水設(shè)計(jì)標(biāo)準(zhǔn) 255.2設(shè)計(jì)依據(jù) 255.3工程總布置 255.4工程建筑物 266、水電機(jī)械、電氣工程及金屬結(jié)構(gòu) 316.1水力機(jī)械 316.2電氣工程 326.3其他金屬結(jié)構(gòu) 357、消防設(shè)計(jì) 367.1消防總體設(shè)計(jì)方案 367.2工程消防設(shè)計(jì) 367.3消防給水設(shè)計(jì) 377.4消防電氣 377.5主要消防設(shè)備 378、施工組織設(shè)計(jì) 388.1施工條件 388.2施工導(dǎo)流 388.3主體工程施工 388.4施工總體布置 398.5施工總進(jìn)度 399、土地處理和工程永久占地 419.1土地處理范圍和實(shí)物指標(biāo) 419.2土地處理和征用、補(bǔ)償投資費(fèi)用 419.3工程永久占地 4110、環(huán)境保護(hù)設(shè)計(jì) 4210.1設(shè)計(jì)依據(jù) 4210．2環(huán)境措施設(shè)計(jì) 4210．3環(huán)境監(jiān)測(cè) 4310．4環(huán)保、水保投資 4410．5結(jié)論 4411、工程管理設(shè)計(jì) 4511.1管理機(jī)構(gòu) 4511.2管理辦法 4512、勞動(dòng)安全與衛(wèi)生 4612.1工程概況 4612.2設(shè)計(jì)中采用的主要標(biāo)準(zhǔn)、規(guī)范 4612.3勞動(dòng)安全設(shè)計(jì) 4712.4工業(yè)衛(wèi)生設(shè)計(jì) 4813、設(shè)計(jì)概算 5113.1編制說明 5113.2概算表 5214、經(jīng)濟(jì)評(píng)價(jià) 5814.1基本依據(jù) 5814.2資金籌措與效益分析 58 景寧縣七里水電站更新改造工程初步設(shè)計(jì)第1章浙江宏昌水利設(shè)計(jì)有限公司PAGE601、綜合說明1.1概況七里水電站座落于小溪支流七里坑上，位于景寧縣城西南40km。該電站于上世紀(jì)80年代建成發(fā)電。原裝機(jī)容量為125kw。因年代已久，機(jī)組設(shè)備嚴(yán)重老化，出力不足，幾乎報(bào)廢，且當(dāng)年生產(chǎn)力水平低下，水能未能得到充分合理的開發(fā)。通過本次增容改造，充分利用水能，淘汰更換陳舊老化的機(jī)電設(shè)備，將蘊(yùn)藏的電能充分合理的開發(fā)。1.2自然條件設(shè)計(jì)流域?qū)賮啛釒Ъ撅L(fēng)區(qū)。冬季，多晴朗寒冷天氣。春季，南北氣流交替加劇，低氣壓及鋒面活動(dòng)頻繁，天氣陰晴不定，常有瀝漣春雨。初夏，由于北方冷空氣與南來的暖濕氣流相遇交綏，鋒面往往在本省滯留，形成連綿不斷的大面積“梅雨”天氣。盛夏時(shí)，在副熱帶高壓控制下，天氣晴熱少雨，降水以雷陣雨為主，若遭遇熱帶風(fēng)暴或臺(tái)風(fēng)的侵襲，形成較大暴雨。流域內(nèi)其多年平均氣溫為14℃，極端最高氣溫36.1℃，極端最低氣溫本區(qū)域系構(gòu)造剝蝕中山區(qū)，由第四系松散覆蓋層和侏羅系地層組成，巖性以熔結(jié)凝灰?guī)r為主，區(qū)內(nèi)地質(zhì)構(gòu)造不甚復(fù)雜，小型斷裂構(gòu)造和節(jié)理裂隙較為發(fā)育。本區(qū)域地震裂度為Ⅵ度。廠址及壓力管線地質(zhì)條件都較好，無影響工程建設(shè)的不利地質(zhì)。1.3工程任務(wù)和規(guī)模（1）、工程任務(wù)本樞紐工程范圍以及下游無重要的防洪保護(hù)對(duì)象，興利用水量也很少，本工程的任務(wù)是發(fā)電。（2）、工程規(guī)模本站裝機(jī)640千瓦，多年平均發(fā)電量80.91萬kwh。1.4工程布置及建筑物（1）、工程等級(jí) 根據(jù)《水利水電工程等級(jí)劃分及洪水標(biāo)準(zhǔn)》SL252-2000規(guī)定，本工程確定為五等水電樞紐工程，建筑物攔河堰壩、引水明渠、前池、壓力明鋼、廠房、升壓站等均為5級(jí)建筑物。洪水設(shè)計(jì)標(biāo)準(zhǔn)：廠房30年一遇設(shè)計(jì)，50年一遇校核。（2）、工程布置設(shè)計(jì)七里水電站原來主要由攔河壩、引水明渠、前池、壓力明鋼管、發(fā)電廠房、升壓站及生活區(qū)等組成。本次更新改造設(shè)計(jì)，根據(jù)引水流量在原堰壩、明渠的基礎(chǔ)上進(jìn)行加高修復(fù)，更換并延長(zhǎng)壓力鋼管，將廠房下移至河流七里坑出口提升發(fā)電水頭，并加大裝機(jī)容量。（3）、建筑物①、引水明渠加高修復(fù)全長(zhǎng)700m，橫斷面凈空采用0.5（寬）×1.2（高）m的矩形渠道。②、壓力鋼管采用明敷結(jié)合暗埋式布置，管徑采用700mm，管長(zhǎng)580.38m，管材采用A3鋼，壁厚為6mm。③、廠址選在河流七里坑出口處，設(shè)在右岸緩坡地上，發(fā)電主廠房平面尺寸7.74×13.74m，主廠房?jī)舾?.5m，地面高程228.00m。主廠房?jī)?nèi)設(shè)二臺(tái)發(fā)電機(jī)組，機(jī)組安裝高程228.90m。升壓站設(shè)在主廠房上游側(cè)，平面尺寸7.74×9.00m，地面高程228.00m。1.5水利機(jī)械、電氣工程和金屬結(jié)構(gòu)（1）、水利機(jī)械本電站裝機(jī)容量2×320KW，設(shè)計(jì)水頭107.00m。水輪機(jī)選用XJA-W-42/1×11配SFW320-6/740發(fā)電機(jī)。進(jìn)水閥門采用Z941H-1.6Dg400。（2）、電氣工程本電站推薦裝機(jī)2×320KW，機(jī)組為低壓出線，經(jīng)主變升壓后與10KV系統(tǒng)連接。電站的電氣主接線從經(jīng)濟(jì)性考慮采用低壓接線方式，采用一機(jī)一變的單元接線方式。升高電壓側(cè)采用單母線（高壓側(cè)電壓等級(jí)為10KV），出線一回，采用LGJ—50鋼芯鋁較線與系統(tǒng)連接。發(fā)電機(jī)選用同步發(fā)電機(jī)，型號(hào)：SFW320-6/740，其額定電流Ie=577A，額定電壓Ue=400V，額定容量Pe=320KW，額定功率因素：cosψ=0.8（滯后），額定轉(zhuǎn)速：ne=1000r/min。（3）、金屬結(jié)構(gòu)明渠渠首進(jìn)口設(shè)事故閘門1.2×1.2m一扇，喇叭口前設(shè)固定式攔污柵一扇。壓力鋼管上部與隧洞出口連接，下部至廠房分叉后與閘閥連接，壓力鋼管長(zhǎng)556.11m，管徑700mm，管材A3鋼，壁厚6mm。1.6消防設(shè)計(jì)（1）、在消防設(shè)計(jì)中遵循“預(yù)防為主、防消結(jié)合”的設(shè)計(jì)原則，同時(shí)積極采用先進(jìn)的防火技術(shù)，確保做到安全、方便、經(jīng)濟(jì)、合理。消防以水滅為主，化學(xué)來滅火為輔，消防水來自河流引水。（2）、消防給水和技術(shù)給水共用高位水池，高位水池到廠房用Ф100水管連接。備用水源采用一臺(tái)水泵從尾水池抽水，經(jīng)管道泵增壓后，提供消防所需的水量和水壓。（3）、配備的主要消防設(shè)備有：IS125-100-315型消火泵一臺(tái)；各類滅器共8只；消防器材（消防箱、消火箱、消防水槍、皮帶等）2套。1.7施工組織設(shè)計(jì)（1）、施工條件本工程廠址位于七里水電站所在河流七里坑出口,離景寧縣40KM,由省道通往廠址，交通條件比較便利。廠址至壩址有簡(jiǎn)易道路到達(dá)，由于高差，工程所需建筑材料需在壩址附近設(shè)鋼絲索道運(yùn)輸。（2）、主要建筑材料供應(yīng)和電力供應(yīng)工程所需砂石料可在下游河道內(nèi)開采,所需塊石可就地開采。水泥、鋼材由市場(chǎng)供應(yīng)。所需木材由當(dāng)?shù)厥袌?chǎng)采購(gòu)。（3）、施工導(dǎo)流施工導(dǎo)流采用分期圍堰，圍堰采用半包圍式草土包圍堰，圍堰高度2米，圍堰寬度1m，圍堰內(nèi)基坑排水采用設(shè)泵抽水排至下游。壓力管道敷設(shè)在七里坑附近，局部地段地勢(shì)地佳，需設(shè)草土包圍堰，圍堰形式同進(jìn)水口。廠區(qū)離河床存在5米左右的高差，無需圍堰。（4）、施工特性本工程主體工程量為：明挖土石方0.24萬m3，砼澆筑0.092萬m3，鋼筋制安7T，金屬制安61.10T。（5）、施工總進(jìn)度本工程施工總進(jìn)度為8個(gè)月。計(jì)劃2012年10月開工至2013年5月完工。1.8工程管理及安全衛(wèi)生（1）、管理機(jī)構(gòu)及管理范圍根據(jù)本工程的性質(zhì)及規(guī)模，按照《水利工程管理單位編制員試行標(biāo)準(zhǔn)》（SLJ705-80）及《浙江省水利水電基本建設(shè)工程設(shè)計(jì)概算編制細(xì)則》擬定管理機(jī)構(gòu)的組成和人員編制。擬定電站管理和運(yùn)行人員編制為5人，其中電站生產(chǎn)人員4人，工程管理和經(jīng)營(yíng)人員1人。根據(jù)《浙江省實(shí)施<中華人民共和國(guó)水法>辦法》，確定本工程管理范圍。（2）、安全衛(wèi)生①、勞動(dòng)安全對(duì)防火、防爆，防電氣傷害，防機(jī)械傷害、防墜落傷害，防洪、防淹及施工作業(yè)進(jìn)行了安全防護(hù)措施。②、工業(yè)衛(wèi)生對(duì)防噪聲及防振動(dòng)，溫度和濕度的控制，采光和照明，防塵、防污、防腐蝕、防毒，采取了相應(yīng)措施。1.9設(shè)計(jì)概算與經(jīng)濟(jì)評(píng)價(jià)317.47萬元，動(dòng)態(tài)總投資325.09萬元。（3）、經(jīng)濟(jì)評(píng)價(jià)本電站發(fā)電年收入33.07萬元，年發(fā)電成本8.22萬元，單位千瓦投資為4960元/kw，單位電能投資為3.92元/kw.h，其財(cái)務(wù)內(nèi)部收益為7.83%，小于規(guī)程要求的10%，國(guó)民經(jīng)濟(jì)評(píng)價(jià)中的經(jīng)濟(jì)收益率為8.66%，小于規(guī)程要求的12%。從各項(xiàng)經(jīng)濟(jì)指標(biāo)上來看，本水電站經(jīng)濟(jì)效益不好。景寧縣七里水電站更新改造工程初步設(shè)計(jì)第1章工程特性表分類名稱單位數(shù)量備注一、水文1、壩址控制集雨面積Km26.452、壩址以上主流長(zhǎng)度Km5.1333、多年平均年徑流量萬m3781.8694、多年平均流量m3/s0.2445、攔河壩P=3.33%設(shè)計(jì)洪水流量m3/s167.696、攔河壩P=0.5%校核洪水流量m3/s119.837、廠址控制集雨面積Km26.908、廠址控制河道長(zhǎng)度Km6.2829、廠房P=3.33%設(shè)計(jì)洪水流量m3/s134.0310、廠房P=2%校核洪水流量m3/s120.89二、水庫(kù)1、水庫(kù)水位校核洪水位（P=0.5%）m358.90設(shè)計(jì)洪水位（P=3.33%）m358.36正常蓄水位m356.20發(fā)電最低消落水位m—死水位m355.002、水庫(kù)庫(kù)容總庫(kù)容m3—正常庫(kù)容m3—調(diào)節(jié)庫(kù)容m3—死庫(kù)容m3—3、調(diào)節(jié)特性無調(diào)節(jié)4、水量利用系數(shù)%48.36三、工程效益指標(biāo)1、裝機(jī)容量KW6402、年平均發(fā)電量萬度80.91峰時(shí)發(fā)電量萬度47.20谷時(shí)發(fā)電量萬度33.713、年利用小時(shí)h1264.22四、淹沒及永久性占地1、水庫(kù)淹沒林地M2—2、永久占地M2479.963、臨時(shí)施工用地M26004、棄碴場(chǎng)M2600工程特性表分類名稱單位數(shù)量備注五、主要建筑物1、攔水堰壩體型式—溢流形式自由溢流溢流曲線溢流長(zhǎng)度m20壩長(zhǎng)m—最大堰高m—2、明渠橫斷面凈空m0.5×1.2渠長(zhǎng)m8003、壓力鋼管管徑mm700管長(zhǎng)m580.38埋管451.70管材A3鋼4、廠房主廠房尺寸：長(zhǎng)×寬m×m13.74×7.74升壓站m×m9.00×7.5機(jī)組安裝高程m228.90六、機(jī)電設(shè)備1、水輪機(jī)XJA-W-42/1×11臺(tái)數(shù)臺(tái)2額定轉(zhuǎn)速r/min1000額定水頭m105.00額定流量m3/s0.4142、發(fā)電機(jī)SFW320-6/740臺(tái)數(shù)臺(tái)2七、施工特性1、施工動(dòng)力變壓器容量KVA502臺(tái)2、施工導(dǎo)流導(dǎo)流型式全斷面導(dǎo)流圍堰型式土石圍巖導(dǎo)流孔尺寸mm施工總工期年0.75工程特性表分類名稱單位數(shù)量備注八、經(jīng)濟(jì)指標(biāo)1、工程靜態(tài)投資萬元317.472、工程總投資萬元325.093、年發(fā)電量收入萬元33.074、單位電能投資元/度3.925、單位千瓦投資元/KW49607、財(cái)務(wù)內(nèi)部收益率%7.838、國(guó)民經(jīng)濟(jì)內(nèi)部收益率%8.669、貸款償還年限年10.52景寧縣七里水電站更新改造工程初步設(shè)計(jì)第2章2、水文2.1概述 七里水電站座落于甌江小溪下游的支流七里坑上，位于沙灣鎮(zhèn)七里村，距離景寧縣城40km。七里水電站壩址以上控制集雨面積6.45Km2，主流長(zhǎng)度5.133Km，河道平均坡降11.6%；廠址以上控制集雨面積6.90Km2，主流長(zhǎng)度6.282Km，河道平均坡降11.2%。流域內(nèi)山坡陡峻，植被良好，以種植松樹、杉樹為主，河床切割較深，河道坡陡流急，洪水暴漲暴落。流域內(nèi)人口不多，耕地甚少，人類活動(dòng)對(duì)于自然演變影響不大，氣候、下墊面和徑流的局部變化呈現(xiàn)出相對(duì)平穩(wěn)的規(guī)律，來水、來砂特性屬于天然的相對(duì)穩(wěn)定狀態(tài)。2.2氣象2.2.1氣象觀測(cè)站設(shè)計(jì)流域內(nèi)無氣象觀測(cè)站，流域附近云和縣張家地設(shè)有氣象站。張家地氣象站氣候資料均根據(jù)中央氣象局制定的《全國(guó)地面基本氣候資料統(tǒng)計(jì)方法》及其補(bǔ)充規(guī)定進(jìn)行整編，成果可靠，為本工程氣象要素統(tǒng)計(jì)的主要依據(jù)。由于云和氣象站與設(shè)計(jì)流域高程相差較大，根據(jù)《浙江省景寧畬族自治縣水資源調(diào)查與水利區(qū)劃》用回歸計(jì)算結(jié)果分析，一般高程升高100米，氣溫降低0.6℃，降水量增加29.5mm。2.2.2設(shè)計(jì)流域地理緯度較低，屬亞熱帶季風(fēng)氣候區(qū)，全年季節(jié)變化明顯，以溫和、濕潤(rùn)、多雨為主要?dú)夂蛱卣鳌８鶕?jù)張家地氣象站實(shí)測(cè)資料統(tǒng)計(jì)，其多年平均氣溫為14℃，極端最高氣溫36.1℃，極端最低氣溫-152.2.3本流域?qū)儆趤啛釒Ъ撅L(fēng)氣候，四季分明，溫暖濕潤(rùn)，雨量充沛，每年4-7月初冷暖氣流交替頻繁，連續(xù)擇面陰雨天氣，稱梅雨期；其降雨總量占全年的60%左右，7月中旬~10月份，受熱帶風(fēng)暴和臺(tái)風(fēng)的入侵為臺(tái)風(fēng)期。梅雨、臺(tái)風(fēng)雨是該地區(qū)流域發(fā)生洪水的主要原因。10月中旬到次年4月中旬為非汛期，干旱少雨，較少發(fā)生洪水。多年平均降雨1828mm，多年平均降年降水日180天以上。2.3水文基本資料設(shè)計(jì)流域內(nèi)沒有雨量站，流域附近設(shè)有大際、景寧雨量站、橫坪雨量站。大際雨量站（東經(jīng)119o351，北緯27o581）,站點(diǎn)高程1020m。景寧雨量站（東經(jīng)119o381，北緯27o581），站點(diǎn)高程200m。景寧距大際站18.3km，景寧站距橫坪雨量站16.6km。統(tǒng)計(jì)三站多年平均降雨量。景寧站1589.8mm（1963~2000），大際站1880.6mm（1963~2000），橫坪站1801.6mm（1963~2000）。三站緊鄰，且同處小溪右側(cè)，降水氣候因素相近，從年降水量情況來分析，雨量隨海拔高程的增加而增加。各雨量站資料可靠，系列長(zhǎng)。流域內(nèi)沒有水文站，附近流域小溪干流上設(shè)有沙灣水文站（東經(jīng)119o281，北緯27o511）于1957年設(shè)立，集雨面積為1156km2。觀測(cè)項(xiàng)目有降水、水位、流量和泥沙。資料可靠，系列長(zhǎng)。附近飛云江流域支流梧溪上設(shè)有西坑水文站（東經(jīng)119o561，北緯27o511）設(shè)立于1980年，流域面積58.1km2，屬小河站。流域內(nèi)設(shè)有配套雨量站4站，觀測(cè)項(xiàng)目有降水、水位、流量。采用以上二個(gè)水文站作為本流域徑流分析計(jì)算的參證站。2.4徑流本設(shè)計(jì)流域徑流由降水補(bǔ)給，隨著降水的年際變化不斷出現(xiàn)豐、平、枯交替，由于沒有實(shí)測(cè)徑流資料，所以通過降水徑流關(guān)系，移用西坑水文站的降水~徑流~蒸發(fā)關(guān)系來推求徑流。2.4.1流域面雨量計(jì)算本流域沒有雨量站，對(duì)流域鄰近雨量站分析發(fā)現(xiàn)，雨量隨海拔高程的增加而增加。各雨量站直接關(guān)系來分析，橫坪站是景寧站的1.145倍，大際站是景寧站的1.195倍。因此采用景寧站降雨資料的1.15倍為本流域設(shè)計(jì)面雨量。降雨資料系列產(chǎn)用1963-2000年。經(jīng)降水分析，求得多年平均降水量為1828mm。又根據(jù)《浙江省景寧畬族自治縣水資源調(diào)查與水利區(qū)劃》用回歸計(jì)算結(jié)果分析，一般高程升高100米，氣溫降低0.6℃，降水量增加29.5mm，求得多年平均降水量為1885mm。因此在本設(shè)計(jì)階段采用景寧站的1.15倍為本流域的設(shè)計(jì)面雨量是合理的。流域月年降水資料見表2-1流域月年降水量表年份1月2月3月4月5月6月7月8月9月10月11月12月年19630.840.186.1156.6255.1246.9103.6205.2217.410.680.733.71436.81964129.5103.260.5139.7257.6320.9126.4110.3100.4109.71.75.61465.4196521.698.688.3218.6160.9390.5148.6332.550.358.3137.879.61785.5196668.275.8149.3244.0151.3322.8109.6106.3259.858.945.369.31660.6196717.895.6160.2173.8302.3204.9108.355.126.912.977.532.01267.3196846.369.0128.2248.7180.0499.2299.6111.6144.878.319.354.41879.41969123.9163.6155.0165.7388.4353.5149.5152.7333.019.746.09.82060.8197072.268.8263.7206.3288.8385.6196.4154.7186.3141.044.0102.62110.4197135.942.949.5103.7186.2339.880.292.3413.759.012.084.11499.1197210.8170.151.5127.5197.0275.1275.8272.150.558.839.087.41615.5197371.162.6126.5272.3524.1252.3184.656.1254.2180.617.50.02001.7197497.692.175.099.8246.9457.1131.0298.151.8255.888.385.81979.3197560.492.2168.2358.0506.8379.6215.4278.5143.5190.359.564.12516.519767.5107.0152.8159.2187.2393.4211.9167.7135.1134.741.249.01746.61977103.391.880.8236.2267.4385.8136.5168.6211.144.522.462.11810.6197848.363.3220.8175.0115.6441.8109.8134.9140.314.331.514.71510.3197932.765.1206.8204.7176.298.399.0163.469.50.032.910.91159.4198036.7133.2236.0307.6198.7160.5207.2285.851.673.446.68.31745.6198138.068.2270.3348.0181.9121.8194.2108.0118.782.394.619.01645.0198217.3145.5182.9151.5154.2360.9356.0148.874.9165.5174.819.11951.2198388.9102.6127.5429.1351.9394.2317.2257.0113.573.61.251.22307.8198474.164.4201.4245.4322.2256.9105.1204.7175.172.650.662.71835.2198551.2194.9173.860.5196.3245.295.5346.5255.814.849.224.71708.3198611.376.0214.6225.4178.6115.660.796.7164.6134.492.613.31383.8198724.477.2163.8301.0259.9211.5141.793.4275.4177.3206.04.11935.6198868.5214.7173.596.8273.0243.989.0172.7371.015.310.228.91757.71989148.698.292.1214.8379.8352.8338.298.0184.123.671.263.92065.41990134.9140.473.5199.6241.8292.158.1472.1506.138.9105.011.62274.1199179.661.3209.3250.6263.2277.074.1120.8166.364.731.241.11639.11992108.9180.2314.3119.1230.5291.8249.7596.2245.429.610.454.42430.3199373.681.1132.3179.6410.9294.2332.821.2146.645.581.515.11814.4199422.9147.4168.8270.1198.6365.2238.5206.8121.193.73.8181.82018.8199575.870.0260.5342.1269.2480.692.896.1124.951.312.316.31892.0199656.448.2285.0122.7144.2198.7196.1254.666.832.341.79.41456.1199736.783.6185.2187.1183.1348.2324.2272.8110.222.0216.096.72065.61998217.4127.7229.9102.5253.2711.388.433.691.474.468.842.82041.3199952.126.0288.9232.8294.7143.1454.6211.172.1140.113.73.01932.12000114.197.4121.2252.862.0620.3210.5331.316.7121.779.642.62070.0平均65.298.4166.5208.7248.4321.9181.9191.8164.278.359.443.61828.32.4.2月、年徑流計(jì)算2.4.2.1證站選擇與降雨~徑流~蒸發(fā)本設(shè)計(jì)流域徑流均來自降水補(bǔ)給，由于沒有實(shí)測(cè)徑流資料，所以移用附近流域飛云江的西坑水文站為參證站。通過求得流域降水量，移用參證站降水~徑流~蒸發(fā)關(guān)系來推求設(shè)計(jì)徑流。西坑站流域面積為58.1km2，多年平均降雨量1974.2mm，多年平均徑流1222.8mm，徑流系數(shù)0.619。兩流域的分水嶺均在1000m左右，植被、土壤等下墊面條件相似；人類活動(dòng)的影響較小，故選用西坑流域?yàn)閺搅饔?jì)算參證流域。用蒸發(fā)量作為參數(shù)。西坑站月降水與月徑流的關(guān)系如下：（A）1~2月，10~12月R=3.5+0.826P0.876*E-0.095（B）3~9月R=3.5+1.034*P1.331*E-0.537式中：R——月徑流深（mm）P——月降水量（mm）E——代表站的月蒸發(fā)量（mm）2.4.2.2移用西坑站的降水~蒸發(fā)~徑流關(guān)系到設(shè)計(jì)流域，采用流域附近的湖坪頭月蒸發(fā)資料作參數(shù)，求出設(shè)計(jì)流域的長(zhǎng)系列月徑流成果，見表2-2，并根據(jù)集水面積轉(zhuǎn)換成月、年平均流量，見表2-3。表2-2流域月年徑流深表年份1月2月3月4月5月6月7月8月9月10月11月12月年19636.716.046.988.9181.7149.941.797.9118.66.928.114.5797.8196493.860.332.980.3197.5278.848.949.139.353.36.24.7945.119659.772.453.9194.390.4341.162.9190.818.621.766.229.61151.7196625.855.1102.3198.478.6238.545.738.9150.921.817.726.2999.919679.363.8136.8135.7260.3130.045.415.28.37.428.013.7853.9196818.636.594.0185.9130.1465.1196.247.971.226.79.421.31302.8196986.1135.5130.1118.0290.5297.972.070.8211.99.218.06.51446.6197037.225.8241.1192.8246.9334.3102.567.4107.980.817.655.61509.9197115.016.924.955.7121.8224.026.435.0320.321.46.329.7897.419725.9121.122.981.1121.7169.2166.9170.319.520.115.748.8963.3197336.540.887.7210.6489.9188.9103.822.2161.6105.98.61.21457.7197445.152.741.250.7166.2368.558.4180.819.9147.740.531.01202.7197522.961.2136.4311.8488.4274.0110.5172.866.6125.122.824.61817.219766.072.6125.6120.8122.8337.9120.370.065.165.217.019.61142.8197771.244.242.9178.9204.5330.159.581.8128.617.610.223.51193.0197819.232.3160.5128.965.4362.441.267.474.88.013.08.0980.9197914.324.4184.2144.0114.847.438.181.328.32.013.96.4698.9198014.896.5223.7271.7128.281.4105.2185.120.224.817.55.51174.7198116.126.0261.9358.5105.160.9102.045.867.728.233.79.01114.819828.5100.5143.392.681.4296.6228.271.033.6100.279.89.81245.6198361.367.0100.0394.3269.0274.4180.1134.554.625.60.219.71580.8198438.426.4163.0198.3236.4154.441.2105.9100.925.719.323.91133.9198520.6157.5141.028.3122.2176.136.2231.9160.37.618.811.31111.619866.827.8177.4209.386.655.422.037.586.572.732.06.1820.3198711.227.4117.6222.7184.1128.166.035.2174.7123.5140.43.61234.6198825.4167.1143.049.7223.0149.126.781.1288.48.15.712.51179.61989120.056.348.5169.5317.8253.8235.842.8115.410.825.323.71419.71990110.494.143.4139.0155.2190.217.8348.1487.215.335.06.21642.1199150.322.9180.6178.4156.0164.024.848.290.322.913.216.7968.4199278.6132.5260.772.6150.9209.8132.5478.7160.09.36.821.51713.7199337.429.292.5133.6357.1252.3222.98.171.717.428.18.11258.3199411.2108.0152.1202.2101.6258.2113.0111.962.531.54.2142.21298.8199539.326.2221.9367.5192.3408.438.940.253.918.76.57.21421.0199631.819.1242.671.974.3111.598.4157.428.713.516.75.5871.5199715.130.5149.9127.297.8243.7256.8213.560.310.3156.154.01415.11998178.686.5177.948.2158.5618.536.810.741.425.224.917.61424.7199920.711.5253.0166.2227.990.3361.9124.427.343.07.55.21338.9200074.559.975.9101.323.0586.6102.3206.57.349.330.117.01333.7平均1212.2表2-3壩址斷面月年流量表年份1月2月3月4月5月6月7月8月9月10月11月12月年平均19630.0150.0430.1140.2210.4360.3720.1010.2370.2950.0150.0710.0340.16319640.2270.1600.0800.2000.4760.6940.1170.1170.0980.1290.0150.0120.19419650.0250.1940.1290.4820.2180.8480.1510.4610.0460.0520.1660.0710.23719660.0610.1470.2460.4950.1900.5930.1110.0920.3750.0520.0430.0650.20619670.0220.1690.3290.3380.6270.3230.1110.0370.0220.0180.0710.0340.17519680.0460.0980.2270.4640.3131.1580.4730.1170.1780.0650.0250.0520.26719690.2090.3620.3130.2950.7000.7400.1720.1720.5280.0220.0460.0150.29819700.0890.0680.5810.4790.5960.8320.2460.1630.2670.1940.0430.1350.30719710.0370.0460.0610.1380.2920.5560.0650.0830.7990.0520.0150.0710.18419720.0150.3230.0550.2030.2920.4210.4020.4120.0490.0490.0400.1170.19719730.0890.1080.2120.5251.1790.4700.2490.0520.4020.2550.0220.0030.29819740.1080.1410.0980.1260.3990.9180.1410.4360.0490.3560.1010.0740.24619750.0550.1630.3290.7771.1760.6820.2670.4150.1660.3010.0550.0580.37219760.0150.1940.3010.3010.2950.8420.2890.1690.1630.1570.0430.0460.23319770.1720.1170.1040.4450.4910.8200.1440.1970.3190.0430.0250.0550.24619780.0460.0860.3870.3190.1570.9030.0980.1630.1870.0180.0340.0180.20319790.0340.0650.4420.3590.2760.1170.0920.1970.0710.0060.0340.0150.14119800.0370.2580.5380.6760.3100.2030.2550.4450.0490.0580.0430.0120.24019810.0400.0710.6300.8910.2520.1510.2460.1110.1690.0680.0830.0220.22719820.0220.2670.3440.2300.1970.7370.5500.1720.0830.2430.2000.0250.25519830.1470.1780.2400.9800.6480.6820.4330.3230.1350.0610.0000.0460.32319840.0920.0710.3930.4950.5680.3840.0980.2550.2520.0610.0490.0580.23019850.0490.4210.3410.0710.2950.4390.0860.5590.3990.0180.0460.0280.23019860.0150.0740.4270.5220.2090.1380.0520.0890.2150.1750.0800.0150.16919870.0280.0740.2830.5530.4420.3190.1600.0860.4360.2980.3500.0090.25219880.0610.4450.3440.1230.5380.3720.0650.1970.7190.0180.0150.0310.24319890.2890.1510.1170.4210.7650.6330.5680.1040.2860.0280.0610.0580.28919900.2670.2520.1040.3470.3750.4730.0430.8391.2130.0370.0860.0150.33819910.1200.0610.4360.4450.3750.4090.0580.1170.2240.0550.0340.0400.19719920.1900.3530.6270.1810.3620.5220.3191.1520.3990.0220.0150.0520.35019930.0890.0770.2240.3320.8600.6270.5380.0180.1780.0430.0710.0180.25519940.0280.2890.3660.5040.2460.6420.2730.2700.1570.0770.0090.3410.26719950.0950.0710.5340.9150.4641.0170.0920.0980.1350.0460.0150.0180.29219960.0770.0520.5840.1780.1780.2760.2370.3780.0710.0340.0430.0120.17819970.0370.0800.3620.3160.2370.6050.6170.5130.1510.0250.3870.1290.28919980.4300.2300.4270.1200.3811.5390.0890.0250.1040.0610.0610.0430.29219990.0490.0310.6080.4150.5500.2240.8720.3010.0680.1040.0180.0120.27020000.1780.1600.1810.2520.0551.4590.2460.4980.0180.1200.0740.0400.273均值0.0950.1630.3190.3990.4330.6080.2400.2640.2490.0890.0680.0490.2492.4.2.3經(jīng)統(tǒng)計(jì)計(jì)算，流域多年平均流量0.249m3/s，流域多年平均徑流深為1212mm。多年平均降雨量1828mm。多年平均徑流系數(shù)為0.663。多年平均入庫(kù)流量為781.869萬m3對(duì)照《浙江省水資源》，本設(shè)計(jì)流域多年平均降水、多年平均徑流深符合地區(qū)規(guī)律。由設(shè)計(jì)流域年平均流量累積平均值過程來看，累積平均值在30年以上就比較穩(wěn)定，所以采用1963-2000共計(jì)38年的長(zhǎng)系列應(yīng)具有較好的代表性。2.4.3代表年根據(jù)1963-2000年徑流系列，進(jìn)行頻率分析計(jì)算，采用皮爾遜曲線進(jìn)行適線，得蒲洋一級(jí)水電站設(shè)計(jì)年徑流成果見表2-4。表2-4。七里電站設(shè)計(jì)年徑流成果見表壩址均值CvCs/Cv各頻率（%）設(shè)計(jì)值（m3/s）1015508590七里水庫(kù)0.2490.2420.3280.3110.2440.1880.176設(shè)計(jì)代表年的確定：按電站設(shè)計(jì)要求，選定豐、平、枯年份進(jìn)行電能計(jì)算。相應(yīng)頻率豐水年為10%，設(shè)計(jì)流量為0.328m3/s，平水年為50%，設(shè)計(jì)流量為0.244m3/s，枯水年為90%，設(shè)計(jì)流量為0.176m3/s。按頻率計(jì)算結(jié)果，在水利年月年流量表中挑選相對(duì)應(yīng)的典型年份。豐水年10%1973年平水年50%1972年枯水年10%1979年電站設(shè)計(jì)年徑流各月平均流量表見表2-5表2-5七里水電站設(shè)計(jì)年徑流各月平均流量表代表年年別集雨面積Q年代表年縮放系數(shù)1月2月3月4月5月6月7月8月9月10月11月12月1973代表年6.450.2981.1010.0890.1080.2120.5251.1790.470.2490.0520.4020.2550.0220.003豐水年設(shè)計(jì)年0.3280.0980.1190.2330.5781.2980.5170.2740.0570.4420.2810.0240.0031972代表年0.1971.2390.0150.3230.0550.2030.2920.4210.4020.4120.0490.0490.040.117平水年設(shè)計(jì)年0.2440.0190.4000.0680.2510.3620.5210.4980.5100.0610.0610.0500.1451979代表年0.1411.2480.0340.0650.4420.3590.2760.1170.0920.1970.0710.0060.0340.015枯水年設(shè)計(jì)年0.1760.0420.0810.5520.4480.3450.1460.1150.2460.0890.0070.0420.019由上表可得設(shè)計(jì)年的月平均流量，然后根據(jù)設(shè)計(jì)年的逐月平均流量與西坑站相應(yīng)典型年的逐月平均流量的比值求得各相應(yīng)的逐日平均流量。計(jì)算電站各代表年的逐日平均流量表見表2-6、表2-7、表2-8。2-6七里水庫(kù)豐水年（P=10%）逐日流量表月日一二三四五六七八九十十一十二10.0330.3970.2220.1780.4730.5500.3930.1090.2440.1060.0250.01520.0470.6990.4110.1350.3500.4840.2180.1060.1670.0870.0250.01130.0440.3240.3020.1200.4011.7990.2220.0870.1380.0840.0250.01140.0510.2110.6340.1060.2800.5530.1820.0800.1090.0690.0220.01150.2150.1420.3530.0950.2660.3680.1600.0730.0910.0580.0220.01160.1860.1310.2480.0870.7970.2150.1600.0690.0800.0510.0220.01170.1710.1020.1710.0910.4510.1710.1460.0690.0730.0470.0220.01180.7650.0840.1380.0910.3130.1460.1420.0620.0690.0440.0220.01190.3750.0690.1270.1490.2440.1750.1380.0620.0620.0400.0220.011100.3750.0660.1381.0010.4011.0160.1310.0580.0580.0400.0220.011110.2840.1060.1425.0503.0263.4260.2180.0580.0580.0360.0180.011120.3640.0910.3681.1940.8080.7941.1470.0840.1060.0360.0180.011130.2260.0730.2480.6810.5790.5931.3760.0690.5970.0360.0180.011140.1600.0620.1890.4480.3571.5803.4770.0620.3170.0330.0180.011150.1200.0550.2221.0560.2690.9210.8080.0580.2150.0330.0180.011160.0950.0620.2481.3650.3641.6600.5170.0510.1890.0330.0180.011170.0800.1820.1861.1720.2441.5040.2800.0470.1350.0330.0150.015180.0690.1310.1490.8700.1930.6590.2990.0470.1130.0330.0150.015190.0620.1170.1751.0050.1600.5130.3280.0730.0910.0330.0150.015200.0580.3130.3641.3440.1421.5770.2440.0730.0760.0400.0150.022210.0550.2150.2620.6950.1600.7030.1930.2260.0690.1860.0150.171220.0510.2620.2690.8010.1600.4510.1600.4550.0620.0950.0150.025230.0470.3060.2990.4730.1970.4700.1380.1820.0580.0730.0150.022240.0470.5460.2950.3710.1600.3200.1240.1970.0690.0510.0150.018250.0440.5320.4150.2660.1420.2480.1131.2930.2440.0400.0150.015260.0400.3020.2840.2110.1240.2040.1093.6370.1530.0360.0150.015270.0400.2770.2260.1780.1090.1750.1170.7900.1130.0330.0150.011280.0440.2840.4110.1930.1020.2880.1090.4480.0840.0290.0150.025290.0870.0000.3310.6260.1242.1150.0980.1860.0690.0290.0150.200300.0730.0000.3170.6260.3790.5900.0950.1460.0660.0250.0150.273310.0870.0000.2330.0001.7590.0000.0910.1780.0000.0250.0000.102合計(jì)4.4026.1428.38220.67713.54124.26711.9429.1283.9831.5980.5281.121Q月0.1420.2180.2690.6880.4370.8080.3860.2950.1310.0510.0180.0362-7七里水庫(kù)平水年（P=50%）逐日流量表月日一二三四五六七八九十十一十二10.0140.0110.0690.3770.1270.1630.6660.1410.0470.0620.0870.36920.0140.0110.0400.4490.1090.2280.5070.1010.0470.0540.1920.19230.0140.0110.0330.9920.1090.1700.2900.0910.0540.0511.7960.15940.0250.0070.0250.4530.1160.1340.2030.0760.0510.0470.5830.12750.0250.0070.0220.9310.2280.1120.1560.0690.0540.0470.3620.11260.0220.0070.0220.9420.6370.0980.1270.0620.1200.0540.4380.09870.0180.0070.0331.4380.5030.1010.1090.0580.0800.1520.2900.09180.0140.0070.0330.6840.3510.2750.0980.0540.0690.3660.2030.08390.0140.0070.0580.5250.3260.2970.0910.0510.1410.3770.1480.076100.0140.0070.1480.3980.2210.1880.0830.0471.6550.4240.1200.072110.0140.0070.2031.7270.1700.1410.0800.04710.6471.0610.1010.069120.0180.0110.1201.0970.1410.1090.0940.0472.3720.3950.1050.065130.0180.0330.1160.6230.1630.0910.0910.0431.0570.2570.2640.065140.0140.0250.2820.5980.2140.1300.1300.0400.2720.1590.1850.062150.0140.0180.6810.3260.2030.7820.1010.0690.1700.1200.1410.058160.0110.0180.8290.2460.6120.5180.0870.4560.1270.0980.1520.058170.0110.0140.3550.1920.3150.2930.0800.1700.1010.0830.4380.054180.0140.0110.2250.1630.2250.1920.0720.3110.0870.0720.4060.054190.0400.0110.2210.1410.1630.1450.0651.3220.0720.0910.2790.051200.0330.0180.4160.1300.1340.1810.0620.4240.0690.0870.1920.047210.0250.0360.2390.1740.1380.1700.0580.2720.0650.0720.1560.047220.0220.0510.2140.5580.1700.5290.0540.1590.0800.0690.2640.043230.0220.0470.5580.3040.3260.6770.0540.1850.0720.0800.2680.043240.0290.0830.3040.2210.2030.5790.1200.1270.0650.1090.1920.040250.0250.0470.4130.2030.1560.3150.3080.0980.0830.4600.1450.040260.0220.0470.2500.6450.1270.2140.1480.0800.4091.8430.1160.040270.0140.2320.2030.3480.2750.1590.1960.0690.1740.5250.1520.040280.0140.0980.4420.2501.4880.1300.9380.0620.1270.3260.9380.062290.0140.0000.5210.1810.5360.1410.4640.0580.0870.1741.9450.054300.0110.0000.2900.1450.3330.5320.2750.0540.0690.1300.6340.047310.0110.0000.2280.0000.1990.0000.1700.0510.0000.1050.0000.043合計(jì)0.5580.8917.59715.4599.0177.7895.9684.88918.5167.94511.2882.455Q月0.0180.0330.2460.5140.2900.2610.1920.1590.6190.2570.3770.0802-8七里水庫(kù)枯水年（P=90%）逐日流量表月日一二三四五六七八九十十一十二10.0750.0870.1020.0530.2070.5540.1241.1280.0530.0260.0720.01920.1130.0720.1060.0450.1430.2790.1130.4560.0490.0260.0570.01530.0720.0640.3210.0410.1170.1920.1130.7920.0450.2450.0530.01540.0490.0600.2190.0380.2490.1510.1430.3580.0450.2380.0450.01550.0340.0570.2110.0382.0060.1240.1280.5240.0410.2450.0450.01560.0260.0530.2190.0380.6900.1090.1130.2640.0380.0380.0380.01570.0260.0490.2340.0450.3920.0980.1020.1890.0380.0450.0380.01180.0230.0450.1730.0490.2110.0870.0910.1510.0380.1550.0340.01190.0190.0530.1320.1400.1660.1550.0870.3210.0340.2220.0340.011100.0190.1210.1090.1770.3511.1500.0830.1890.0410.1090.0340.011110.0150.0910.0911.0970.7430.3390.0870.2980.1240.0750.0340.011120.0490.0720.0790.3510.3540.6490.2300.7990.0720.0600.0300.011130.5920.0600.0830.2900.2451.1310.1400.3620.0570.0530.0300.011141.0940.0490.1890.1620.1700.4490.1130.2490.0450.1430.0260.011150.3880.0450.1320.1170.1360.3920.0910.1700.0380.6830.0260.011160.2450.0450.1060.0870.1130.2300.0790.1320.0450.3170.0260.011170.1400.0640.0870.0720.0980.3320.0720.1090.0410.1960.2450.011180.0980.1810.0720.0600.0981.9500.0640.0980.0380.1240.0230.011190.0750.1700.0640.0530.1772.0740.0600.0910.1170.0870.0230.011200.0600.8070.0680.0490.2983.7670.0640.1280.8450.0720.0230.011210.0680.3320.0640.0450.1774.3220.1210.1020.2000.0570.0230.011220.2900.3580.0570.0450.1363.2170.0910.0870.1320.0530.0230.008230.8940.7810.0600.1020.1060.8820.0750.0790.0640.0980.0190.008240.4711.3950.1240.2560.0910.6150.0640.0750.0530.1770.0190.008250.2720.5920.0940.2110.1090.3050.0570.0680.0450.1320.0190.008260.1920.3580.0750.4750.2980.2340.0530.0640.0380.1730.0190.008270.3130.2110.0600.5690.1960.1850.0570.0600.0340.1730.0190.008280.2870.1550.0570.6830.3620.1620.0530.0680.0300.1320.0190.008290.1920.1210.0720.3963.6050.1550.0680.0600.0300.1550.0190.008300.1400.0000.0720.3323.1110.1400.3320.0600.0300.1130.0190.008310.1060.0000.0600.0001.4900.0000.3090.0570.0000.0870.0000.008合計(jì)6.4266.5513.5796.10616.64224.4183.3687.5882.4974.5071.1240.362Q月0.2070.2260.1170.2040.5360.8150.1090.2450.0830.1470.0380.011景寧縣七里水電站更新改造工程初步設(shè)計(jì)第2章2.5設(shè)計(jì)洪水本工程的水庫(kù)與電站已運(yùn)行四十一年，沒有記載洪水過壩和由于洪水位過高造成電站不能發(fā)電，因此洪水計(jì)算只是對(duì)現(xiàn)狀進(jìn)行校核。（1）設(shè)計(jì)暴雨由于本流域內(nèi)無雨量站，根據(jù)浙江省水文勘測(cè)局2003年出版的《浙江省短歷時(shí)暴雨》，查圖得浣溪年最大10min、1h、6h的暴雨均值、Cv值和Cs/Cv定倍比，繼而求得設(shè)計(jì)頻率的設(shè)計(jì)暴雨，見表2-11。表2-11設(shè)計(jì)暴雨成果表歷時(shí)HCvCs/CvHp(P＝％)0.5123.335102010min180.33.537.134.531.829.828.225.222.11h42.50.403.5107.698.188.581.375.565.254.56h850.453.5236.9214.0191.0173.8159.9135.9111.0（2）暴雨衰減指數(shù)根據(jù)《浙江省短歷時(shí)暴雨》，暴雨衰減指數(shù)、各歷時(shí)總暴雨量計(jì)算公式如下：當(dāng)在10～60min之間：，當(dāng)在1～6h之間：，（3）產(chǎn)流計(jì)算凈雨量按初損后損法扣損，24小時(shí)后損按每小時(shí)1.0mm扣損計(jì)算產(chǎn)流。（4）匯流計(jì)算匯流計(jì)算采用浙江省推理公式。浙江省推理公式為：——①＝——②式中：——某時(shí)段洪峰流量（m3/s）；——某時(shí)段凈雨量（mm）；——匯流時(shí)間（h）；——匯流參數(shù)；——水庫(kù)集水面積（km2）；——干流長(zhǎng)度（km）；——干流坡度。匯流參數(shù)與流域的幾何特征和植被條件有關(guān)，本流域植被條件一般，采用浙江省水電勘測(cè)設(shè)計(jì)院的Ⅲ類下墊面公式計(jì)算：，將①、②兩式聯(lián)立試算得τ、。相應(yīng)各頻率設(shè)計(jì)洪水成果見表2-10。表2-10設(shè)計(jì)洪水成果表控制斷面Qm,P=%0.5123.3351020壩址167.69150.22132.73119.83109.4991.6673.39廠址169.70151.84134.03120.89110.3592.1673.61（5）設(shè)計(jì)洪水位根據(jù)工程等級(jí)劃分，本工程為五等水電樞紐建筑物。設(shè)計(jì)標(biāo)準(zhǔn)攔河壩、輸水系統(tǒng)、廠房、升壓站等均為5級(jí)建筑物。本工程攔河壩采用開敞式溢洪道，堰長(zhǎng)20m，洪水位采用堰流公式計(jì)算。Q=ε——側(cè)收縮系數(shù)，取0.95σs——淹沒系數(shù)m——流量系數(shù)，取0.45B——側(cè)堰溢流長(zhǎng)度廠房前方河道寬15米，平均河床坡降7%，洪水位采用明渠均勻流公式計(jì)算。Q=W——過水?dāng)嗝娣eC——謝才系數(shù)C=n——糙率R——水力半徑i——坡降表2-10各建筑物防洪標(biāo)準(zhǔn)及洪水位建筑物防洪標(biāo)準(zhǔn)洪峰流量洪水深洪水位攔河壩校核洪水位P=0.5%167.692.70358.90設(shè)計(jì)洪水位P=3.33%119.832.16358.36廠房校核洪水位P=2%134.031.17226.17設(shè)計(jì)洪水位P=3.33%120.891.10226.10景寧縣七里水電站更新改造工程初步設(shè)計(jì)第3章3、工程地質(zhì)3.1區(qū)域地質(zhì)本區(qū)域系構(gòu)造剝蝕中山區(qū)，地層較為簡(jiǎn)單，由第四系松散覆蓋層和侏羅系地層組成，巖性以熔結(jié)凝灰?guī)r為主，局部夾流紋質(zhì)熔結(jié)凝灰?guī)r、凝灰?guī)r等。區(qū)內(nèi)地質(zhì)構(gòu)造不甚復(fù)雜，小型斷裂構(gòu)造和節(jié)理裂隙較為發(fā)育。根據(jù)《中國(guó)地震動(dòng)參數(shù)區(qū)劃圖》（GB18306-2001），設(shè)防水準(zhǔn)為50年超越概率10%的地震動(dòng)參數(shù)為：地震動(dòng)峰值加速度為0.05g（對(duì)應(yīng)地震基本烈度為Ⅵ度）；地震動(dòng)反應(yīng)譜特征周期為0.35s（按2區(qū)中硬場(chǎng)地考慮）。3.2廠址及壓力管線地質(zhì)廠址位于七里電站座落的河流七里坑出口附近，位于溪流右岸，該處地面高程230m左右，且地勢(shì)平緩，有省道通至。廠址處第四系覆蓋層不厚，約達(dá)1～2m。從周圍裸露的基巖呈現(xiàn)，下伏巖體為侏羅系巖層，巖體堅(jiān)