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古(gu)(gu)洞口(kou)（Ⅰ級(ji)）水利水電(dian)工程位(wei)于湖北(bei)省興山(shan)縣境內(nei)，壩址在長江支流(liu)香(xiang)溪河(he)(he)上游(you)古(gu)(gu)夫(fu)河(he)(he)段的古(gu)(gu)洞口(kou)峽谷出口(kou)處，下距興山(shan)縣新縣城(cheng)古(gu)(gu)夫(fu)鎮2.5公里(li)，距縣城(cheng)高陽(yang)鎮18.5公里(li)，為古(gu)(gu)夫(fu)河(he)(he)流(liu)域水電(dian)開(kai)發的近期骨干工程。

古(gu)洞口工(gong)程泄洪兼放空洞位于大壩左岸，圓塔式進水口的(de)進口檢修閘(zha)室底板高程270.0米(mi)(mi)，弧形閘(zha)門位于隧洞中部，隧洞全長421米(mi)(mi)，均采用鋼筋砼襯砌，上游有壓(ya)段(duan)長183米(mi)(mi)，襯厚(hou)0.6米(mi)(mi)，由兩(liang)段(duan)方(fang)圓漸變段(duan)與(yu)檢修塔和工(gong)作閘(zha)室相接。下游無壓(ya)段(duan)長175米(mi)(mi)，出口采用斜(xie)切坎挑流消能。要求泄洪洞鋼筋砼施工(gong)必須保證質量(liang)，滿足抗沖、抗滲功能的(de)要求，做到澆筑密實(shi)、表(biao)面平整光滑。

古(gu)洞(dong)口(kou)工(gong)程為Ⅱ等大（2）型工(gong)程，主要由攔河壩、泄(xie)洪建筑(zhu)物、引水系統(tong)、廠房(fang)及開(kai)關站組成。壩址處河道峽窄,兩岸(an)巖坡陡竣,河床(chuang)覆蓋層較(jiao)深。且河道自(zi)峽谷出(chu)口(kou)處急轉向右，右岸(an)下游(you)地(di)勢開(kai)闊，交通方便。根據(ju)壩址地(di)形、地(di)質(zhi)特點、及樞紐布(bu)置要求，泄(xie)洪建筑(zhu)物（即溢洪道和(he)泄(xie)洪兼放空隧洞(dong)）布(bu)置在左岸(an)，引水系統(tong)及電站廠房(fang)布(bu)置在右岸(an)。

1、泄(xie)洪兼放空隧洞

泄洪(hong)兼放空隧洞位于(yu)大壩左岸，由進水(shui)(shui)口、有壓段、工作閘室、無(wu)壓段及末端(duan)挑流鼻(bi)坎組成，全長421米，進水(shui)(shui)口底(di)板高程為270米，校核洪(hong)水(shui)(shui)位時最大泄量1250立方米/秒。

1987年興(xing)(xing)山(shan)縣水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)局委托(tuo)中(zhong)(zhong)南(nan)勘(kan)測設(she)(she)(she)計(ji)研(yan)究院(yuan)(yuan)宜(yi)昌(chang)(chang)分(fen)院(yuan)(yuan)，按照國家(jia)基本建(jian)(jian)設(she)(she)(she)程(cheng)(cheng)(cheng)序進(jin)(jin)(jin)(jin)行(xing)(xing)古(gu)(gu)夫河流域查勘(kan)及(ji)其水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)開(kai)發規(gui)劃(hua)，1988年上(shang)半年完成《古(gu)(gu)洞口（Ⅰ、Ⅱ級）水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)利水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)樞(shu)紐工(gong)(gong)(gong)(gong)程(cheng)(cheng)(cheng)可行(xing)(xing)性研(yan)究報(bao)告(gao)(gao)》，同(tong)年12月通(tong)過湖(hu)北省(sheng)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)利廳(ting)會同(tong)省(sheng)計(ji)委工(gong)(gong)(gong)(gong)程(cheng)(cheng)(cheng)咨詢(xun)公司(si)對(dui)(dui)"可研(yan)報(bao)告(gao)(gao)"進(jin)(jin)(jin)(jin)行(xing)(xing)了(le)(le)(le)審(shen)查和(he)評(ping)估。1989年8月9日(ri)，湖(hu)北省(sheng)計(ji)劃(hua)委員會下(xia)(xia)達(da)了(le)(le)(le)《關(guan)(guan)(guan)于(yu)興(xing)(xing)山(shan)縣古(gu)(gu)洞口水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)站(zhan)(zhan)項(xiang)目建(jian)(jian)議書的(de)(de)(de)(de)批(pi)復(fu)》。1990年5月原能源部(bu)(bu)、水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)利部(bu)(bu)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)利水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)規(gui)劃(hua)設(she)(she)(she)計(ji)總院(yuan)(yuan)又對(dui)(dui)該(gai)報(bao)告(gao)(gao)進(jin)(jin)(jin)(jin)行(xing)(xing)了(le)(le)(le)復(fu)審(shen)，同(tong)意(yi)(yi)該(gai)報(bao)告(gao)(gao)中(zhong)(zhong)提(ti)(ti)出的(de)(de)(de)(de)主(zhu)要(yao)(yao)結論(lun)以工(gong)(gong)(gong)(gong)程(cheng)(cheng)(cheng)設(she)(she)(she)計(ji)方(fang)案及(ji)省(sheng)計(ji)委、水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)利廳(ting)評(ping)估與審(shen)查意(yi)(yi)見。中(zhong)(zhong)南(nan)院(yuan)(yuan)宜(yi)昌(chang)(chang)分(fen)院(yuan)(yuan)于(yu)1990年10月開(kai)始進(jin)(jin)(jin)(jin)行(xing)(xing)該(gai)工(gong)(gong)(gong)(gong)程(cheng)(cheng)(cheng)的(de)(de)(de)(de)初步設(she)(she)(she)計(ji)工(gong)(gong)(gong)(gong)作，1991年10月提(ti)(ti)交了(le)(le)(le)初步設(she)(she)(she)計(ji)報(bao)告(gao)(gao)。1991年12月12日(ri)，水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)利部(bu)(bu)下(xia)(xia)達(da)了(le)(le)(le)《關(guan)(guan)(guan)于(yu)湖(hu)北省(sheng)興(xing)(xing)山(shan)縣古(gu)(gu)洞口水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)站(zhan)(zhan)（Ⅰ級）設(she)(she)(she)計(ji)任務書的(de)(de)(de)(de)批(pi)復(fu)》。1992年3月通(tong)過了(le)(le)(le)由(you)原能源部(bu)(bu)、水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)利部(bu)(bu)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)利水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)規(gui)劃(hua)設(she)(she)(she)計(ji)總院(yuan)(yuan)和(he)湖(hu)北省(sheng)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)利廳(ting)聯合主(zhu)持(chi)的(de)(de)(de)(de)審(shen)查，審(shen)查同(tong)意(yi)(yi)初步設(she)(she)(she)計(ji)報(bao)告(gao)(gao)提(ti)(ti)出的(de)(de)(de)(de)樞(shu)紐總體布置方(fang)案。同(tong)年7月水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)利部(bu)(bu)以（1992）43號文（即《關(guan)(guan)(guan)于(yu)湖(hu)北興(xing)(xing)山(shan)古(gu)(gu)洞口（Ⅰ級）水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)利水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)工(gong)(gong)(gong)(gong)程(cheng)(cheng)(cheng)初步設(she)(she)(she)計(ji)報(bao)告(gao)(gao)的(de)(de)(de)(de)批(pi)復(fu)》）批(pi)準了(le)(le)(le)該(gai)工(gong)(gong)(gong)(gong)程(cheng)(cheng)(cheng)初步設(she)(she)(she)計(ji)報(bao)告(gao)(gao)。1992年12月29日(ri)湖(hu)北省(sheng)計(ji)劃(hua)委員會下(xia)(xia)達(da)了(le)(le)(le)《關(guan)(guan)(guan)于(yu)轉發省(sheng)政府批(pi)準興(xing)(xing)山(shan)縣古(gu)(gu)洞口水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)站(zhan)(zhan)工(gong)(gong)(gong)(gong)程(cheng)(cheng)(cheng)一(yi)(yi)九(jiu)九(jiu)二年新開(kai)工(gong)(gong)(gong)(gong)的(de)(de)(de)(de)建(jian)(jian)設(she)(she)(she)通(tong)知(zhi)》。1994年7月根據興(xing)(xing)山(shan)工(gong)(gong)(gong)(gong)農業生產對(dui)(dui)電(dian)(dian)(dian)力的(de)(de)(de)(de)需要(yao)(yao)，特(te)別(bie)是(shi)縣電(dian)(dian)(dian)網對(dui)(dui)調峰容(rong)量的(de)(de)(de)(de)需要(yao)(yao)，提(ti)(ti)出《古(gu)(gu)洞口（Ⅰ級）水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)利水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)工(gong)(gong)(gong)(gong)程(cheng)(cheng)(cheng)電(dian)(dian)(dian)站(zhan)(zhan)增容(rong)論(lun)證報(bao)告(gao)(gao)》。1996年11月由(you)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)利部(bu)(bu)、水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)利水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)規(gui)劃(hua)設(she)(she)(she)計(ji)總院(yuan)(yuan)的(de)(de)(de)(de)工(gong)(gong)(gong)(gong)程(cheng)(cheng)(cheng)設(she)(she)(she)計(ji)進(jin)(jin)(jin)(jin)行(xing)(xing)了(le)(le)(le)復(fu)審(shen)，同(tong)意(yi)(yi)電(dian)(dian)(dian)站(zhan)(zhan)裝機(ji)容(rong)量36兆瓦，增至45兆瓦，水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)庫大壩由(you)2000年一(yi)(yi)遇洪(hong)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)校核提(ti)(ti)高到(dao)5000年一(yi)(yi)遇洪(hong)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)校核。1997年3月水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)利部(bu)(bu)以水(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)(shui)規(gui)設(she)(she)(she)（1997）4號文對(dui)(dui)審(shen)核意(yi)(yi)見予以了(le)(le)(le)批(pi)復(fu)，并提(ti)(ti)出了(le)(le)(le)明(ming)確的(de)(de)(de)(de)審(shen)核意(yi)(yi)見。

古洞(dong)口工(gong)程(cheng)于1993年3月(yue)1日正式開(kai)工(gong)，1999年9月(yue)9日首臺機(ji)組投(tou)產發(fa)電(dian)。2000年9月(yue)8日第二臺機(ji)組投(tou)產發(fa)電(dian)，其中泄洪兼放空(kong)隧洞(dong)施工(gong)情(qing)況(kuang)如下(xia)：

泄洪洞(dong)開(kai)(kai)挖工(gong)(gong)(gong)(gong)程于(yu)1997年(nian)(nian)(nian)(nian)2月(yue)(yue)(yue)(yue)(yue)10日開(kai)(kai)工(gong)(gong)(gong)(gong)，1997年(nian)(nian)(nian)(nian)6月(yue)(yue)(yue)(yue)(yue)16日全洞(dong)貫通。檢(jian)修塔、有(you)壓段、工(gong)(gong)(gong)(gong)作閘室段砼于(yu)1998年(nian)(nian)(nian)(nian)5月(yue)(yue)(yue)(yue)(yue)3日開(kai)(kai)工(gong)(gong)(gong)(gong)，于(yu)1999年(nian)(nian)(nian)(nian)5月(yue)(yue)(yue)(yue)(yue)11日澆(jiao)筑結(jie)(jie)(jie)束(shu)(shu)。事(shi)故檢(jian)修門(men)于(yu)1998年(nian)(nian)(nian)(nian)11月(yue)(yue)(yue)(yue)(yue)開(kai)(kai)工(gong)(gong)(gong)(gong)，2000年(nian)(nian)(nian)(nian)7月(yue)(yue)(yue)(yue)(yue)安裝(zhuang)結(jie)(jie)(jie)束(shu)(shu)。工(gong)(gong)(gong)(gong)作弧門(men)于(yu)1998年(nian)(nian)(nian)(nian)11月(yue)(yue)(yue)(yue)(yue)30日開(kai)(kai)工(gong)(gong)(gong)(gong)，1999年(nian)(nian)(nian)(nian)5月(yue)(yue)(yue)(yue)(yue)20日安裝(zhuang)結(jie)(jie)(jie)束(shu)(shu)。無壓段砼于(yu)2003年(nian)(nian)(nian)(nian)12月(yue)(yue)(yue)(yue)(yue)1日開(kai)(kai)工(gong)(gong)(gong)(gong)，2004年(nian)(nian)(nian)(nian)5月(yue)(yue)(yue)(yue)(yue)4日施工(gong)(gong)(gong)(gong)結(jie)(jie)(jie)束(shu)(shu)。挑流鼻(bi)坎段砼于(yu)2000年(nian)(nian)(nian)(nian)4月(yue)(yue)(yue)(yue)(yue)5日開(kai)(kai)倉澆(jiao)筑至2000年(nian)(nian)(nian)(nian)6月(yue)(yue)(yue)(yue)(yue)3日竣工(gong)(gong)(gong)(gong)。回填、固結(jie)(jie)(jie)灌漿施工(gong)(gong)(gong)(gong)于(yu)1999年(nian)(nian)(nian)(nian)元(yuan)月(yue)(yue)(yue)(yue)(yue)15日施工(gong)(gong)(gong)(gong)，1999年(nian)(nian)(nian)(nian)5月(yue)(yue)(yue)(yue)(yue)12日結(jie)(jie)(jie)束(shu)(shu)。

根(gen)據中華人民共和國(guo)《防洪(hong)標準》GB50201-94規定，古洞口(kou)（Ⅰ級）水利水電工程永久(jiu)建(jian)筑物洪(hong)水標準為：

混凝土面(mian)板堆石(shi)壩設計洪水重現(xian)期為100年(nian)，校(xiao)核(he)洪水重現(xian)期為5000年(nian)。

廠房(fang)洪水重現期為(wei)100年(nian)，校核洪水重現期為(wei)200年(nian)。

混凝(ning)土面板堆石壩(ba)按1級建筑物設(she)(she)計(ji)，洪水標(biao)準按2級建筑物設(she)(she)計(ji)；

泄水(shui)建筑(zhu)(zhu)物(wu)按2級建筑(zhu)(zhu)物(wu)設計；

引(yin)水建筑物及發(fa)電(dian)廠(chang)房按3級建筑物設(she)計。

古(gu)洞(dong)(dong)口電站下距新縣城(cheng)所在地僅2.5公(gong)里，為(wei)了(le)(le)(le)保證下游(you)人員、財產(chan)的(de)安全，同時也(ye)(ye)為(wei)自(zi)身建筑物的(de)防(fang)洪需要，歷年來設計(ji)(ji)單(dan)位(wei)中(zhong)南勘測設計(ji)(ji)院以文(wen)件(jian)報(bao)(bao)送了(le)(le)(le)《湖北香溪河古(gu)洞(dong)(dong)口（Ⅰ級）水(shui)利(li)水(shui)電工(gong)(gong)程(cheng)(cheng)渡汛(xun)(xun)(xun)意見》。按(an)照(zhao)(zhao)要求(qiu)，電業(ye)(ye)公(gong)司每年均認真組織編織了(le)(le)(le)《古(gu)洞(dong)(dong)口水(shui)庫渡汛(xun)(xun)(xun)方案的(de)報(bao)(bao)告》，并上(shang)報(bao)(bao)各(ge)級防(fang)洪抗(kang)旱指揮(hui)部(bu)門。在接(jie)到報(bao)(bao)告批復后(hou)，按(an)照(zhao)(zhao)批復文(wen)件(jian)要求(qiu)認真落(luo)(luo)實人員、機(ji)械和物資，并成(cheng)(cheng)立了(le)(le)(le)以業(ye)(ye)主、監理、各(ge)施(shi)工(gong)(gong)單(dan)位(wei)責任人和相(xiang)(xiang)關人員組成(cheng)(cheng)的(de)"古(gu)洞(dong)(dong)口工(gong)(gong)程(cheng)(cheng)防(fang)汛(xun)(xun)(xun)指揮(hui)部(bu)"。電業(ye)(ye)公(gong)司成(cheng)(cheng)立了(le)(le)(le)"防(fang)洪搶(qiang)險突擊隊(dui)"，各(ge)施(shi)工(gong)(gong)單(dan)位(wei)也(ye)(ye)成(cheng)(cheng)立了(le)(le)(le)相(xiang)(xiang)應機(ji)構(gou)，落(luo)(luo)實了(le)(le)(le)各(ge)種措施(shi)。由于工(gong)(gong)程(cheng)(cheng)按(an)渡汛(xun)(xun)(xun)要求(qiu)完成(cheng)(cheng)了(le)(le)(le)工(gong)(gong)程(cheng)(cheng)項(xiang)目施(shi)工(gong)(gong)，各(ge)方面配合緊密，歷年來沒有發生工(gong)(gong)程(cheng)(cheng)防(fang)洪渡汛(xun)(xun)(xun)損(sun)失。

該工程由(you)省、市兩級質(zhi)量監督機構行(xing)使政府監督職能。