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古(gu)洞口(kou)（Ⅰ級）水利(li)水電工程位于湖(hu)北省興山(shan)縣境(jing)內，壩址在長江(jiang)支流(liu)(liu)香溪河(he)(he)上游古(gu)夫河(he)(he)段的古(gu)洞口(kou)峽谷出口(kou)處，下距興山(shan)縣新(xin)縣城古(gu)夫鎮2.5公里(li)，距縣城高陽(yang)鎮18.5公里(li)，為古(gu)夫河(he)(he)流(liu)(liu)域水電開發的近期骨干工程。

古(gu)洞口(kou)工(gong)程(cheng)泄洪兼放(fang)空洞位于大壩(ba)左岸(an)，圓(yuan)塔式進水(shui)口(kou)的進口(kou)檢修閘室底板高程(cheng)270.0米(mi)，弧形閘門位于隧(sui)洞中部(bu)，隧(sui)洞全(quan)長421米(mi)，均采用(yong)(yong)鋼筋(jin)砼襯砌，上游(you)(you)有(you)壓段(duan)長183米(mi)，襯厚0.6米(mi)，由兩段(duan)方圓(yuan)漸變段(duan)與檢修塔和工(gong)作(zuo)閘室相接。下游(you)(you)無壓段(duan)長175米(mi)，出口(kou)采用(yong)(yong)斜切坎挑(tiao)流消能(neng)。要求(qiu)(qiu)泄洪洞鋼筋(jin)砼施工(gong)必須保證質量，滿足抗沖、抗滲功能(neng)的要求(qiu)(qiu)，做到澆筑密實、表面(mian)平整光滑(hua)。

古洞口工程為Ⅱ等大（2）型工程，主要由攔河(he)壩(ba)、泄洪(hong)建筑物(wu)、引水系(xi)統(tong)、廠房(fang)(fang)及開關站組成。壩(ba)址(zhi)處河(he)道(dao)(dao)(dao)峽窄(zhai),兩(liang)岸(an)巖坡陡竣,河(he)床覆(fu)蓋層較深(shen)。且河(he)道(dao)(dao)(dao)自峽谷出口處急轉向(xiang)右，右岸(an)下游(you)地(di)勢開闊，交通方便。根據壩(ba)址(zhi)地(di)形、地(di)質特點、及樞紐布(bu)置(zhi)要求，泄洪(hong)建筑物(wu)（即溢洪(hong)道(dao)(dao)(dao)和泄洪(hong)兼放空隧(sui)洞）布(bu)置(zhi)在左岸(an)，引水系(xi)統(tong)及電站廠房(fang)(fang)布(bu)置(zhi)在右岸(an)。

1、泄洪兼放(fang)空隧洞

泄(xie)洪兼放空(kong)隧(sui)洞位(wei)于(yu)大壩左岸，由進(jin)水(shui)口、有壓段(duan)、工作閘(zha)室、無壓段(duan)及末(mo)端挑流(liu)鼻坎組成(cheng)，全長421米(mi)，進(jin)水(shui)口底板高程為(wei)270米(mi)，校核(he)洪水(shui)位(wei)時最大泄(xie)量(liang)1250立方米(mi)/秒。

1987年(nian)(nian)(nian)(nian)興山(shan)縣水(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)局委(wei)(wei)托中(zhong)南勘測(ce)設(she)(she)計(ji)(ji)(ji)研(yan)究(jiu)院(yuan)宜(yi)昌分院(yuan)，按照國家基本建(jian)設(she)(she)程(cheng)(cheng)(cheng)(cheng)序(xu)進行古(gu)夫河流域查勘及其水(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)開發(fa)規(gui)(gui)劃(hua)，1988年(nian)(nian)(nian)(nian)上半(ban)年(nian)(nian)(nian)(nian)完成《古(gu)洞(dong)(dong)口(kou)（Ⅰ、Ⅱ級）水(shui)(shui)(shui)利(li)(li)(li)(li)水(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)樞(shu)紐(niu)工(gong)程(cheng)(cheng)(cheng)(cheng)可行性研(yan)究(jiu)報(bao)告》，同(tong)(tong)年(nian)(nian)(nian)(nian)12月(yue)(yue)(yue)(yue)通過湖(hu)北(bei)省(sheng)水(shui)(shui)(shui)利(li)(li)(li)(li)廳(ting)會(hui)同(tong)(tong)省(sheng)計(ji)(ji)(ji)委(wei)(wei)工(gong)程(cheng)(cheng)(cheng)(cheng)咨詢公司(si)對"可研(yan)報(bao)告"進行了(le)(le)(le)審(shen)(shen)查和評(ping)估。1989年(nian)(nian)(nian)(nian)8月(yue)(yue)(yue)(yue)9日，湖(hu)北(bei)省(sheng)計(ji)(ji)(ji)劃(hua)委(wei)(wei)員會(hui)下(xia)達(da)了(le)(le)(le)《關于(yu)興山(shan)縣古(gu)洞(dong)(dong)口(kou)水(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)站(zhan)項(xiang)目建(jian)議書的(de)(de)(de)(de)批復(fu)(fu)(fu)》。1990年(nian)(nian)(nian)(nian)5月(yue)(yue)(yue)(yue)原能源部(bu)(bu)、水(shui)(shui)(shui)利(li)(li)(li)(li)部(bu)(bu)水(shui)(shui)(shui)利(li)(li)(li)(li)水(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)規(gui)(gui)劃(hua)設(she)(she)計(ji)(ji)(ji)總院(yuan)又對該報(bao)告進行了(le)(le)(le)復(fu)(fu)(fu)審(shen)(shen)，同(tong)(tong)意(yi)該報(bao)告中(zhong)提(ti)(ti)出的(de)(de)(de)(de)主(zhu)要結論以(yi)(yi)工(gong)程(cheng)(cheng)(cheng)(cheng)設(she)(she)計(ji)(ji)(ji)方(fang)案及省(sheng)計(ji)(ji)(ji)委(wei)(wei)、水(shui)(shui)(shui)利(li)(li)(li)(li)廳(ting)評(ping)估與(yu)審(shen)(shen)查意(yi)見(jian)。中(zhong)南院(yuan)宜(yi)昌分院(yuan)于(yu)1990年(nian)(nian)(nian)(nian)10月(yue)(yue)(yue)(yue)開始進行該工(gong)程(cheng)(cheng)(cheng)(cheng)的(de)(de)(de)(de)初(chu)步(bu)(bu)設(she)(she)計(ji)(ji)(ji)工(gong)作，1991年(nian)(nian)(nian)(nian)10月(yue)(yue)(yue)(yue)提(ti)(ti)交了(le)(le)(le)初(chu)步(bu)(bu)設(she)(she)計(ji)(ji)(ji)報(bao)告。1991年(nian)(nian)(nian)(nian)12月(yue)(yue)(yue)(yue)12日，水(shui)(shui)(shui)利(li)(li)(li)(li)部(bu)(bu)下(xia)達(da)了(le)(le)(le)《關于(yu)湖(hu)北(bei)省(sheng)興山(shan)縣古(gu)洞(dong)(dong)口(kou)水(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)站(zhan)（Ⅰ級）設(she)(she)計(ji)(ji)(ji)任務書的(de)(de)(de)(de)批復(fu)(fu)(fu)》。1992年(nian)(nian)(nian)(nian)3月(yue)(yue)(yue)(yue)通過了(le)(le)(le)由原能源部(bu)(bu)、水(shui)(shui)(shui)利(li)(li)(li)(li)部(bu)(bu)水(shui)(shui)(shui)利(li)(li)(li)(li)水(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)規(gui)(gui)劃(hua)設(she)(she)計(ji)(ji)(ji)總院(yuan)和湖(hu)北(bei)省(sheng)水(shui)(shui)(shui)利(li)(li)(li)(li)廳(ting)聯合主(zhu)持的(de)(de)(de)(de)審(shen)(shen)查，審(shen)(shen)查同(tong)(tong)意(yi)初(chu)步(bu)(bu)設(she)(she)計(ji)(ji)(ji)報(bao)告提(ti)(ti)出的(de)(de)(de)(de)樞(shu)紐(niu)總體布置方(fang)案。同(tong)(tong)年(nian)(nian)(nian)(nian)7月(yue)(yue)(yue)(yue)水(shui)(shui)(shui)利(li)(li)(li)(li)部(bu)(bu)以(yi)(yi)（1992）43號文（即《關于(yu)湖(hu)北(bei)興山(shan)古(gu)洞(dong)(dong)口(kou)（Ⅰ級）水(shui)(shui)(shui)利(li)(li)(li)(li)水(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)工(gong)程(cheng)(cheng)(cheng)(cheng)初(chu)步(bu)(bu)設(she)(she)計(ji)(ji)(ji)報(bao)告的(de)(de)(de)(de)批復(fu)(fu)(fu)》）批準了(le)(le)(le)該工(gong)程(cheng)(cheng)(cheng)(cheng)初(chu)步(bu)(bu)設(she)(she)計(ji)(ji)(ji)報(bao)告。1992年(nian)(nian)(nian)(nian)12月(yue)(yue)(yue)(yue)29日湖(hu)北(bei)省(sheng)計(ji)(ji)(ji)劃(hua)委(wei)(wei)員會(hui)下(xia)達(da)了(le)(le)(le)《關于(yu)轉發(fa)省(sheng)政(zheng)府批準興山(shan)縣古(gu)洞(dong)(dong)口(kou)水(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)站(zhan)工(gong)程(cheng)(cheng)(cheng)(cheng)一九九二年(nian)(nian)(nian)(nian)新(xin)開工(gong)的(de)(de)(de)(de)建(jian)設(she)(she)通知》。1994年(nian)(nian)(nian)(nian)7月(yue)(yue)(yue)(yue)根據興山(shan)工(gong)農(nong)業生(sheng)產對電(dian)(dian)(dian)(dian)(dian)力的(de)(de)(de)(de)需要，特別是(shi)縣電(dian)(dian)(dian)(dian)(dian)網對調峰(feng)容(rong)量的(de)(de)(de)(de)需要，提(ti)(ti)出《古(gu)洞(dong)(dong)口(kou)（Ⅰ級）水(shui)(shui)(shui)利(li)(li)(li)(li)水(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)工(gong)程(cheng)(cheng)(cheng)(cheng)電(dian)(dian)(dian)(dian)(dian)站(zhan)增容(rong)論證報(bao)告》。1996年(nian)(nian)(nian)(nian)11月(yue)(yue)(yue)(yue)由水(shui)(shui)(shui)利(li)(li)(li)(li)部(bu)(bu)、水(shui)(shui)(shui)利(li)(li)(li)(li)水(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)規(gui)(gui)劃(hua)設(she)(she)計(ji)(ji)(ji)總院(yuan)的(de)(de)(de)(de)工(gong)程(cheng)(cheng)(cheng)(cheng)設(she)(she)計(ji)(ji)(ji)進行了(le)(le)(le)復(fu)(fu)(fu)審(shen)(shen)，同(tong)(tong)意(yi)電(dian)(dian)(dian)(dian)(dian)站(zhan)裝機容(rong)量36兆(zhao)瓦，增至45兆(zhao)瓦，水(shui)(shui)(shui)庫大壩由2000年(nian)(nian)(nian)(nian)一遇(yu)洪(hong)水(shui)(shui)(shui)校核提(ti)(ti)高(gao)到5000年(nian)(nian)(nian)(nian)一遇(yu)洪(hong)水(shui)(shui)(shui)校核。1997年(nian)(nian)(nian)(nian)3月(yue)(yue)(yue)(yue)水(shui)(shui)(shui)利(li)(li)(li)(li)部(bu)(bu)以(yi)(yi)水(shui)(shui)(shui)規(gui)(gui)設(she)(she)（1997）4號文對審(shen)(shen)核意(yi)見(jian)予以(yi)(yi)了(le)(le)(le)批復(fu)(fu)(fu)，并提(ti)(ti)出了(le)(le)(le)明(ming)確(que)的(de)(de)(de)(de)審(shen)(shen)核意(yi)見(jian)。

古(gu)洞(dong)(dong)口工(gong)程(cheng)于1993年(nian)3月(yue)1日正(zheng)式開工(gong)，1999年(nian)9月(yue)9日首臺機組投產發(fa)(fa)電。2000年(nian)9月(yue)8日第二(er)臺機組投產發(fa)(fa)電，其中泄洪兼放空隧(sui)洞(dong)(dong)施工(gong)情況如下：

泄洪洞開(kai)(kai)挖工(gong)程(cheng)于1997年(nian)(nian)2月(yue)(yue)(yue)10日(ri)(ri)開(kai)(kai)工(gong)，1997年(nian)(nian)6月(yue)(yue)(yue)16日(ri)(ri)全洞貫通。檢修塔、有壓段、工(gong)作(zuo)閘室段砼于1998年(nian)(nian)5月(yue)(yue)(yue)3日(ri)(ri)開(kai)(kai)工(gong)，于1999年(nian)(nian)5月(yue)(yue)(yue)11日(ri)(ri)澆筑結束(shu)。事故檢修門于1998年(nian)(nian)11月(yue)(yue)(yue)開(kai)(kai)工(gong)，2000年(nian)(nian)7月(yue)(yue)(yue)安裝(zhuang)(zhuang)結束(shu)。工(gong)作(zuo)弧門于1998年(nian)(nian)11月(yue)(yue)(yue)30日(ri)(ri)開(kai)(kai)工(gong)，1999年(nian)(nian)5月(yue)(yue)(yue)20日(ri)(ri)安裝(zhuang)(zhuang)結束(shu)。無壓段砼于2003年(nian)(nian)12月(yue)(yue)(yue)1日(ri)(ri)開(kai)(kai)工(gong)，2004年(nian)(nian)5月(yue)(yue)(yue)4日(ri)(ri)施工(gong)結束(shu)。挑流鼻坎段砼于2000年(nian)(nian)4月(yue)(yue)(yue)5日(ri)(ri)開(kai)(kai)倉澆筑至2000年(nian)(nian)6月(yue)(yue)(yue)3日(ri)(ri)竣工(gong)。回填、固結灌漿施工(gong)于1999年(nian)(nian)元月(yue)(yue)(yue)15日(ri)(ri)施工(gong)，1999年(nian)(nian)5月(yue)(yue)(yue)12日(ri)(ri)結束(shu)。

根據中(zhong)華(hua)人民共和國《防洪標準》GB50201-94規(gui)定，古(gu)洞口(kou)（Ⅰ級(ji)）水(shui)(shui)利(li)水(shui)(shui)電(dian)工程永(yong)久建(jian)筑物洪水(shui)(shui)標準為(wei)：

混凝土面板堆石壩(ba)設計(ji)洪水重現期為100年(nian)，校核洪水重現期為5000年(nian)。

廠(chang)房(fang)洪水重(zhong)現期為(wei)100年，校核洪水重(zhong)現期為(wei)200年。

混凝土面板堆(dui)石壩(ba)按1級建筑(zhu)物設計(ji)，洪水標準按2級建筑(zhu)物設計(ji)；

泄(xie)水建筑(zhu)物按2級建筑(zhu)物設計；

引水建(jian)筑(zhu)物(wu)及(ji)發電廠房按3級建(jian)筑(zhu)物(wu)設計。

古(gu)(gu)洞(dong)口(kou)電站下距新縣城所在地僅(jin)2.5公里，為了(le)保證下游(you)人(ren)員、財(cai)產(chan)的(de)安全，同時也(ye)為自身(shen)建筑物的(de)防洪(hong)(hong)需要(yao)，歷(li)年(nian)來設(she)計(ji)單(dan)位中(zhong)南勘測設(she)計(ji)院(yuan)以文件報(bao)送了(le)《湖北(bei)香溪河古(gu)(gu)洞(dong)口(kou)（Ⅰ級）水(shui)(shui)利水(shui)(shui)電工程渡(du)(du)(du)汛意(yi)見》。按(an)照要(yao)求，電業(ye)公司(si)每年(nian)均(jun)認真(zhen)組織(zhi)編織(zhi)了(le)《古(gu)(gu)洞(dong)口(kou)水(shui)(shui)庫渡(du)(du)(du)汛方(fang)案的(de)報(bao)告》，并上報(bao)各(ge)(ge)級防洪(hong)(hong)抗旱指(zhi)揮部門。在接到報(bao)告批復后(hou)，按(an)照批復文件要(yao)求認真(zhen)落實人(ren)員、機(ji)械(xie)和(he)(he)物資，并成立了(le)以業(ye)主、監理、各(ge)(ge)施(shi)(shi)工單(dan)位責任人(ren)和(he)(he)相(xiang)關人(ren)員組成的(de)"古(gu)(gu)洞(dong)口(kou)工程防汛指(zhi)揮部"。電業(ye)公司(si)成立了(le)"防洪(hong)(hong)搶險(xian)突擊隊"，各(ge)(ge)施(shi)(shi)工單(dan)位也(ye)成立了(le)相(xiang)應機(ji)構，落實了(le)各(ge)(ge)種(zhong)措施(shi)(shi)。由于工程按(an)渡(du)(du)(du)汛要(yao)求完(wan)成了(le)工程項目施(shi)(shi)工，各(ge)(ge)方(fang)面配合緊密，歷(li)年(nian)來沒有發生(sheng)工程防洪(hong)(hong)渡(du)(du)(du)汛損失。

該工程由省(sheng)、市兩級(ji)質量監(jian)督機構行使政府監(jian)督職(zhi)能。