古(gu)(gu)洞口(kou)(kou)(Ⅰ級)水利水電(dian)工(gong)(gong)程位于湖北(bei)省興(xing)山(shan)(shan)縣境(jing)內,壩址在長江支流(liu)香溪河(he)上游古(gu)(gu)夫河(he)段的(de)古(gu)(gu)洞口(kou)(kou)峽(xia)谷出口(kou)(kou)處(chu),下(xia)距興(xing)山(shan)(shan)縣新縣城古(gu)(gu)夫鎮(zhen)2.5公(gong)里,距縣城高陽鎮(zhen)18.5公(gong)里,為古(gu)(gu)夫河(he)流(liu)域水電(dian)開發的(de)近期骨干工(gong)(gong)程。
古洞(dong)口工程(cheng)(cheng)泄(xie)洪兼放空洞(dong)位(wei)于大壩左(zuo)岸(an),圓(yuan)塔式進水口的進口檢修閘(zha)室(shi)底板高程(cheng)(cheng)270.0米,弧形閘(zha)門位(wei)于隧洞(dong)中部,隧洞(dong)全長421米,均(jun)采用(yong)鋼筋砼襯(chen)砌,上游有(you)壓段(duan)(duan)長183米,襯(chen)厚(hou)0.6米,由(you)兩段(duan)(duan)方(fang)圓(yuan)漸(jian)變段(duan)(duan)與檢修塔和工作閘(zha)室(shi)相接(jie)。下游無壓段(duan)(duan)長175米,出(chu)口采用(yong)斜(xie)切坎挑(tiao)流消能(neng)。要(yao)求(qiu)(qiu)泄(xie)洪洞(dong)鋼筋砼施工必須保證質量,滿足(zu)抗(kang)沖(chong)、抗(kang)滲功能(neng)的要(yao)求(qiu)(qiu),做到澆(jiao)筑密實、表面平整(zheng)光滑。
古(gu)洞口工(gong)程為Ⅱ等(deng)大(2)型(xing)工(gong)程,主要(yao)由攔河壩、泄洪(hong)建(jian)筑(zhu)物、引水系統、廠(chang)房及開(kai)關站組成。壩址處河道峽(xia)窄,兩岸(an)巖坡陡竣,河床(chuang)覆蓋層較深(shen)。且河道自峽(xia)谷(gu)出口處急(ji)轉向右,右岸(an)下(xia)游地勢開(kai)闊,交通方便。根(gen)據壩址地形、地質(zhi)特點、及樞紐布(bu)置(zhi)要(yao)求,泄洪(hong)建(jian)筑(zhu)物(即溢洪(hong)道和(he)泄洪(hong)兼放空隧(sui)洞)布(bu)置(zhi)在左(zuo)岸(an),引水系統及電站廠(chang)房布(bu)置(zhi)在右岸(an)。
1、泄洪兼放空隧洞
泄洪兼(jian)放空(kong)隧洞位(wei)于大壩(ba)左岸,由進水口(kou)、有壓段、工作閘室(shi)、無壓段及末端挑流(liu)鼻坎組成,全長421米,進水口(kou)底板高程(cheng)為270米,校核洪水位(wei)時最大泄量1250立方米/秒。
1987年(nian)(nian)(nian)興(xing)山(shan)(shan)(shan)縣(xian)(xian)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)(dian)局委(wei)托中(zhong)南勘測設(she)(she)(she)計(ji)(ji)研(yan)(yan)究院(yuan)宜昌分院(yuan),按照(zhao)國(guo)家基(ji)本建(jian)設(she)(she)(she)程(cheng)(cheng)(cheng)序進行(xing)(xing)(xing)古(gu)夫(fu)河流域查(cha)勘及其(qi)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)(dian)開(kai)發規(gui)劃,1988年(nian)(nian)(nian)上半年(nian)(nian)(nian)完成《古(gu)洞口(kou)(Ⅰ、Ⅱ級)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)(dian)樞紐(niu)工(gong)程(cheng)(cheng)(cheng)可行(xing)(xing)(xing)性研(yan)(yan)究報(bao)(bao)告(gao)》,同(tong)年(nian)(nian)(nian)12月通過湖北(bei)省(sheng)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)廳會同(tong)省(sheng)計(ji)(ji)委(wei)工(gong)程(cheng)(cheng)(cheng)咨詢(xun)公司對"可研(yan)(yan)報(bao)(bao)告(gao)"進行(xing)(xing)(xing)了(le)(le)(le)(le)審(shen)查(cha)和評估。1989年(nian)(nian)(nian)8月9日,湖北(bei)省(sheng)計(ji)(ji)劃委(wei)員(yuan)會下達了(le)(le)(le)(le)《關(guan)于(yu)興(xing)山(shan)(shan)(shan)縣(xian)(xian)古(gu)洞口(kou)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)(dian)站(zhan)(zhan)(zhan)項目建(jian)議書(shu)的批復(fu)(fu)》。1990年(nian)(nian)(nian)5月原(yuan)能源部(bu)、水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)部(bu)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)(dian)規(gui)劃設(she)(she)(she)計(ji)(ji)總(zong)院(yuan)又(you)對該(gai)報(bao)(bao)告(gao)進行(xing)(xing)(xing)了(le)(le)(le)(le)復(fu)(fu)審(shen),同(tong)意(yi)該(gai)報(bao)(bao)告(gao)中(zhong)提出(chu)的主要(yao)結論以(yi)工(gong)程(cheng)(cheng)(cheng)設(she)(she)(she)計(ji)(ji)方案(an)及省(sheng)計(ji)(ji)委(wei)、水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)廳評估與審(shen)查(cha)意(yi)見(jian)。中(zhong)南院(yuan)宜昌分院(yuan)于(yu)1990年(nian)(nian)(nian)10月開(kai)始進行(xing)(xing)(xing)該(gai)工(gong)程(cheng)(cheng)(cheng)的初(chu)(chu)步(bu)(bu)設(she)(she)(she)計(ji)(ji)工(gong)作,1991年(nian)(nian)(nian)10月提交了(le)(le)(le)(le)初(chu)(chu)步(bu)(bu)設(she)(she)(she)計(ji)(ji)報(bao)(bao)告(gao)。1991年(nian)(nian)(nian)12月12日,水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)部(bu)下達了(le)(le)(le)(le)《關(guan)于(yu)湖北(bei)省(sheng)興(xing)山(shan)(shan)(shan)縣(xian)(xian)古(gu)洞口(kou)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)(dian)站(zhan)(zhan)(zhan)(Ⅰ級)設(she)(she)(she)計(ji)(ji)任務書(shu)的批復(fu)(fu)》。1992年(nian)(nian)(nian)3月通過了(le)(le)(le)(le)由原(yuan)能源部(bu)、水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)部(bu)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)(dian)規(gui)劃設(she)(she)(she)計(ji)(ji)總(zong)院(yuan)和湖北(bei)省(sheng)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)廳聯合主持的審(shen)查(cha),審(shen)查(cha)同(tong)意(yi)初(chu)(chu)步(bu)(bu)設(she)(she)(she)計(ji)(ji)報(bao)(bao)告(gao)提出(chu)的樞紐(niu)總(zong)體布置方案(an)。同(tong)年(nian)(nian)(nian)7月水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)部(bu)以(yi)(1992)43號(hao)文(即《關(guan)于(yu)湖北(bei)興(xing)山(shan)(shan)(shan)古(gu)洞口(kou)(Ⅰ級)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)(dian)工(gong)程(cheng)(cheng)(cheng)初(chu)(chu)步(bu)(bu)設(she)(she)(she)計(ji)(ji)報(bao)(bao)告(gao)的批復(fu)(fu)》)批準了(le)(le)(le)(le)該(gai)工(gong)程(cheng)(cheng)(cheng)初(chu)(chu)步(bu)(bu)設(she)(she)(she)計(ji)(ji)報(bao)(bao)告(gao)。1992年(nian)(nian)(nian)12月29日湖北(bei)省(sheng)計(ji)(ji)劃委(wei)員(yuan)會下達了(le)(le)(le)(le)《關(guan)于(yu)轉發省(sheng)政府批準興(xing)山(shan)(shan)(shan)縣(xian)(xian)古(gu)洞口(kou)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)(dian)站(zhan)(zhan)(zhan)工(gong)程(cheng)(cheng)(cheng)一九(jiu)九(jiu)二年(nian)(nian)(nian)新開(kai)工(gong)的建(jian)設(she)(she)(she)通知》。1994年(nian)(nian)(nian)7月根據興(xing)山(shan)(shan)(shan)工(gong)農業生產對電(dian)(dian)(dian)(dian)(dian)(dian)力的需(xu)要(yao),特(te)別(bie)是縣(xian)(xian)電(dian)(dian)(dian)(dian)(dian)(dian)網對調峰容量的需(xu)要(yao),提出(chu)《古(gu)洞口(kou)(Ⅰ級)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)(dian)工(gong)程(cheng)(cheng)(cheng)電(dian)(dian)(dian)(dian)(dian)(dian)站(zhan)(zhan)(zhan)增容論證報(bao)(bao)告(gao)》。1996年(nian)(nian)(nian)11月由水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)部(bu)、水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)電(dian)(dian)(dian)(dian)(dian)(dian)規(gui)劃設(she)(she)(she)計(ji)(ji)總(zong)院(yuan)的工(gong)程(cheng)(cheng)(cheng)設(she)(she)(she)計(ji)(ji)進行(xing)(xing)(xing)了(le)(le)(le)(le)復(fu)(fu)審(shen),同(tong)意(yi)電(dian)(dian)(dian)(dian)(dian)(dian)站(zhan)(zhan)(zhan)裝(zhuang)機容量36兆(zhao)(zhao)瓦,增至45兆(zhao)(zhao)瓦,水(shui)(shui)(shui)(shui)(shui)(shui)(shui)庫大壩由2000年(nian)(nian)(nian)一遇洪(hong)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)校(xiao)核提高到5000年(nian)(nian)(nian)一遇洪(hong)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)校(xiao)核。1997年(nian)(nian)(nian)3月水(shui)(shui)(shui)(shui)(shui)(shui)(shui)利(li)(li)部(bu)以(yi)水(shui)(shui)(shui)(shui)(shui)(shui)(shui)規(gui)設(she)(she)(she)(1997)4號(hao)文對審(shen)核意(yi)見(jian)予以(yi)了(le)(le)(le)(le)批復(fu)(fu),并(bing)提出(chu)了(le)(le)(le)(le)明確的審(shen)核意(yi)見(jian)。
古洞口工(gong)程于1993年3月(yue)1日(ri)正式開(kai)工(gong),1999年9月(yue)9日(ri)首(shou)臺機組(zu)(zu)投(tou)(tou)產發電(dian)。2000年9月(yue)8日(ri)第(di)二臺機組(zu)(zu)投(tou)(tou)產發電(dian),其中(zhong)泄(xie)洪兼放空隧洞施工(gong)情況如下:
泄(xie)洪洞(dong)開(kai)挖(wa)工(gong)程于1997年(nian)(nian)(nian)2月(yue)10日(ri)(ri)開(kai)工(gong),1997年(nian)(nian)(nian)6月(yue)16日(ri)(ri)全洞(dong)貫通。檢(jian)修塔、有壓(ya)段(duan)(duan)、工(gong)作(zuo)閘(zha)室段(duan)(duan)砼(tong)(tong)于1998年(nian)(nian)(nian)5月(yue)3日(ri)(ri)開(kai)工(gong),于1999年(nian)(nian)(nian)5月(yue)11日(ri)(ri)澆筑結(jie)(jie)束。事故檢(jian)修門于1998年(nian)(nian)(nian)11月(yue)開(kai)工(gong),2000年(nian)(nian)(nian)7月(yue)安裝結(jie)(jie)束。工(gong)作(zuo)弧門于1998年(nian)(nian)(nian)11月(yue)30日(ri)(ri)開(kai)工(gong),1999年(nian)(nian)(nian)5月(yue)20日(ri)(ri)安裝結(jie)(jie)束。無壓(ya)段(duan)(duan)砼(tong)(tong)于2003年(nian)(nian)(nian)12月(yue)1日(ri)(ri)開(kai)工(gong),2004年(nian)(nian)(nian)5月(yue)4日(ri)(ri)施(shi)工(gong)結(jie)(jie)束。挑流鼻坎段(duan)(duan)砼(tong)(tong)于2000年(nian)(nian)(nian)4月(yue)5日(ri)(ri)開(kai)倉澆筑至2000年(nian)(nian)(nian)6月(yue)3日(ri)(ri)竣(jun)工(gong)。回填、固結(jie)(jie)灌漿施(shi)工(gong)于1999年(nian)(nian)(nian)元(yuan)月(yue)15日(ri)(ri)施(shi)工(gong),1999年(nian)(nian)(nian)5月(yue)12日(ri)(ri)結(jie)(jie)束。
根據(ju)中華人民共和國(guo)《防洪(hong)標準》GB50201-94規定,古(gu)洞口(Ⅰ級(ji))水(shui)利水(shui)電工程永(yong)久建筑物洪(hong)水(shui)標準為:
混凝土面板堆石壩設計洪水重現期為(wei)100年(nian),校核洪水重現期為(wei)5000年(nian)。
廠房洪水(shui)重現期為100年(nian),校核(he)洪水(shui)重現期為200年(nian)。
混(hun)凝土(tu)面板堆石(shi)壩(ba)按1級建筑物設計,洪水標準按2級建筑物設計;
泄水(shui)建筑(zhu)物按2級建筑(zhu)物設(she)計;
引水建(jian)(jian)筑物及發(fa)電廠房按(an)3級建(jian)(jian)筑物設計。
古洞口(kou)電站(zhan)下距新縣城所在地僅(jin)2.5公里,為了(le)(le)保證下游(you)人員、財產的安全,同時也為自身建筑物的防(fang)洪(hong)(hong)需(xu)要,歷(li)年(nian)(nian)來(lai)設計(ji)單位中南勘測(ce)設計(ji)院(yuan)以文件報(bao)送了(le)(le)《湖北(bei)香(xiang)溪河(he)古洞口(kou)(Ⅰ級)水(shui)利水(shui)電工(gong)(gong)(gong)程(cheng)渡汛意見》。按照(zhao)要求,電業公司(si)每(mei)年(nian)(nian)均(jun)認真組(zu)織(zhi)(zhi)編織(zhi)(zhi)了(le)(le)《古洞口(kou)水(shui)庫渡汛方案的報(bao)告》,并上報(bao)各(ge)(ge)級防(fang)洪(hong)(hong)抗旱(han)指揮部門。在接到報(bao)告批復(fu)后,按照(zhao)批復(fu)文件要求認真落實人員、機械(xie)和(he)物資,并成立了(le)(le)以業主、監理、各(ge)(ge)施(shi)工(gong)(gong)(gong)單位責任人和(he)相關人員組(zu)成的"古洞口(kou)工(gong)(gong)(gong)程(cheng)防(fang)汛指揮部"。電業公司(si)成立了(le)(le)"防(fang)洪(hong)(hong)搶險突擊(ji)隊",各(ge)(ge)施(shi)工(gong)(gong)(gong)單位也成立了(le)(le)相應機構,落實了(le)(le)各(ge)(ge)種措施(shi)。由于工(gong)(gong)(gong)程(cheng)按渡汛要求完成了(le)(le)工(gong)(gong)(gong)程(cheng)項目(mu)施(shi)工(gong)(gong)(gong),各(ge)(ge)方面配合緊密,歷(li)年(nian)(nian)來(lai)沒有發(fa)生工(gong)(gong)(gong)程(cheng)防(fang)洪(hong)(hong)渡汛損失。
該工程由省、市兩級質量監(jian)督(du)機構行使政(zheng)府監(jian)督(du)職(zhi)能。