工程地质学报
工程地質學報
공정지질학보
2009年
5期
590-596
,共7页
刘建友%伍法权%卢丙清%刘彤%梁宁%薛继洪%衣晓强
劉建友%伍法權%盧丙清%劉彤%樑寧%薛繼洪%衣曉彊
류건우%오법권%로병청%류동%량저%설계홍%의효강
锦屏二级水电站%皮带输送隧洞%地质问题%处理措施
錦屏二級水電站%皮帶輸送隧洞%地質問題%處理措施
금병이급수전참%피대수송수동%지질문제%처리조시
Jinping Ⅱ hydroelectric power station%Rock tunneling%Rock instability%Rock failure%Treatment measures
重力坍塌、脆性破坏和楔形掉块是锦屏二级水电站皮带输送隧洞施工中存在的主要地质问题.重力坍塌主要存在于Ⅳ类和Ⅴ类松散破碎岩体中,围岩在重力作用下发生坍塌;脆性破坏主要存在于Ⅰ类和Ⅱ类完整坚硬岩体中,围岩在高地应力作用下发生脆性破裂;楔形掉块主要存在于Ⅱ类、Ⅲ类和Ⅳ类较完整岩体中,围岩在结构面切割组合下形成楔形块体并在重力作用下向临空面发生掉落.根据不同的破坏模式,分别采取了不同的开挖支护措施:重力坍塌段采取了超前锚喷、短进尺、强支护;脆性破坏采取了监测预报、光面爆破、超前钻孔;楔形掉块采取了喷锚支护.
重力坍塌、脆性破壞和楔形掉塊是錦屏二級水電站皮帶輸送隧洞施工中存在的主要地質問題.重力坍塌主要存在于Ⅳ類和Ⅴ類鬆散破碎巖體中,圍巖在重力作用下髮生坍塌;脆性破壞主要存在于Ⅰ類和Ⅱ類完整堅硬巖體中,圍巖在高地應力作用下髮生脆性破裂;楔形掉塊主要存在于Ⅱ類、Ⅲ類和Ⅳ類較完整巖體中,圍巖在結構麵切割組閤下形成楔形塊體併在重力作用下嚮臨空麵髮生掉落.根據不同的破壞模式,分彆採取瞭不同的開挖支護措施:重力坍塌段採取瞭超前錨噴、短進呎、彊支護;脆性破壞採取瞭鑑測預報、光麵爆破、超前鑽孔;楔形掉塊採取瞭噴錨支護.
중력담탑、취성파배화설형도괴시금병이급수전참피대수송수동시공중존재적주요지질문제.중력담탑주요존재우Ⅳ류화Ⅴ류송산파쇄암체중,위암재중력작용하발생담탑;취성파배주요존재우Ⅰ류화Ⅱ류완정견경암체중,위암재고지응력작용하발생취성파렬;설형도괴주요존재우Ⅱ류、Ⅲ류화Ⅳ류교완정암체중,위암재결구면절할조합하형성설형괴체병재중력작용하향림공면발생도락.근거불동적파배모식,분별채취료불동적개알지호조시:중력담탑단채취료초전묘분、단진척、강지호;취성파배채취료감측예보、광면폭파、초전찬공;설형도괴채취료분묘지호.
Gravitational collapse, brittle failure and wedge falling are key geological problems that occurred during the construction of a rock tunnel at Jinping Ⅱ hydroelectric power station. The gravitational collapse mainly occurred in the Ⅳ and Ⅴ rock mass. The brittle failure mainly occurred in the Ⅰ and Ⅱ rock mass. The wedges falling mainly occurred in the Ⅱ ,Ⅲ and Ⅳ rock mass. Three failure modes are common in the rock tunnel. They would bring about severe danger for workers and construction equipments , and greatly affect the construction schedule. This paper analyzes the geological causes of the threefailure modes and puts forward corresponding excavating and supporting measures. The proposed measures obtained favorable engineering results.