金沙江虎跳峡河段水电开发中存在的主要地质问题  

Major geologic problems in Hutiaoxia dam zone on Jinsha River

作　　者：夏金梧[1] 周乐群[1] 胡宗云[1] 

机构地区：[1]水利部长江勘测技术研究所

出　　处：《人民长江》1997年第12期29-31,共3页Yangtze River

摘　　要：虎跳峡梯级电站是金沙江中下游河段梯级开发的“龙头”，除其自身具有巨大的效益之外，对下游各梯级也将产生很大的补偿调节作用。研究认为，该河段地形地质条件复杂，处于Ⅷ～Ⅸ度地震烈度区，区域及近场活动断裂发育；各拟选坝址多存在高陡边坡问题，同时也不能完全排除水库及岩溶渗漏的可能性，河床深覆盖层的存在将使坝基防渗处理十分困难。峡谷左岸存在两家人及核桃园两巨型崩滑体，就目前所掌握的资料来看，两崩滑体特别是核桃园崩滑体整体稳定性较好，但下峡口水库蓄水后，仍不能排除存在局部失稳的可能性。峡谷左岸引水隧洞及地下厂房施工将可能遇到的复杂高地应力及边坡稳定问题也是应进一步研究的重要内容。In the cascade development of middle and lower Jinsha River, the Hutiaoxia cascade is a key project, which has not only huge benefits itself, but also very large regulation effect on downstream cascade power stations. In this dam zone, there are complicated topographic and geologic conditions with potential seismic intensity of Ⅷ～Ⅸ degree and developed regional and neardamzone active fractures. In proposed dam sites, there exist such problems as high steep slopes, potential karst passages and very thick burden over river bed. Two massive collapsed bodies are located on the left bank of Hutiaoxia Gorge, and are stable as a whole according to monitored data, however, parts of them could become unstable after impounding of the reservoir formed by the dam located at the exit of Hutiaoxia Gorge. The high insitu stress and slope stability problems which could be encountered during construction of diversion tunnels and underground powerhouse located in the left bank of Hutiaoxia Gorge should also be further studied

关 键 词：区域工程地质 边坡 稳定性 金沙江 水电站 

分 类 号：P642.4[天文地球—工程地质学] TV7[天文地球—地质矿产勘探]