金沙江虎跳峡河段复杂构造环境与高坝建设研究

Complicated tectonic setting of Tiger-leaping Gorge reach of Jinsha River and study of high dam construction

为论证金沙江虎跳峡河段高坝建设的可行性,通过对该河段与其他地区已建高坝河段地质构造环境的比较分析,认为下峡口、上峡口、龙蟠坝址区域稳定性差,工程抗震技术难度最大;石鼓、红岩坝址区域稳定性较差,工程抗震技术难度略小;上江、塔城、其宗坝址区域稳定性好,工程抗震技术难度最小。对于虎跳峡高坝建设方案中的下峡口、上峡口及龙蟠坝址,高坝建设存在较大的地震安全风险,需要大力加强这一领域的研究工作。

A comparative analysis of the river reach and tectonic setting of the high dams already built is conducted to demonstrate the feasibility of constructing high dam in Tiger-leaping Gorge of Jinsha River.The results show that the dam site of downstream gorge,upstream gorge and site of Longpan Dam are instable,which is difficult for anti-seismic design;the site of Shigu and Hongyan Dam are less instable,so the difficulty of anti-seismic design is smaller.The site of Shangjiang,Tacheng and Qizong Dam is stable,and the difficulty for anti-seismic design is the smallest.For the site of the downstream gorge,upstream gorge and Longpan Dam site in the construction scheme of high dam in Tiger-leaping Gorge,there is large seismic safety risk in the construction,so the research on this region needs to be strengthened.