腾龙桥二级水电站导流隧洞工程地质比选

Engineering Geological Comparison of Tenglongqiao Ⅱ Hydropower Station Diversion Tunnel

通过腾龙桥二级水电站枢纽区工程地质勘察,区内工程地质条件极为复杂。龙江大断裂紧靠右岸通过,受其影响,岩体风化强烈,较破碎;左岸为顺向坡,大坝下游发育规模较大滑坡体,山坡不稳定。左、右岸导流隧洞选择极为困难,直接关系工程的安全和决策。通过大量的工程地质勘探、分析,比较了两岸导流隧洞的有利因素、缺点及风险和需要采取的工程处理措施,综合考虑工程地质条件推荐了右岸导流隧洞。

According to the investigation of Tenglongqiao II hydropower station,it shows that the engineering geological conditions in this junction area is very complex. Longjiang fault closing to the right bank,the rock mass has been strong weathered,and rock has been broken under the influence of the station. Besides,on the left along the slope and the dam downstream developed a large scale of landslide,the slope is instable. Choosing the left or right bank diversion tunnel is very difficult,which directly related to the safety of engineering and decision making. Through a lot of engineering geological prospecting and analysis,comparing the diversion tunnel of the favorable factors,disadvantages and risks on both sides,the engineering measures need to be taken. Considering all of these engineering geological conditions,the right bank diversion tunnel has been recommended.