西藏加查地区某水电站坝址区隐伏断裂研究

Study on Buired Faults at a Hydropower Station in Gyaca Area,Tibet

该水电站坝址区位于Ⅱ、Ⅲ级阶地平台上,被第四系松散沉积物覆盖,为探明下面是否发育有隐伏断层,本文首先研究从区域构造变形规律和坝址区周边基岩断层发育特征出发,结合断层气(氡气和地气)测量技术发现13号测点氡气和地气均出现异常,因此判断该阶地下面发育有一条规模较小的隐伏断层,走向近东西向,倾角较陡,对该处工程稳定性影响不大。也为今后该地区的隐伏断裂研究提供借鉴意义。

The dam area of the hydropower station is located on the Ⅱ and Ⅲ terrace platforms,covered by Quaternary unconsolidated sediments.In order to find out the following development of buried fault,this paper firstly studies from regional tectonic deformation regularities and the developmental features of fault broken zone around the dam area,combination of fault gas（radon gas and geo-gas） measurement technology found No.13 survey station of radon gas and geo-gas are abnormal.It＇s found that there are one small buried fault developing below the terraces,and with nearly E-W trending,dip steeply but have small impact on the stability of engineering nearby.