广西全州天湖水电站水压致裂三维地应力测量及其应用

In-Situ 3-Dimensional Stress Measurements by Hydrofracture and its Application in the Design of Tianhu Hydropourer Prosect, Guangxi Zhuang Autonomous Region

一、引言用水压致裂法测量地壳应力的大小和方向,具有其它测量方法不可比拟的优点,不仅操作简单,而且可进行地表以下几百米甚至千米深度的应力测量,直接确定应力值和岩石力学参数等.我们研制的轻便水压致裂应力测量系统已在水电、石油、交通、煤炭等部门得到广泛应用.

This paper discusses in-situ 3-dimensional stress measurements by hydrofracture carried out in three different direction boreholes.Both theory analysis and in-situ measurements at Tianhu proved that the method of 3-dimensional stress measurement by hydrofracture is quite feasible.The results of in-situ 3-dimensional stress measured in exploratory at Tianhu showed that the surrounding rock meets the demand of"the minimum principal criterion"for unlining design,it could be adopted for the prosect;the choose of the pressure tunel orientation is reasonable and the pressure plug should locate between the two measure sites.All of the conclusion had been adopted in the prosect design.The power has been operated more than three years since it’s completed,and it proued that the results of in-situ 3-dimensional stress measurement by hydrofracture is quite reliable and the unlining design is also quite reasonable.