引松供水工程总干线地应力测试研究

Study on Ground Stress Test of Main Diversion Line of Water Supply Project from Songhua River

引松供水工程是吉林省规模最大的水利供水工程,输水总干线隧洞段总长约98 km,是国内最长的有压引水隧洞之一,隧洞跨越不同岩性,地层较多,地质条件复杂。采用水压致裂法对现场地应力测试,研究隧洞地应力场特征,得到最大、最小水平主应力量值和水平主应力方向。结果表明,测试区域内地应力属中低应力水平,从地应力角度分析,隧洞轴线选择方向对围岩稳定较为有利。

The Project of Water Supply from Songhua Lake is the largest water conservancy project in Jilin province. The total length of main diversion tunnel is about 98 kin, which is one of the longest pressurized diversion tunnels in China. The tunnel will pass through different lithology layers, so the geological conditions are complex. By using hydrodynamic fracturing method, the ground stress test is carried out to study the characteristics of ground stress field of tunnel, and the maximum and minimum horizontal principal stresses and the direction of horizontal principal stress are obtained. The results show that the ground stress in test area is medium-low level. From the point of view of ground stress, the choice of tunnel axis is more favorable to the stability of surrounding rock.