小天都气垫调压室洞壁围岩原地承载力的水力劈裂测试

The hydraulic splitting test for the bearing capacity of surrounding rock of the air-cushion surge tank in Xiaotiandu hydropower station

本文给出了该气垫调压室勘探平洞的水力劈裂测试结果。分析表明 ,随着洞深与埋深的增大 ,愈向山体内部岩体结构的完整性及其自身的承载能力愈趋增强。在 0 + 72 9m的第五测点 ,所有测段岩体抗劈裂强度的平均值为 7 4MPa。因此 ,该点具备修建气垫调压室要求的岩体力学条件 ,该点附近的洞段是布置气垫调压室较理想的位置。

The measurement results of the hydraulic splitting test for the bearing capacity of surrounding rock of the air-cushion surge tank are presented in this paper.Its analysis indicates that the rock structure integrality and its bearing capacity are better as the tunnel is deeper into the mountain, especially at the 5th site 0+729m,the average value of resisting split is 74MPa,and it reaches the rock mechanics qualification and provides an ideal position for building the air-cushion surge tank.