某水利枢纽工程左岸单薄山梁及断层带稳定研究

利用数值模拟分析软件,研究了某水利枢纽工程左岸单薄山梁及断层带稳定性。结果表明:1)增设防渗措施,正常蓄水位情况时库区渗流量为2 795.42 m3/d,F17断层处渗透坡降为0.27,小于临界坡降值,整体上发生渗透破坏可能性较小;2)坝基防渗墙防渗效果相较于左岸山梁防渗帷幕及断层处防渗墙效果更为明显,渗流量变化更大。左岸山梁防渗帷幕及断层处防渗墙加固处理措施,对库区渗流量影响较小,但对断层出渗流坡降具有一定的影响;3)断层沟谷出露位置为渗流出逸位置,左岸山梁冲沟部位会发生较为明显的渗流现象。4)不同条件下边坡安全系数均大于2.35,有一定安全裕度。蓄水后滑移模式1边坡安全系数略有增大,滑移模式2有所降低。研究结果对于工程实际问题的解决具有参考价值。

Stability study of left thin-wall slope and faults of a hydraulic project

Using the numerical simulation software,the stability of the left thin-wall slope and faults of a hydraulic project was studied.Conclusions can be drawn as follows: 1) The discharge of reservoir is 2 795.42 m3/ d when add the seepage facilities after water storage.Seepage gradient in the F17 fault is 0.27,less than critical value and seepage failure will be not happen.2) The effect of the cutoff wall in the dam foundation is larger than in left slope and faults.The influence of the cutoff in the slope and faults to the discharge is small,but obviously to the seepage gradient in the fault.3) The fault in the valley is the diffuse district.4) The stability factor of the slope in the different model are larger than 2.35,the slope is stable.The coefficient of slip model 1 will be increase and slip model 2 decrease after water storage.The results can offer valuable references in solving engineering problems.