西南某水电站半坡滑坡抗剪强度参数的确定

Shear Strength Parameters Determination of the Banpo Landslide at a Hydropower Station Site

以半坡滑坡为研究对象,通过该滑坡的工程地质条件和成因机制分析,确定其在地质历史时期曾发生两次失稳破坏。选取具有代表性的滑坡纵剖面,恢复原始地形,根据极限平衡原理,采用slide软件对滑带土的抗剪强度参数进行反演分析。同时,结合室内土工试验,类比周边临近相似工程,综合确定滑带土的抗剪强度参数,计算滑坡在各种工况下的稳定性,可为同类工程抗剪强度参数的确定提供参考。

This paper presents a case history of Banpo landslide analysis for a hydropower station site in Southwest China.The subsurface conditions and the landslide reconnaissance indicate that there two historical slides can be identified at the site.Starting from the laboratory test results,the subsurface soil shear strength parameters of the slided zone were determined by global stability analysis with limit equilibrium method by Slide software on the sliding profiles representing the original topography.Based on the back analyzed soil shear strength parameters,the global stability of the current topography was analyzed under various load combinations and conditions.