含软弱夹层顺层陡坡失稳机制及治理措施分析

Analysis on Instability Mechanism and Treatment Measures of Bedding Steep Slope with Weak Interlayer

摘要:

含软弱夹层的顺层陡坡率岩质边坡的失稳机制分析及治理是公路工程中的难点问题，针对某高速公路中岩质路堑边坡滑坡，采用有限元方法对边坡滑坡的过程进行反演、基于强度折减理论对该滑坡的治理措施及稳定性进行了分析。结果表明:边坡开挖产生的陡坡率引起卸荷拉张裂隙发育，进而导致前缘岩体崩塌是滑坡诱发阶段，后缘岩体沿顺层软弱夹层滑动是滑坡的发展阶段；滑坡治理设计的卸载、坡脚锚固及前缘反压等措施有效，可为类似含软弱夹层的顺层陡坡率滑坡治理提供参考。

Abstract:

The instability mechanism analysis and treatment design of bedding steep rock slope with weak interlayer are the difficult problems in highway engineering. Aiming at the rock cutting slope landslide of an expressway, the finite element method is used to inverse the process of slope landslide, and the treatment measures and stability of the landslide are analyzed based on the strength reduction theory. The results show that the development of unloading tension cracks caused by steep slope rate produced by the slop excavation so as to lead to the collapse of leading edge rock mass is the induced stage of landslide, and the sliding of trailing rock mass along the bedding weak interlayer is the development stage of landslide. The measures of unloading, toe anchoring and leading edge back pressure in the treatment design of landslide are effective, which can provide reference for the treatment of similar bedding steep slope landslide with weak interlayer.