红层边坡浮托力作用下滑移弯曲破坏机理分析

Analysis of Failure Mechanism of Sliding and Bending of Red Bed Slope under Uplift Force

红层软岩具有独特的工程特性,其顺向边坡发生失稳的案例非常多。本文以岩体弹性变形本构方程为理论基础,推导出红层边坡在降雨条件下发生滑移弯曲破坏的极限承载力、极限坡长和弯曲点位置计算式,以及红层软岩边坡发生滑移弯曲破坏的判据,并结合湖南湘西某大型缓倾顺层滑坡实例对相关结论进行验证。相关结论对今后类似工程的勘察及预加固等具有重要的参考价值。

The red bed soft rock has unique engineering characteristics,and there are many cases of its consequent slope instability.Based on the constitutive equation of elastic deformation of rock mass,this paper deduces the calculation formula of the ultimate bearing capacity,the ultimate slope length and the position of the bending point of the red bed slope under the condition of rainfall,and the criterion of the sliding bending failure of the red bed soft rock slope,and validates the relevant conclusions with the example of a large gently inclined bedding landslide in southern and western Hunan.The relevant conclusions have important reference value for the investigation and pre-reinforcement of similar projects in the future.