某软弱基座型斜坡的稳定性分析

Analysis on Stability of a Slope with Soft Base

以仁义河特大桥南桥台斜坡为例,通过对斜坡底部的石膏角砾岩的力学特性和流变特征分析,认为该斜坡为一可溶性软弱基座型斜坡,组成斜坡基座的石膏角砾岩是一种具有流变特性的软岩。采用2Dσ软件对斜坡体的稳定性进行了二维有限元分析,认为该斜坡只可能发生局部的失稳破坏,不会发生大面积的滑坡、崩塌或座滑,不会影响大桥的安全,从而为解决该类特殊斜坡工程问题提供参考。

The slope lies on the south abutment of the great Renyi river bridge.After taking the physical and mechanical property tests and creep tests to the rocks in the slope,we think that the slope is a slope with soluble rocks and soft base and that the gypsum breccia in the bed of the slope is a soft rock with rheidity.Stability of the slope is analyzed by 2D-σ software.The result shows that the slope can only be destroyed partly and cannot be in large range.So it has no effect on the bridge and this will be helpful to solve the engineering problem of the special slope.