基于位移变形分析的边坡滑移面分布规律

Distribution Law of Critical Slip Surface Based on Displacement Deformation Analysis

为了进一步探究土质边坡临界滑移面的分布规律,找到快速定位临界滑面的方法,首先基于强度折减法获得的临界位移场,提出了临界滑面位置点的概念,再从理论上研究临界滑移面在临界位移场中的分布概况,最后对采用不同方法定位临界滑面的6个算例进行分析,对理论分析的结果进行验证,并得出相关结论.分析结果表明:匀质土坡的临界滑面与水平位移等值线重合度较高,临界滑面位置点取值约为0.42,二维与三维情况均可借助临界滑面位置点快速定位临界滑面;具有各向异性特征的分层土坡的临界滑面与等值线的重合度相对较差,可用临界滑面位置点法定性分析临界滑面的分布特征,二维情况可借助临界滑面位置点,用光滑曲线近似表征临界滑面的位置.

In order to have a further study on the distribution law of critical slip surface of soil slope, and find new method which can fast locate critical slip surface, based on the critical displacement field obtained by strength reduction method, the definition of the critical location was given firstly. Then the distribution of the critical location in the critical displacement field was analyzed in theoretical perspective. Finally, 6 examples were analyzed to explain the rationality of results got by theoretical analysis. As to the 6 examples, different methods were used to search for the critical slip surface, some conclusions were got meanwhile. The study show that the critical slip surface and the horizontal displacement contour of the homogeneous soil slope have good coincidence, the value of the critical location is about 0.42. The critical slip surface and horizontal displacement contour of the layered soil slope with anisotropy have bad coincidence relatively, as to the two-dlmension layered soil slope model, the critical slip surface can be got approximately with the value of critical location and smooth curve.