平顶形边坡开挖剪滑段确定及对坡体稳定性的影响

Determination of shear sliding section and its effect on stability of flathead shaped excavated slope

对公路的平顶形边坡开挖进行了受力分析,提出了确定坡脚剪滑段的方法,指出在剪滑段范围内岩土体的抗剪强度降低,从而导致坡体稳定性下降。实例表明,在考虑剪滑段力学性质差异的情况下,通过极限平衡法搜索的最危险滑动面退化为次危险滑动面,且坡面分阶对坡脚应力集中的消散作用。

Stress analysis of flathead shaped slope in highway excavated slope is conducted with advancing exterminating methods of shear sliding section at the toe of slope, and pointing out that in the range of shear sliding section, depressed shear strength of geotechincal mass will result in knock-down of slope stability. Examples show that with consideration of differences of mechanical properties in shear sliding section, maximum dangerous slide face by method of limit equilibrium will degenerate into vice dangerous slide face; and stepping slope face will dissipate stress concentration at the toe of slope.