软硬岩互层边坡稳定性的敏感性因素分析

Analysis of Sensitivity Factors to Stability of Inter-beddings of Soft and Hard Rock Slope

针对沪蓉国道主干线湖北宜昌至巴东高速公路上的顺层软硬岩互层边坡破坏特征,建立了顺层软硬岩互层边坡稳定性的分析模型.分析了层面强度、岩层厚度、岩层倾角、水力作用等各项因素对边坡稳定性的影响,探索软硬岩互层边坡稳定性的一些规律.结果表明:敏感度由大到小为:层面倾角>层面内摩擦角>层面厚度>边坡中水力作用>层面粘聚力,即层面倾角和软弱岩层面的强度参数(内摩擦角)对边坡稳定性起主要控制作用,岩层厚度对边坡的稳定性也有明显的影响,物理模型试验更加进一步验证了文中所得的各因素对软硬岩互层边坡稳定性影响的规律.

An example taken from Yiba highway′s slope with inter-beddings of soft and hard rock,and the simulation model for analyzing the stability of inter-beddings of soft and hard rock slope is established.The stability sensibility of the inter-beddings of soft and hard rock slope to the influence factors,such as strength of the surface,thickness,inclination of rock stratum and hydraulic pressure,is analyzed.The results show that：sensitivity descending is inclination of rock stratum internal frictionthicknesshydraulic pressurecohesive force,that is the inclination of rock stratum and the strength parameters of the structural surface play a main control role to the stability of the inter-beddings of soft and hard rock slope;and the thickness has obvious influence on the stability of rock slopes.Physical model test further also demonstrates the rationality of stability regularity with interbeddings of soft and hard rock slope.The regularity can provide foundation for inter-beddings of soft and hard rock slope′s disposal technologies.