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为了探讨强度折减计算边坡稳定性过程中安全系数和滑动面之间的关系,针对一均质边坡算例,通过理论分析和FLAC3D强度折减法数值计算,分析当黏聚力c和内摩擦角变化时,边坡安全系数和滑动面位置的响应情况,结果表明:(1)边坡的安全系数受到黏聚力或内摩擦角中任一值的影响,而滑动面位置受到两者组成的函数λcφ( λcφ=c /( γhtanφ))的影响;(2)当c为定值时,改变抗剪强度参数c和并不能引起滑动面位置的变化;当c增大时,边坡破坏模式由浅层破坏转变为深层破坏,滑动面越来越缓,其上缘逐渐远离坡顶,滑体的体积增大。
In order to discuss the relationship between the safety factor and the sliding surface in the process of strength reduction calculation, aiming at a homogeneous slope example, through theoretical analysis and numerical calculation of FLAC3D strength reduction method, The results show that: (1) The safety factor of slope is affected by either cohesion or internal friction angle, while the position of sliding surface is affected by both (Λcφ = c / (γhtanφ)); (2) When c is constant, changing the shear strength parameter c and does not cause the change of the sliding surface position; when c increases, the slope The failure mode changes from shallow damage to deep damage, and the sliding surface is getting slower and slower. The upper edge of the failure mode is gradually away from the top of the slope, and the volume of the sliding body increases.