改进的重力加载比例法在非均质边坡稳定性分析中的应用

Application of FEM Gravity Increase Method in Stability Analysis of Inhomogeneous Slopes

为了解决强度折减法在非均质黄土边坡稳定性计算中的局限性,采用改进的重力加载比例法研究了山西某非均质黄土边坡的稳定性。首先,运用三轴试验抗剪参数,采用Mohr-Coulomb屈服准则,不相关流动法则,应用有限元分析软件建立数值分析模型,分析了计算得到的水平位移与实测的水平位移,验证了改进的重力加载比例法在该边坡中的适用性。然后,将其计算精度和时效与强度折减法的对比,结果表明:对于该非均质边坡,改进的重力加载比例法计算的安全系数与传统的有限元计算方法得到的安全系数的误差为3%,强度折减法计算结果的误差为7.6%;并且改进的重力加载比例法简化了计算过程,减少了计算过程中人工的干预,使得计算速度更快。

In order to solve the limitation of strength reduction method in the calculation of inhomogeneous slope stability,the FEM gravity increase method based on just changing the gravity is adopted to investigate the stability of a inhomogeneous slope in Shanxi province. Firstly,using the shear parameters of triaxial tests,adopting MohrCoulomb yield criterion and none relevant flow rule,founding a numerical calculation model though a finite element analysis software,which verified the accuracy and feasibility of gravity increase method used in the inhomogeneous slope. Afterward,the calculation accuracy and ageing are compared with strength reduction method. Results show that error of safety coefficient obtained from the finite element calculation of satety factor of FEM gravity increase method and the traditional method is 3%,strength reduction method is 7. 6%; gravity increase method is faster computing and easier calculating procedure than strength reduction method in the inhomogeneous slope.