Abstract: Firstly, the error of finite difference method is discussed, and then reasonable mesh density and boundary conditions are pointed out. Secondly, compared with the limit equilibrium method, the dilatancy angle, tensile strength, Poisson's ratio and elastic modulus have some effect on the sensitivity of safety coefficients and the deformation characteristics of the slope. Results of the research show that: the dilatancy angle has the most obvious effect on the safety co efficients of slope; when tensile strength is relatively smaller, it has certa in influence; Poisson's ratio and elastic modulus have no obvious influence on safety coefficients; the dilatancy angle, Poisson's ratio and the elastic modulus are of relatively obvious influence to the slope destruction, but compared with Poisson's ratio, elastic modulus is more apparent; when tensile strength is relatively smaller, it has influence on the slope deformation.

Key words: strength reduction method, safety coefficients, the dilatancy angle, tensile strength, Poisson's ratio, elastic modulus

摘要： 首先探讨了有限差分法自身的误差,提出了合理的网格密度及边界条件;然后,通过与极限平衡法的比较,研 究了剪胀角、抗拉强度、泊松比及弹性模量对边坡安全系数的敏感性以及对边坡变形特征的影响。研究表明:剪胀 角、泊松比和弹性模量对边坡破坏时变形的影响较为明显,但弹性模量相对泊松比更为明显,抗拉强度较小时对边 坡变形有影响。

关键词: 强度折减法, 安全系数, 剪胀角, 抗拉强度, 泊松比, 弹性模量