A slope engineering is analyzed by the finite difference method based on the strength reduction method, and safety factors are obtained under four different failure criterions which are mutations of iterations number, non-convergence of calculation, mutation of maximum displacement and runthrough of plastic zone. Results show that safety factors are slightly different under different criterions. The reliability of safety factors calculated by strength reduction method are verified by limit equilibrium analysis based on Sarma method.%对具体边坡工程进行了基于强度折减法的有限差分分析,得到了迭代步数突变、计算不收敛、位移最大值突变以及塑性区贯通4种边坡破坏判据下的安全系数.结果显示不同破坏判据下的安全系数略有不同.最后通过基于Sarma法的极限平衡分析验证了强度折减法得到的安全系数的可靠性.
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