中文摘要：

提出用有限元法反算滑带土抗剪强度指标的新方法，并应用于受地下水和库水位影响的复杂条件下某古滑坡体的强度指标反算。为便于比较，基于传统反算法的基本原理，采用重度替代法建立了相应条件下包括传递系数法在内的滑带土综合抗剪强度指标反算的理论公式。实例计算结果表明，有限元反算法克服了传统的极限平衡理论反算法的缺点，所得结果更加合理、可靠。

英文摘要：

A new method which applies finite element method to back - analyze the indexes of shear strength of soil in slip zone was put forward. And it was applied to an old landslide under the influence of groundwater and water level of the reservoir. Based on the principle of traditional back - analysis method and the corresponding conditions, back - analysis theoretic formulas of the composite indexes of shear strength of soils in slip zone in- cluding transfer coefficient method were established by using weight density substitution method. The engineering example shows that the finite element back - analysis method can overcome the disadvantages of the traditional back -analysis methods based on limit equilibrium theory, and its results are more reasonable and reliable.