中文摘要：

针对滑坡二维反分析方法和利用非常严谨的精确三维方法进行反分析时的不足,提出了基于滑块面积加权平均的滑坡滑动面抗剪强度指标准三维反分析方法,它以国内常用的剩余推力法为基础,以每个二维剖面的面积以及相应剖面最后条块的剩余推力为参数,从滑体整体角度考虑来反分析滑动面抗剪强度指标c、值,此方法能够计算出滑坡体每个剖面的安全系数,相对滑坡二维反分析方法更加符合工程实际情况;相对非常严谨的精确三维方法进行反分析时更加简单明了。最后,用王家寨滑坡检验了此方法的适用性,并与其余的准三维分析方法的反分析结果进行了比较。结果表明,此方法与国外同类方法的计算结果相近,能够很好地考虑滑坡体的三维效应,具有一定的推广应用价值。

英文摘要：

Considering the drawbacks of both 2D and 3D back analysis methods in spite of the accuracy and being dramatically rigorous of the latter one,a quasi-3D back analysis approach for shearing strength index of sliding surface of landslide was developed by applying the slider area weighted average method.Based on the popular residual thrust method,using the area of each 2D profile and the residual thrust of the end slice for the corresponding profile as parameters,a back analysis of values of shearing strength index（c and ）of sliding surface was conducted.This approach is able to compute the safety factor for each profile of landslides,and is of better agreement of engineering practice than 2D back analysis method,also is more concise and simpler than the accurate 3D back analysis method which is relatively precise and rigorous.Finally,the applicability of the approach was verified at Wangjiazhai slope,along with the comparison with results of other quasi-3D back analysis methods.It is found that the results of this approach are close to those of other similar foreign methods.It is qualified to present an excellent consideration of 3D effect of landslides and deserves popularization and application.