中文摘要：

垃圾填埋场沿底坡和背坡衬里界面发生平移破坏的工程实例较多，也有破坏面沿垃圾体内部和底坡的组合破坏形式，相应的计算分析方法有待完善。对组合破坏，根据垃圾体内部破坏面为库仑主动破坏面和组合破坏面上各点安全系数相同的假设，由刚体极限平衡条件，建立组合破坏的稳定计算方法。运用双楔体和组合破坏稳定分析方法对算例和Kettleman Hills填埋场工程实例进行计算分析。结果表明：双楔体法计算得到的最危险平移滑动破坏安全系数大于组合破坏最小安全系数；最危险破坏面是组合破坏面；对Kettlcman Hills填埋场，组合滑动面也是可能的滑动破坏面。由此可见，组合破坏是垃圾填埋场可能的破坏形式之一，在进行垃圾填埋体滑动稳定分析计算时应进行组合破坏形式的计算分析。

英文摘要：

The translational failure along liner system at bottom and back slope often happened in municipal waste landfill. The composite failure through the body of waste filling and bottom slope is other failure mode. The relative calculation method of slope stability in landfill for composite failure mode must be modified based on the current stability analysis method. For composite failure, it is assumed that failure surface in waste filling is in Coulomb＇s active situation and safety factor is identical at all points on the composite failure surface. On the limit equilibrium of rigid body, a new stability analysis method for composite failure is presented. The stability of a slope and Kettleman Hills＇s landfill slope are calculated by the new method and two wedges method. The calculation results show that safety factor obtained by two wedges method for dangerous translational failure is higher than that by the above new method. The most dangerous slide failure surface is composite failure surface. For the Kettleman Hills＇s landfill, the composite failure surface is possible sliding failure surface. It can be found that the composite failure is one of the possible failure modes. The composite failure mode must be considered for slope stability safety analysis of landfill.