设垃圾坝卫生填埋场平移破坏的统一分析模型

 针对设垃圾坝卫生填埋场沿填埋场侧壁、底部及垃圾坝背部和沿填埋场侧壁、底部及垃圾坝底部这2种平移破坏模式，提出平移破坏的统一分析模型。该模型将滑移体分为主动、中间和被动3个楔体，通过对各个楔体的极限平衡分析，建立方程计算填埋场平移破坏安全系数。通过算例分析平均安全系数和真实安全系数的最大相对误差以及楔体间安全系数和整体安全系数的关系，并与未设垃圾坝和设垃圾坝，但只考虑单一破坏模式分析模型的计算结果进行比较，说明统一分析模型的正确性、可行性与兼容性。该模型既能考虑垃圾坝断面形状、垃圾坝背部与垃圾体作用力方向和复合衬垫系统界面的黏聚力等因素对平移破坏的影响，克服了有些模型对这些条件的限制；也能用于不设垃圾坝填埋场平移破坏分析。根据设垃圾坝填埋场平移破坏分析结果，还可对垃圾坝断面进行优化设计。

CONSISTENT MODEL OF TRANSLATIONAL FAILURE ANALYSIS OF SANITARY LANDFILLS WITH REFUSE DAM

Consistent model to analyze the translational failure of sanitary landfills with refuse dam along the lateral phase and the base of landfill as well as the back or base of refuse dam is developed. The failure body is divided into active，middle and passive wedges. An equation is established to calculate the safety factors through limit equilibrium analysis of every wedge. According to the maximum relative differences between average and true safety factors；and the relationship between the safety factors of wedges and whole fills are analyzed. The safety factors are also compared with the results of the model of two wedges for landfills without refuse dam and the model of one failure style only for landfills with refuse dam. It is shown that the consistent model is corrective，suitable and comprehensive. The model can consider the influence of the section of refuse dam，the force direction between the back of wall and the waste fill as well as the cohesion along the interfaces of combined liner system，which overcomes the limited conditions of some models. The model can also be used to analyze the translational failure of landfills without refuse dam. The optimum design of refuse dam can be conducted according to the results of the consistent model.