Abstract：The landfill studied in this paper is one of the earliest sanitary landfills with composite liner system installed in China. A slope failure took place in the landfill as a result of successive heavy rainfalls in June 2008. A field monitoring program was carried out to record the slope failure process. The monitoring items include surface horizontal displacement，deep lateral displacement，and leachate level within the slope. On the basis of the monitoring results，back analyses were carried out to access the slope stability，as well as to determine interface shear strength of the composite liner system. This paper also report the emergency measures taken for preventing further catastrophic failure of the huge landfill. The field monitoring and theoretical analyses came to the following conclusions. The high leachate level，which was found to be closely correlated with the measured displacement rate observed in the landfill is a major factor leading to the slope instability. The measurement of deep lateral displacement indicated that the slip took place along the weak interface of the composite liner system at the bottom of landfill. The significant lateral movement of waste body resulted in a displacement-softening effect on the interface strength of composite liner system，and hence the shear strength along the liner was in between the peak and residual strength. Drawdown of leachate level by pumping from vertical wells was found to be the most effective and workable emergency measure.
詹良通，管仁秋，陈云敏，刘钊. 某填埋场垃圾堆体边坡失稳过程监测与反分析[J]. 岩石力学与工程学报, 2010, 29(08): 1697-1705.
ZHAN Liangtong，GUAN Renqiu，CHEN Yunmin，LIU Zhao. MONITORING AND BACK ANALYSES OF SLOPE FAILURE PROCESS AT A LANDFILL. , 2010, 29(08): 1697-1705.
