MONITORING AND BACK ANALYSES OF SLOPE FAILURE PROCESS AT A LANDFILL
MONITORING AND BACK ANALYSES OF SLOPE FAILURE PROCESS AT A LANDFILL
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发表时间：
2010
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通讯作者：
Liu Zhao
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作者：
Liu Zhao
本文所研究的垃圾填埋场是我国最早采用复合衬垫系统的卫生填埋场之一，2008年6月，由于连续发生的重撞击，导致填埋场发生边坡失稳，通过现场监测记录了边坡失稳过程，监测项目包括地表水平位移、深层侧向位移、根据监测结果，对边坡的稳定性进行了反分析，本文还介绍了为防止该大型垃圾填埋场进一步发生灾难性破坏而采取的应急措施监测和理论分析得出以下结论：高渗滤液水平，深层侧向位移的测量结果表明，滑坡发生在填埋场底部复合衬垫系统的沿着弱界面，导致垃圾体发生明显的侧向位移，滑坡的发生与填埋场内部观测到的位移速率密切相关复合衬层界面强度受置换软化效应影响，沿衬层沿着方向的抗剪强度介于峰值强度和剩余强度之间，从垂直威尔斯井抽水降低渗滤液水位是最有效可行的应急措施。
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.