考虑衬垫布置型式的平原型填埋场动力响应与变形分析

Seismic Response and Dynamic Displacement Analysis of Area Landfill Considering the Layout of Liner System

填埋法是我国垃圾的主要处置手段,衬垫系统是垃圾填埋场的重要部分。衬垫界面的动力剪切强度较低,在地震作用下填埋场极易沿衬垫界面发生整体失稳破坏。首先建立了界面动力模型和垃圾土黏弹性动力本构,考虑光面衬垫和糙面衬垫的差异性,建立了四种不同衬垫布置形式平原型填埋场动力分析模型,研究衬垫布置形式对平原型填埋场动力稳定性的影响。研究结果表明,衬垫布置形式对平原型填埋场顶部的动力响应与变形影响不大,采用糙面衬垫布置形式能够大幅减小平原型填埋场底部位置的永久变形,有利于提升填埋场的动力稳定性,对平原型填埋场衬垫系统的抗震设计有指导意义。

Landfills are mostly being used for disposing municipal solid waste in China,and a liner system is of huge significance in landfills.The landfill liner interface is of low dynamic shear strength,leading to a potential sliding failure along the liner interface under earthquakes.In this study,the dynamic interface model of landfill liner and visco-elastic dynamic constitutive model of waste are established and embedded in a numerical analysis platform.Four numerical models of area landfills with different types of liner layout are established involving different combinations of smooth liner and textured liner.The research results show that the liner layout has a little effect on the dynamic response and deformation of the top positions of the area landfill.The liner of textured geomenbrane can greatly reduce the permanent deformation of the bottom positions of the area landfill,which is beneficial to the seismic stability of the area landfill.The research results are instructive for the seismic design of the liner system of the area landfill.