设坝垃圾填埋场沿衬里界面地震稳定性的拟静力分析  

Quasi-static analysis for the earthquake stability assessment of the landfills with a retaining dam along the underlying liner system

作　　者：贺建清[1] 施爽彦 高文华[1] HE Jian-qing;SHI Shuang-yan;GAO Wen-hua(Hunan Provincial Key laboratory of Geotechnical Engineering for Stability Control and Health Monitoring,Hunan University of Science and Technology,Xiangtan 411201,Hunan,China)

机构地区：[1]湖南科技大学岩土工程稳定控制与健康监测省重点实验室,湖南湘潭411201

出　　处：《安全与环境学报》2020年第5期1736-1742,共7页Journal of Safety and Environment

基　　金：国家自然科学基金项目(41272324);湖南省教育厅科学研究项目(18A189)。

摘　　要：复合衬里系统是现代垃圾填埋工程中常有的防渗结构体系,因其界面抗剪强度比较低,垃圾填埋场易沿底部复合衬里界面发生平移破坏,且随着作用在复合衬里界面上的法向应力增加,破坏面在复合衬里不同界面间发生转移。考虑填埋场底部复合衬里极限破坏界面转移和垃圾坝对填埋体稳定性的影响,采用拟静力法引入地震力,建立填埋场沿坝背和沿坝底破坏模式下的五楔体分析模型。对各楔体进行拟静力平衡分析,并建立平衡方程,求解地震作用下填埋体沿底部复合衬里界面滑动的安全系数。结果表明,水平地震惯性力对垃圾填埋场沿底部复合衬界面的稳定性有显著影响,随水平地震惯性力增加,填埋场安全系数显著降低。水平地震惯性力高的情况下,竖向地震惯性力对填埋场安全系数的影响不容忽视,在高设防条件下,应考虑竖向地震惯性力的影响。垃圾坝背坡坡角较小时,沿坝背发生平移破坏的可能性较大,反之,沿坝底发生平移破坏的可能性较大。随水平地震惯性力增加,沿坝背发生平移破坏的可能性增加,沿坝底发生平移破坏的可能性减小。The present paper is to establish an analysis model for the 5 wedges under the failure mode of the landfill along the backside of the dam and the bottom of the dam,while considering the ultimate failure interface transfer of the bottom lining of the landfill and the impact of the garbage dam on the stability of the landfill. For the above said purposes,the paper intends to introduce the seismic force into the quasi-static method in the modern landfill engineering composite lining system. As is well known,the so-called quasi-static method is a kind of common anti-seepage structure system. For its low interface shear strength,it is rather easy to move the landfills along the bottom of the composite liner system with the increase of the normal stress on the interface and with the failure surface transfer between the different interfaces of the composite liner. Therefore,the quasi-static equilibrium analysis of all the wedges can be carried out to establish an equilibrium equation to solve the safety factors of the landfills sliding along the bottom composite lining under the earthquake shaking action. Our analysis shows that the horizontal seismic inertial force may have a significant impact on the stability of the landfill along the pad interface. And,then,the landfill safety factors can easily be reduced with the increase of the horizontal seismic inertial force. For instance,in case of high horizontal inertial force,the influence of the vertical seismic inertial force should not be neglected on the safety factors of the landfill. And in turn,it should not neglect the influence of the vertical seismic inertial force under the condition of high fortification. In addition,since the landfill is prone to get slipped along the backside of the dam under the action of seismic inertial force,it is better to adopt the landslide failure mode along the dam when analyzing the seismic stability of the landfill along the lining,for the possibility of the transitional damage along the backside of the dam can usually be greater w

关 键 词：安全工程 地震 垃圾填埋场 垃圾坝 稳定性分析 拟静力方法 

分 类 号：X915.5[环境科学与工程—安全科学]