填埋场振动台试验及渐进式损伤能量识别  

Shaking table tests on landfills and identification of progressive damage energy

作　　者：林浩宇 谢海建[1] 李俊超[1,2] 赵哲辉 陈肖滨 蒋建群[1,2] 陈云敏[1,2] LIN Haoyu;XIE Haijian;LI Junchao;ZHAO Zhehui;CHEN Xiaobin;JIANG Jianqun;CHEN Yunmin(MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering,Zhejiang University,Hangzhou 310058,China;Center for Hypergravity Experiment and Interdisciplinary Research,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]浙江大学软弱土与环境土工教育部重点室验室,浙江杭州310058 [2]浙江大学超重力研究中心,浙江杭州310058

出　　处：《岩土工程学报》2024年第7期1427-1436,共10页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金重点基金项目(41931289);国家基础科学中心项目(51988101)。

摘　　要：为了探讨地震作用下含导排衬垫层填埋场的损伤变形特性,开展了含导排衬垫层的填埋场边坡的大型振动台试验,并根据填埋场各处动态响应规律,提出了一种基于希尔伯特-黄(HHT)和边际谱的能量识别方法。该方法能够用于识别填埋场整体损伤和局部损伤,并根据实测位移值对该方法的有效性进行了讨论。试验结果表明,在输入波峰值加速度为0.3g时,坡脚正位移峰值及坡中负位移峰值突变;希尔波特谱峰值(PSHEA)随着高度的增加而增加,填埋场固废层希尔伯特能量大于衬垫及导排系统;输入波峰值加速度为0.3g及0.4g时,导排衬垫界处抗剪强度低面及中老固废交界震陷,边际谱峰值(PMSA)发生突变,能量传递异常。填埋场在地震作用下的损伤主要分为3个阶段:0.1g~0.2g未发生破坏阶段,0.3g~0.4g局部损伤阶段,破坏由导排及衬垫系统开始,0.5g整体破坏阶段填埋场边坡进入塑性变化;输入波幅值达到0.3g时衬垫导排层先产生滑移,峰值时刻固废交界处发生破坏。研究成果可为填埋场在地震作用下的损伤预测及填埋场抗震减灾技术设计提供参考依据。In order to investigate the damage deformation characteristics of landfills containing drainage layer and liners under earthquake,a large shaking table test on a landfill slope containing drainage layer and liners is carried out,and an energy identification method based on the Hilbert-Huang(HHT)and marginal spectrum is proposed based on the dynamic response law of acceleration at each part of the landfill.The method can be used to identify the overall damage and local damage of the landfill,and the effectiveness of the method is discussed based on the measured displacement.The test results show that at the peak seismic intensity of 0.3g,the peak positive displacement at the foot of the slope and the peak negative displacement in the slope change abruptly.The PSHEA increases with height,and the Hilbert energy of municipal solid waste layer is larger than that of the liners and the drainage layer.At the peak acceleration of the input waves of 0.3g and 0.4g,the shear strength of the drainage liner is low,the interface of partially and fully degraded municipal solid waste is trapped,the PMSA changes abruptly,and the energy transfer is abnormal.The damage of the landfill under earthquake is mainly divided into three stages:0.1g-0.2g without damage stage;0.3g-0.4g local damage stage,when the damage starts from the drainage layer and liner system at the inner slope corner;and 0.5g overall damage stage of landfill slope into plastic change.Under 0.3g Taft waves,the drainage layer and liners slip first,and the interface of partially and fully degraded municipal solid waste is damaged at the peak moment.The research results can provide a reference basis for the prediction of deformation damage of landfills under earthquake and the design of their seismic mitigation technology.

关 键 词：填埋场 振动台试验 能量 希尔伯特谱 边际谱 滑动平均法 损伤 

分 类 号：TU435[建筑科学—岩土工程]