塑料含量对MSW强度特性影响及边坡稳定性分析  

Plastic content impact on strength of MSW and slope stability analysis

作　　者：陈嘉瑞 李玉萍[1,2] 施建勇 姜兆起 Chen Jiarui;Li Yuping;Shi Jianyong;Jiang Zhaoqi(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098, China;Wuhu Surveying and Mapping Design Institute Co.,Ltd.,Wuhu 241000,China)

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室岩土工程研究所,江苏南京210098 [2]芜湖市勘察测绘设计研究院有限责任公司,安徽芜湖241000

出　　处：《能源与环保》2022年第4期30-38,共9页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：国家自然科学基金青年基金项目(41702290);中央高校基本科研业务费项目(2019B02114)。

摘　　要：参考国内典型垃圾填埋场中城市固体废弃物主要成分,通过人工配制垃圾土样(MSW),利用GDS三轴仪开展固结排水剪切试验,研究了不同塑料含量对垃圾土样强度特性的影响。试验结果表明,不同塑料含量垃圾土试样的应力—应变曲线全部呈现应变—硬化特性。随着塑料含量的增加,垃圾土的强度减小;垃圾土中塑料含量的增加对垃圾土试样黏聚力影响较为显著,表现为塑料含量增加,垃圾土的黏聚力呈明显的下降趋势,而对其内摩擦角的影响并不明显。同时,基于Geo-slope软件采用Morgenstern-Price方法开展了填埋场边坡稳定性分析,计算结果表明,垃圾土的塑料含量、渗滤液水位过高以及垃圾土自身抗剪强度较低,都会直接降低垃圾填埋场的安全系数以及稳定性,增加填埋场失稳的风险。Based on the main components of municipal solid waste of typical landfills in China,the effects of plastic contents on the shear strength of synthetic MSW were studied by using GDS triaxial apparatus to conduct triaxial CD tests.The test results showed that the stress-strain curves of MSW with different plastic contents all show strain-hardening characteristics.With the increase of plastic content,the shear strength of the MSW decreases.The increase of plastic content in specimens has a significant effect on the cohesion of MSW,which is manifested as the increase of plastic content,and the cohesion of MSW shows an obvious downward trend,while the effect on the internal friction angle is not obvious.Meanwhile,based on Geo-slope software,Morgenstern-Price method was used to analyze the slope stability of landfill.The calculation results showed that the plastic content of MSW,the high leachate water level and the lower shear strength of MSW will directly reduce the safety factor and stability of landfill and increase the risk of instability of landfill.

关 键 词：垃圾土 塑料含量 变形强度 强度参数 边坡稳定性 

分 类 号：TU473[建筑科学—结构工程]