低厨余城市生活垃圾物理力学特性随龄期变化  

Changes in basic physical and mechanical characteristics of low-kitchen-waste municipal solid waste with age

作　　者：张炜 黄兴 殷建钢 施皓 张晓磊[3,4] Zhang Wei;Huang Xing;Yin Jiangang;Shi Hao;Zhang Xiaolei(Wuxi City Environmental Technology Company,Ltd.,Wuxi 214026,China;Wuxi Water Group Company,Ltd.,Wuxi 214031,China;Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Geotechnical and Underground of Ministry of Education,Tongji University,Shanghai 200092,China)

机构地区：[1]无锡城市环境科技有限公司,江苏无锡214026 [2]无锡市水务集团有限公司,江苏无锡214031 [3]同济大学地下建筑与工程系,上海200092 [4]岩土及地下工程教育部重点实验室,上海200092

出　　处：《工程勘察》2023年第11期24-29,共6页Geotechnical Investigation & Surveying

摘　　要：垃圾组分的不同导致其物理力学特性存在较大差异性,这将影响填埋场的设计和运营。针对中国东南某填埋场未含厨余垃圾的短龄期垃圾,通过现场钻孔取样,室内测试其基本物理力学特性,包括垃圾组分、质量含水率、比重和剪切特性等,其中剪切特性由大型直剪试验得到。结果表明:随龄期增大,垃圾中纸、木等易降解纤维含量逐渐减少,织物和剩余物质含量逐渐增加,其中剩余物质含量相比国内其它填埋场较少。渗滤液水位以上,质量含水率维持在85%~90%,水位以下,质量含水率逐渐从161%减小至90%。取10%作为破坏应变,随着垃圾填埋深度从5m增大到25m,其粘聚力从0kPa增至12kPa,内摩擦角从29.5°降至25.1°,这是由织物等加筋相和剩余物质含量变化导致,且内摩擦角与剩余物质含量呈线性相关。It is essential to determine the basic physical and mechanical properties of municipal solid waste(MSW)for the design and operation of landfills.The basic physical and mechanical properties of some MSW samples obtained by drilling in a landfill in southeast China were tested.The test included waste composition,moisture content,specific gravity and shear behavior,and the large direct shear apparatus was adopted to test the shear behavior of MSW.The test results show that with the increase of fill age,the content of easily degradable fiber such as paper and wood gradually decreases,and the content of cloth and residual matter gradually increases.The content of residual matter is less than other domestic landfills.Above the leachate water level,the moisture content varies between 85%and 90%,while below the water level,the moisture content is gradually reduced from 161%to 90%.With the depth increases from 5m to 25m and taking 10%as the failure strain,the cohesion increases from 0kPa to 12kPa,and the internal friction angle decreases from 29.5°to 25.1°,which is caused by the content change of the reinforced phase and residual matter,and the internal friction angle is linearly related to the residual matter content.

关 键 词：城市生活垃圾 物理特性 抗剪强度 龄期 

分 类 号：TU411[建筑科学—岩土工程]