城市生活垃圾土的大型水平剪切试验研究
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摘要
垃圾土成分极不均匀,工程性质变化幅度大,小直径、小尺寸试样的试验结果难以反映垃圾土的宏观性质。为获取具有代表性的城市生活垃圾抗剪强度参数,采用大尺寸试样分析城市生活垃圾的组成,测定垃圾土的容重和含水率,利用自研的水平推剪试验装置进行大型水平推剪试验。研究结果表明:城市生活垃圾经过4 a降解,垃圾成分主要以土、建筑垃圾、塑料和玻璃陶瓷为主,厨余和纸制品等易降解部分基本降解完毕;生活垃圾的密度为1.06～1.25 g/cm3,小于普通土;生活垃圾的含水率为18.10%～25.63%。重塑垃圾土的抗剪强度指标为:c=41.94 kPa,φ=26.46°;饱和重塑垃圾土的抗剪强度指标为:c=47.96 kPa,φ=25.26°。浸水饱和后的垃圾土,内摩擦角略有降低,黏聚力有小幅增长;试验结果与大型三轴试验较为接近。
Due to heterogeneity of MSW, its mechanical properties change within a broad range. And it is difficult to gain its macroscopic property according to small size or small diameter test result. In order to obtain representative shear strength parameters of MSW, the components of MSW have been analyzed and its unit weight and water content have been mensurated with large scale tests. The large scale horizontal push-shear tests were carried out by using self-developed large scale horizontal push-shear test device. The test results indicate that after degradation of 4 years the major components of MSW are soil construction waste, plastic material, glass and ceramics, while kitchen waste,paper products and other easily biodegradable materials, have been already basically degraded. It is found that the density of MSW varies from 1.06 g/cm3 to 1.25 g/cm3, which is less than that of common soils. And the water content of MSW varies of 18.10% to 25.63%. The shear strength index of reconstituted MSW is as follows: c=41.94 kPa, φ=26.46°; and that of reconstituted MSW after soaking immersion is as follows: c=47.96 kPa, φ=25.26°. The friction angle φ of reconstituted MSW after soaking decreases slightly, and its cohesion increases slightly. The value of the shear strength parameters obtained by large scale horizontal push-shear tests is close to the value of the shear strength parameters obtained by large scale triaxial shear tests.
Due to heterogeneity of MSW, its mechanical properties change within a broad range. And it is difficult to gain its macroscopic property according to small size or small diameter test result. In order to obtain representative shear strength parameters of MSW, the components of MSW have been analyzed and its unit weight and water content have been mensurated with large scale tests. The large scale horizontal push-shear tests were carried out by using self-developed large scale horizontal push-shear test device. The test results indicate that after degradation of 4 years the major components of MSW are soil construction waste, plastic material, glass and ceramics, while kitchen waste,paper products and other easily biodegradable materials, have been already basically degraded. It is found that the density of MSW varies from 1.06 g/cm3 to 1.25 g/cm3, which is less than that of common soils. And the water content of MSW varies of 18.10% to 25.63%. The shear strength index of reconstituted MSW is as follows: c=41.94 kPa, φ=26.46°; and that of reconstituted MSW after soaking immersion is as follows: c=47.96 kPa, φ=25.26°. The friction angle φ of reconstituted MSW after soaking decreases slightly, and its cohesion increases slightly. The value of the shear strength parameters obtained by large scale horizontal push-shear tests is close to the value of the shear strength parameters obtained by large scale triaxial shear tests.
引文
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[17]陈云敏,林伟岸,詹良通,等.城市生活垃圾抗剪强度与填埋龄期关系的试验研究[J].土木工程学报,2009,42(3):111-117.CHEN Yunmin,LIN Weian,ZHAN Liangtong,et al.Astudy on the relationship between the shear strength of municipal solid waste and the fill age[J].China Civil Engineering Journal,2009,42(3):111-117.
[2]詹良通,管仁秋,陈云敏,等.某填埋场垃圾堆体边坡失稳过程监测与反分析[J].岩石力学与工程学报,2010,29(8):1697-1705.ZHAN Liangtong,GUAN Renqiu,CHEN Yunmin,et al.Monitoring and back analysis of slope failure process at a landfill[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(8):1697-1705.
[3]涂帆,钱学德.中美垃圾填埋场垃圾土的重度、含水量和相对密度[J].岩石力学与工程学报,2001,27(增1):3075-3081.TU Fan,QIAN Xuede.Unit weight,water content and specific gravity of municipal solid waste in China and United States[J].Chinese Journal of Rock Mechanics and Engineering,2001,27(Suppl 1):3075-3081.
[4]朱向荣,谢新宇,王朝晖,等.杭州天子岭垃圾填埋体土工性状试验研究[J].土木工程学报,2004,37(10):52-58.ZHU Xiangrong,XIE Xinyu,WANG Zhaohui,et al.An experiment study on the geotechnical behavior of the Tianziling solid waste landfill of Hanzhou[J].China Civil Engineering Journal,2004,37(10):52-58.
[5]骆行文,杨明亮,姚海林,等.陈垃圾土的工程力学特性试验研究[J].岩土工程学报,2006,28(5):622-625.LUO Xingwen,YANG Mingliang,YAO Hailin,et al.Experimental study on engineering mechanical properties of stale refuse[J].Chinese Journal of Rock Mechanics and Engineering,2006,28(5):622-625.
[6]Richardson G,Reynolds D.Geosynthetic considerations in a landfill on compressible clays[C]//In:Proceedings of Geosynthetics 91(2)St Paul MN:Industrial Fabrics Association International,1991.
[7]Kavazangians S J,Matasovic N,Bonaparte R,et al.Evaluation of MSW properties for seismic analysis[C]//In:Proceedings of Geoenvironment 2000[Geotechnical Special Publication No46].New Orleans,LA:ASCE,1995.
[8]陈云敏,王立忠,胡亚元,等.城市固体垃圾填埋场边坡稳定分析[J].土木工程学报,2000,33(3):92-97.CHEN Yunmin,WANG Lizhong,HU Yayuan,et al.Stability analysis of a solid waste landfill slope[J].China Civil Engineering Journal,2000,33(3):92-97.
[9]朱向荣,王朝晖,方鹏辉.杭州天子岭垃圾填埋场扩容可行性研究[J].岩土工程学报,2002,24(3):281-285.ZHU Xiangrong,WANG Zhaohui,FANG Penghui.Study on feasibility of enlarging capacity in Tianziling waste landfill[J].Chinese Journal of Geotechnical Engineering,2002,24(3):281-285.
[10]张振营,吴世明,陈云敏.城市生活垃圾土性参数的室内试验研究[J].岩土工程学报,2000,22(1):35-39.ZHANG Zhenying,WU Shiming,CHEN Yunmin.Experimental research on the parameter of life rubbish in city[J].Chinese Journal of Geotechnical Engineering,2000,22(1):35-39.
[11]张振营,严立俊,吴大志,等.新鲜生活垃圾抗剪强度参数变化规律研究[J].岩土工程学报,2015,37(3):432-439.ZHANG Zhenying,YAN Lijun,WU Dazhi,et al.Experimental study on shear strength parameters of fresh municipal solid waste[J].Chinese Journal of Geotechnical Engineering,2015,37(3):432-439.
[12]张季如,陈超敏.城市生活垃圾抗剪强度参数的测试与分析[J].岩石力学与工程学报,2003,22(1):110-114.ZHAN Jiru,CHEN Chaomin.Measurement and analysis on shear strength parameters of municipal solid waste[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(1):110-114.
[13]Landva A O,Valsangkar A J,Pelkey S G.Lateral earth pressure at rest and compressibility of municipal solid waste[J].Canadian Geotechnical Journal,2000,37(6):1157-1165.
[14]Pelkey S G,Valsangkar A J,Landva A O.A shear displacement dependent strength of municipal solid waste[J].ASTM Geotechnical Testing Journal,2001,24(4):381-390.
[15]Machado S L,Carvallho F M,Vilar O M.Constitutive model for a shear displacement dependent strength of municipal solid waste[J].Journal of Geotechnical and Environmental Engineering,2002,128(11):940-951.
[16]冯世进,周子范,陈云敏,等.城市固体废弃物剪切强度参数的研究[J].浙江大学学报(工学版),2005,39(7):987-991.ZHOU Shijin,ZHOU Zifan,CHEN Yunmin,et al.Study on shear strength parameters of municipal solid waste[J].Journal of Zhejiang University(Engineering Science),2005,39(7):987-991.
[17]陈云敏,林伟岸,詹良通,等.城市生活垃圾抗剪强度与填埋龄期关系的试验研究[J].土木工程学报,2009,42(3):111-117.CHEN Yunmin,LIN Weian,ZHAN Liangtong,et al.Astudy on the relationship between the shear strength of municipal solid waste and the fill age[J].China Civil Engineering Journal,2009,42(3):111-117.