复杂荷载作用下填埋场HDPE土工膜受拉计算
|
摘要
采用FLAC程序对典型荷载作用下城市垃圾填埋场HDPE土工膜的受力状况进行了计算分析。3种荷载条件包括:36 m高垃圾堆体自重荷载(分层填埋);下卧软弱黏土层不均匀沉降引起的荷载;地震引起的动力荷载。计算结果显示:①土工膜内的拉应力随着垃圾土分层填埋、基础不均匀沉降、地震荷载的作用而积累;②基础不均匀沉陷是影响衬垫层土工膜局部拉应力的主要因素;③中等强度水平的地震动输入(例如,峰值加速度为0.25g)可使覆盖层土工膜端部锚固位置拉应力超过极限拉应力。
A finite difference analysis using the computer code FLAC was conducted for a landfill,in order to investigate the tensile stress level of HDPE geotechnical membrane under typical loading conditions in the landfill.The loading conditions considered mere:(1) the deadweight of layer-built waste filled up to 36m;(2) the loads induced by potential differential settlement of base;(3) the dynamic loads caused by earthquake.The main conclusions were that(1) the accumulative tensile stress was developed in HDPE membrane by waste dumping,differential settlement,and earthquake,(2) the remarkable stress in liner HDPE membrane was induced by differential settlement primarily(3) the tensile stress in cover system HDPE membrane was higher than ultimate strength of HDPE geotechnical membrane under motion input with moderate intensity(e.g.peak acceleration was 0.25g).
A finite difference analysis using the computer code FLAC was conducted for a landfill,in order to investigate the tensile stress level of HDPE geotechnical membrane under typical loading conditions in the landfill.The loading conditions considered mere:(1) the deadweight of layer-built waste filled up to 36m;(2) the loads induced by potential differential settlement of base;(3) the dynamic loads caused by earthquake.The main conclusions were that(1) the accumulative tensile stress was developed in HDPE membrane by waste dumping,differential settlement,and earthquake,(2) the remarkable stress in liner HDPE membrane was induced by differential settlement primarily(3) the tensile stress in cover system HDPE membrane was higher than ultimate strength of HDPE geotechnical membrane under motion input with moderate intensity(e.g.peak acceleration was 0.25g).
引文
[1]钱学德,郭志平,施建勇,等.现代卫生填埋场的设计与施工[M].北京:中国建筑工业出版社,2001.(QIAN Xue-de,GUO Zhi-ping,SHI Jian-yong,et al.Design and construction of modern sanitary landfill[M].Beijing:China Architecture&Building Press,2001.(in Chinese))
[2]徐光明,章为民,彭功勋.HDPE膜的力学特性受损伤影响初步研究[J].河海大学学报,2001,32(1):76–80.(XU Guang-ming,ZHANG Wei-min,PENG Gong-xun.Effect of damage on mechanical behavior of hdpe geomembrane[J].Journal of HoHai University(Natural Sciences),2001,32(1):76–80.(in Chinese))
[3]MA F.Axial tension development in the liner of a proposed cedar hills regional municipal solid waste landfill expansion[C]//FLAC and Numerical Modeling in Geomechanics.Tokyo:A A Balkema Publishers,2003.
[4]冯世进,陈云敏,孔宪京,邹德高.城市固体废弃物动力特性试验研究[J].岩土工程学报,2005,27(7):750–754.(FENG Shi-jin,CHEN Yun-min,KONG Xian-jing,ZOU De-gao.Experimental research on dynamic properties of municipal solid waste[J].Chinese Journal of Geotechnical Engineering,2005,27(7):750–754.(in Chinese))
[5]陈云敏,柯瀚,等.城市垃圾填埋体的动力特性及地震响应[J].土木工程学报,2002,35(3):66–71.(CHEN Yun-min,KE Han,et al.Dynamic properties and seismic response of municipal solid waste[J].China Civil Engneering Joural,2002,35(3):66–71.(in Chinese))
[6]LING Hoe I,MOHRI Yoshiyuki,KAWABATA Toshinori.Tensile properties of geogrids under cyclic loadings[J].Journal of Geotechnical and Geoenvironmental Engineering,1998(8):782–788.
[7]张涛.中型动三轴仪的研制及城市垃圾土动力特性试验研究[D].大连:大连理工大学,2004.(ZHANG Tao.Design of medium scale dynamic triaxial test apparatus and the dynamic characteristics of municipal solid waste[D].Dalian:Dalian University of Technology,2004.(in Chinese))
[2]徐光明,章为民,彭功勋.HDPE膜的力学特性受损伤影响初步研究[J].河海大学学报,2001,32(1):76–80.(XU Guang-ming,ZHANG Wei-min,PENG Gong-xun.Effect of damage on mechanical behavior of hdpe geomembrane[J].Journal of HoHai University(Natural Sciences),2001,32(1):76–80.(in Chinese))
[3]MA F.Axial tension development in the liner of a proposed cedar hills regional municipal solid waste landfill expansion[C]//FLAC and Numerical Modeling in Geomechanics.Tokyo:A A Balkema Publishers,2003.
[4]冯世进,陈云敏,孔宪京,邹德高.城市固体废弃物动力特性试验研究[J].岩土工程学报,2005,27(7):750–754.(FENG Shi-jin,CHEN Yun-min,KONG Xian-jing,ZOU De-gao.Experimental research on dynamic properties of municipal solid waste[J].Chinese Journal of Geotechnical Engineering,2005,27(7):750–754.(in Chinese))
[5]陈云敏,柯瀚,等.城市垃圾填埋体的动力特性及地震响应[J].土木工程学报,2002,35(3):66–71.(CHEN Yun-min,KE Han,et al.Dynamic properties and seismic response of municipal solid waste[J].China Civil Engneering Joural,2002,35(3):66–71.(in Chinese))
[6]LING Hoe I,MOHRI Yoshiyuki,KAWABATA Toshinori.Tensile properties of geogrids under cyclic loadings[J].Journal of Geotechnical and Geoenvironmental Engineering,1998(8):782–788.
[7]张涛.中型动三轴仪的研制及城市垃圾土动力特性试验研究[D].大连:大连理工大学,2004.(ZHANG Tao.Design of medium scale dynamic triaxial test apparatus and the dynamic characteristics of municipal solid waste[D].Dalian:Dalian University of Technology,2004.(in Chinese))
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心