垃圾体内部与衬里界面组合破坏稳定分析方法研究
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摘要
垃圾填埋场沿底坡和背坡衬里界面发生平移破坏的工程实例较多,也有破坏面沿垃圾体内部和底坡的组合破坏形式,相应的计算分析方法有待完善。对组合破坏,根据垃圾体内部破坏面为库仑主动破坏面和组合破坏面上各点安全系数相同的假设,由刚体极限平衡条件,建立组合破坏的稳定计算方法。运用双楔体和组合破坏稳定分析方法对算例和Kettleman Hills填埋场工程实例进行计算分析。结果表明:双楔体法计算得到的最危险平移滑动破坏安全系数大于组合破坏最小安全系数;最危险破坏面是组合破坏面;对Kettleman Hills填埋场,组合滑动面也是可能的滑动破坏面。由此可见,组合破坏是垃圾填埋场可能的破坏形式之一,在进行垃圾填埋体滑动稳定分析计算时应进行组合破坏形式的计算分析。
The translational failure along liner system at bottom and back slope often happened in municipal waste landfill.The composite failure through the body of waste filling and bottom slope is other failure mode.The relative calculation method of slope stability in landfill for composite failure mode must be modified based on the current stability analysis method.For composite failure,it is assumed that failure surface in waste filling is in Coulomb's active situation and safety factor is identical at all points on the composite failure surface.On the limit equilibrium of rigid body,a new stability analysis method for composite failure is presented.The stability of a slope and Kettleman Hills' s landfill slope are calculated by the new method and two wedges method.The calculation results show that safety factor obtained by two wedges method for dangerous translational failure is higher than that by the above new method.The most dangerous slide failure surface is composite failure surface.For the Kettleman Hills' s landfill,the composite failure surface is possible sliding failure surface.It can be found that the composite failure is one of the possible failure modes.The composite failure mode must be considered for slope stability safety analysis of landfill.
The translational failure along liner system at bottom and back slope often happened in municipal waste landfill.The composite failure through the body of waste filling and bottom slope is other failure mode.The relative calculation method of slope stability in landfill for composite failure mode must be modified based on the current stability analysis method.For composite failure,it is assumed that failure surface in waste filling is in Coulomb's active situation and safety factor is identical at all points on the composite failure surface.On the limit equilibrium of rigid body,a new stability analysis method for composite failure is presented.The stability of a slope and Kettleman Hills' s landfill slope are calculated by the new method and two wedges method.The calculation results show that safety factor obtained by two wedges method for dangerous translational failure is higher than that by the above new method.The most dangerous slide failure surface is composite failure surface.For the Kettleman Hills' s landfill,the composite failure surface is possible sliding failure surface.It can be found that the composite failure is one of the possible failure modes.The composite failure mode must be considered for slope stability safety analysis of landfill.
引文
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[2]KOERNER R M,SOONG T Y.“Stability assessment of ten large landfill failures”,advances in transportation and geoenvironmental systems using geosynthetics[C]//Proceedings of Sessions of Geodenver 2000.[S.l.]:ASCE Geotechnical Special Publication,2000:1-38.
[3]QIAN XUEDE,KOERNER R M,GRAY D H.Translational failure analysis of landfills[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2003,129(6):506-519.
[4]QIAN XUEDE,KOERNER R M.Stability analysis for using engineered berm to increase landfill space[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2009,135(8):1082-1091.
[5]钱学德,施建勇.关于具有多层复合衬里填埋场稳定安全的探讨[J].岩土工程学报,2011,33(11):1676-1682.QIAN Xue-de,SHI Jian-yong.Stability problems for landfills with multilayer geosynthetic liner system[J].Chinese Journal of Geotechnical Engineering,2011,33(11):1676-1682.
[6]SULTAN H,SEED B.Stability of sloping core earth dams[J].Journal of the Soil Mechanics and Foundations Division,1967,93(SM4):45-67.
[7]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 Yun-min,WANG Li-zhong,HU Ya-yuan,et al.Stability analysis of solid waste landfill slope[J].China Civil Engineering Journal,2000,33(3):92-97.
[8]朱向荣,王朝晖,方鹏飞,等.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):281285.ZHU Xiang-rong,WANG Zhao-hui,FANG Peng-fei,et al.Study on feasibility of enlarging capacity in Tianziling waste landfill[J].Chinese Journal of Geotechnical Engineering,2002,24(3):281-285.
[9]刘君,孔宪京.卫生填埋场复合边坡地震稳定性和永久变形分析[J].岩土力学,2004,25(5):778-782.LIU Jun,KONG Xian-jing.Seismic stability and permanent displacement analysis of a solid waste landfill slope containing geomembrane[J].Rock and Soil Mechanics,2004,25(5):778-782.
[10]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):1679-1705.ZHAN Liang-tong,GUAN Ren-qiu,CHEN Yun-min,et al.Monitoring and back analyses of slope failure process at a landfill[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(8):1679-1705.
[11]BYRNE R J,KENDALL J,BROWN S.Cause and mechanism of failure of Kettleman Hills landfill B-19,Phase IA[C]//Proceedings of ASCE Specialty Conference on Stability and Performance of Slope and Embankments II.Berkeley:[s.n.],1992:1180-1215.
[12]钱家欢.土力学[M].南京:河海大学出版社,1995.
[13]沈珠江.理论土力学[M].北京:中国水利水电出版社,2000.
[14]KOERNER G R,NAREJO D.Direct shear database of geosynthetic-to-geosynthetic and geosynthetic-to-soil interfaces[R].Philadelphia:Geosynthetic Research Institute,Drexel University,2005.
[15]STARK T D,EID H T,EVANS W D,et al.Municipal solid waste slope failure:PartⅡstability analyses[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2000,126(5):408-419.
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