考虑渗滤液作用的填埋场边坡组合破坏稳定分析
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摘要
现代卫生填埋场广泛采用复合衬垫结构,破坏面沿底坡衬垫界面和垃圾体内部的组合破坏形式是填埋场可能的失稳形态之一,相应的计算分析有待进一步完善。将潜在滑坡体划分为主动体和被动体两部分。其中,被动体沿底坡衬垫界面发生平移滑动破坏,主动体沿垃圾体内部破坏面发生转动破坏。首先,采用极限平衡理论,推导了被动体发生平移滑动时的临界启动荷载的表达式;基于极限分析上限定理,对主动体的转动破坏机制进行了分析,得到了主动体剩余下滑力的计算表达式。然后,由主、被动滑体之间的作用力相等,且考虑渗滤液水位作用的影响,提出了填埋场发生组合破坏的稳定安全系数的计算分析方法。结果表明,相比黏聚力,底坡衬垫界面的内摩擦角对填埋场稳定性的影响更为明显,因而衬垫系统的修建宜选择内摩擦角较高材料;背坡渗滤液水位越高,填埋场发生大规模失稳的可能性越大;前坡渗滤液溢出点越高,靠近填埋场前坡的浅层垃圾体越容易发生局部破坏。实际工程中,渗滤液水位的升高会严重降低填埋场的稳定性,应引起足够重视,确保填埋场的安全运营。
Composite linear is widely used in modern sanitary landfills.Composite failure is one of the possible failure modes of landfills,in which the failure surface is through the waste mass and along the bottom liner systems.The corresponding calculation method must be modified for combined failure mode of landfill slopes.In this paper,the potential slide wedge was divided into two discrete parts,i.e.an active rotation sliding block and a passive translational sliding block.The expression of the critical load is derived for the passive sliding block on the basis of the limit equilibrium theory.Based on the limit analysis upper bound theorem,the rotation sliding failure mechanism of the active block is analyzed to propose the calculation formula of the residual sliding force.Considering the interaction between passive and active blocks,the stability analysis method for combined failure mode of landfill slope is established considering the effect of leachate level.The results show that the stability of landfills could be improved significantly with a larger internal friction angle of bottom liners compared with cohesion.If the leachate level at back slope of landfill increases,the possibility of large-scale failure in landfill is greater.With a higher value of leachate level at front slope of landfill,the shallow waste mass near the front slope may fail easily.Therefore,it is necessary to pay attention to the rise of leachate level to ensure the safety of landfill,and it is recommended to use geotextile materials with a higher internal friction angle in practical engineering.
Composite linear is widely used in modern sanitary landfills.Composite failure is one of the possible failure modes of landfills,in which the failure surface is through the waste mass and along the bottom liner systems.The corresponding calculation method must be modified for combined failure mode of landfill slopes.In this paper,the potential slide wedge was divided into two discrete parts,i.e.an active rotation sliding block and a passive translational sliding block.The expression of the critical load is derived for the passive sliding block on the basis of the limit equilibrium theory.Based on the limit analysis upper bound theorem,the rotation sliding failure mechanism of the active block is analyzed to propose the calculation formula of the residual sliding force.Considering the interaction between passive and active blocks,the stability analysis method for combined failure mode of landfill slope is established considering the effect of leachate level.The results show that the stability of landfills could be improved significantly with a larger internal friction angle of bottom liners compared with cohesion.If the leachate level at back slope of landfill increases,the possibility of large-scale failure in landfill is greater.With a higher value of leachate level at front slope of landfill,the shallow waste mass near the front slope may fail easily.Therefore,it is necessary to pay attention to the rise of leachate level to ensure the safety of landfill,and it is recommended to use geotextile materials with a higher internal friction angle in practical engineering.
引文
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[5]冯长根,胡秀峰.2002年我国事故与灾害状况综述[J].安全与环境学报,2003,3(3):68-73.Feng Ch G,Hu X F.Review of accidents and disasters in China in the year 2002[J].Journal of Safety and Environment,2003,3(3):68-73.(in Chinese)
[6]Koerner R M,Soong T Y.Stability assessment of ten large landfill failures,advances in transportation and geo-environmental systems using geosynthetics[C]//Proceedings of Sessions of Geodenver 2000.[S.l.]:ASCE Geotechnical Special Publication,2000:1-38.
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[8]Qian X,Koerner R M.Effect of apparent cohesion on translational failure analyses of landfills[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2004,130(1):71-80.
[9]Qian X,Koerner R M.Stability analysis when using an engineered berm to increase landfill space[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2009,135(8):1 082-1 091.
[10]Qian X.Limit equilibrium analysis of translational failure of landfills under different leachate buildup conditions[J].Water Science and Engineering,2008,1(1):44-62.
[11]Qian X,Koerner R M.Modification to translational failure analysis of landfills incorporating seismicity[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2010,136(5):718-727.
[12]涂帆,吴晓杰,王全凤.设垃圾坝卫生填埋场平移破坏的统一分析模型[J].岩石力学与工程学报,2009,28(9):1 928-1 935.Tu F,Wu X J,Wang Q F.Consistent model of translational failure analysis of sanitary landfills with refuse dam[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(9):1 928-1 935.(in Chinese)
[13]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):281-285.Zhu X R,Wang Zh H,Fang P F,et al.Study on feasibility of enlarging capacity in Tianziling waste landfill[J].Chinese Journal of Geotechnical Engineering,2002,24(3):281-285.(in Chinese)
[14]施建勇,雷省.考虑破坏面转移和垃圾坝作用的边坡稳定分析[J].岩土工程学报,2014,36(6):998-1 004.Shi J Y,Lei Sh.Slope stability analysis method considering transfer of sliding failure surface and influence of engineered berm[J].Chinese Journal of Geotechnical Engineering,2014,36(6):998-1 004.(in Chinese)
[15]黄茂松,王浩然,刘怡林.基于转动-平动组合破坏机构的含软弱夹层土坡降雨入渗稳定上限分析[J].岩土工程学报,2012,34(9):1 561-1 567.Huang M S,Wang H R,Liu Y L.Rotation-translation combined mechanism for stability analysis of slopes with weak interlayer under rainfall condition[J].Chinese Journal of Geotechnical Engineering,2012,34(9):1 561-1 567.(in Chinese)
[16]施建勇,栾金龙.垃圾体内部与衬里界面组合破坏稳定分析方法研究[J].岩土力学,2013,34(9):2 576-2 582.Shi J Y,Luan J L.Stability analysis method for composite failure through base liner and waste filling[J].Rock and Soil Mechanics,2013,34(9):2 576-2 582.(in Chinese)
[17]范鑫萍,黄茂松,王浩然.考虑龄期分层的固体废弃物填埋场边坡稳定分析[J].岩土力学,2016,37(6):1 715-1 720.Fan X P,Huang M S,Wang H R.Stability analysis of a municipal solid waste slope layered by aging[J].Rock and Soil Mechanics,2016,37(6):1 715-1 720.(in Chinese)
[18]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):1 679-1 705.Zhan L T,Guan R Q,Chen Y M,et al.Monitoring and back analyses of slope failure process at a landfill[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(8):1 679-1 705.(in Chinese)
[19]Chen W F.Limit analysis and soil plasticity[M].York:Elsevier Scientific Pub.Co.,1975.
[2]Merry S M,Kavazanjian Jr E,Fritz W U.Reconnaissance of the July 10,2000,Payatas landfill failure[J].Journal of Performance of Constructed Facilities,2005,19(2):100-107.
[3]Kolsch F,Fricke K,Mahler C,et al.Stability of landfills:The Bandung dumpsite disaster[C]//Proceedings of the 10th International Waste Management and Landfill Symposium.Cagliari,Italy:[s.n.],2005.
[4]Blight G.Slope failures in municipal solid waste dumps and landfills:a review[J].Waste Management and Research,2008,26(5):448-463.
[5]冯长根,胡秀峰.2002年我国事故与灾害状况综述[J].安全与环境学报,2003,3(3):68-73.Feng Ch G,Hu X F.Review of accidents and disasters in China in the year 2002[J].Journal of Safety and Environment,2003,3(3):68-73.(in Chinese)
[6]Koerner R M,Soong T Y.Stability assessment of ten large landfill failures,advances in transportation and geo-environmental systems using geosynthetics[C]//Proceedings of Sessions of Geodenver 2000.[S.l.]:ASCE Geotechnical Special Publication,2000:1-38.
[7]Qian X,Koerner R M,Gray D H.Translational failure analysis of landfills[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2003,129(6):506-519.
[8]Qian X,Koerner R M.Effect of apparent cohesion on translational failure analyses of landfills[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2004,130(1):71-80.
[9]Qian X,Koerner R M.Stability analysis when using an engineered berm to increase landfill space[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2009,135(8):1 082-1 091.
[10]Qian X.Limit equilibrium analysis of translational failure of landfills under different leachate buildup conditions[J].Water Science and Engineering,2008,1(1):44-62.
[11]Qian X,Koerner R M.Modification to translational failure analysis of landfills incorporating seismicity[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2010,136(5):718-727.
[12]涂帆,吴晓杰,王全凤.设垃圾坝卫生填埋场平移破坏的统一分析模型[J].岩石力学与工程学报,2009,28(9):1 928-1 935.Tu F,Wu X J,Wang Q F.Consistent model of translational failure analysis of sanitary landfills with refuse dam[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(9):1 928-1 935.(in Chinese)
[13]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):281-285.Zhu X R,Wang Zh H,Fang P F,et al.Study on feasibility of enlarging capacity in Tianziling waste landfill[J].Chinese Journal of Geotechnical Engineering,2002,24(3):281-285.(in Chinese)
[14]施建勇,雷省.考虑破坏面转移和垃圾坝作用的边坡稳定分析[J].岩土工程学报,2014,36(6):998-1 004.Shi J Y,Lei Sh.Slope stability analysis method considering transfer of sliding failure surface and influence of engineered berm[J].Chinese Journal of Geotechnical Engineering,2014,36(6):998-1 004.(in Chinese)
[15]黄茂松,王浩然,刘怡林.基于转动-平动组合破坏机构的含软弱夹层土坡降雨入渗稳定上限分析[J].岩土工程学报,2012,34(9):1 561-1 567.Huang M S,Wang H R,Liu Y L.Rotation-translation combined mechanism for stability analysis of slopes with weak interlayer under rainfall condition[J].Chinese Journal of Geotechnical Engineering,2012,34(9):1 561-1 567.(in Chinese)
[16]施建勇,栾金龙.垃圾体内部与衬里界面组合破坏稳定分析方法研究[J].岩土力学,2013,34(9):2 576-2 582.Shi J Y,Luan J L.Stability analysis method for composite failure through base liner and waste filling[J].Rock and Soil Mechanics,2013,34(9):2 576-2 582.(in Chinese)
[17]范鑫萍,黄茂松,王浩然.考虑龄期分层的固体废弃物填埋场边坡稳定分析[J].岩土力学,2016,37(6):1 715-1 720.Fan X P,Huang M S,Wang H R.Stability analysis of a municipal solid waste slope layered by aging[J].Rock and Soil Mechanics,2016,37(6):1 715-1 720.(in Chinese)
[18]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):1 679-1 705.Zhan L T,Guan R Q,Chen Y M,et al.Monitoring and back analyses of slope failure process at a landfill[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(8):1 679-1 705.(in Chinese)
[19]Chen W F.Limit analysis and soil plasticity[M].York:Elsevier Scientific Pub.Co.,1975.
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