设垃圾坝填埋场的三楔体滑动分析
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摘要
提出新建及扩建设垃圾坝填埋场的三楔体极限平衡分析法,给出安全系数的近似解,使得填埋场沿背部、底部及垃圾坝内坡处衬垫界面的三折线型滑动分析大为简化,发现其具有较好的工程适用性。该方法与精度较高的Spencer法所给出的计算结果吻合良好,且能考虑填埋体内摩擦角的影响。研究结果显示,衬垫界面的强度直接影响填埋体沿衬垫界面的稳定性,而填埋场各坡坡度、填埋场高度和宽度以及垃圾坝的高度对安全系数均有较大的影响。对扩建填埋场的分析结果表明,扩建填埋体沿新老场交界面的安全系数较低,在扩建填埋场的设计中应引起重视。另外,扩建填埋场的横向扩建宽度越大,则其界面安全稳定性越好。
The three-part wedge method for translational failure analyses of landfills retained by a toe dam was presented;and the approximate solution of the factor of safety was also given. With this approximate solution,analyses of the stability of new and expanded landfills along the back and bottom linings can be considerably simplified. Thus it is an acceptable method for the engineering application. Computed results by the proposed method are in good agreement with those by the Spencer′s method. Moreover,it can take into account the effect of the internal friction angle of the waste on the factor of safety. Parametric studies show that the interface strength of the lining determines the stability of the landfill along the lining. The angles of slopes,the height and width of the landfills and the height of the toe dam also greatly influence the sliding of the landfill along the lining. For the expanded landfill,more attentions should be paid to the failure along the intermediate lining between the existing and expansion wastes. Additionally,the wider the landfill expands horizontally,the better the stability along the intermediate lining is.
The three-part wedge method for translational failure analyses of landfills retained by a toe dam was presented;and the approximate solution of the factor of safety was also given. With this approximate solution,analyses of the stability of new and expanded landfills along the back and bottom linings can be considerably simplified. Thus it is an acceptable method for the engineering application. Computed results by the proposed method are in good agreement with those by the Spencer′s method. Moreover,it can take into account the effect of the internal friction angle of the waste on the factor of safety. Parametric studies show that the interface strength of the lining determines the stability of the landfill along the lining. The angles of slopes,the height and width of the landfills and the height of the toe dam also greatly influence the sliding of the landfill along the lining. For the expanded landfill,more attentions should be paid to the failure along the intermediate lining between the existing and expansion wastes. Additionally,the wider the landfill expands horizontally,the better the stability along the intermediate lining is.
引文
[1]KOERNER R M,SOONG T Y.Stability assessment of ten large landfill failures[C]//Proceedings of Sessions of GeoDenver,Advances in Transportation and Geoenvironmental Systems Using Geosynthetics[C].Denver:ASCE Geotechnical Special Publication,2000:138.
[2]BYRNE R J.Design issues with displacement-softening interfaces in landfill linings[C]//Proceedings of Waste Tech′94[C].Charleston:[s.n.],1994.
[3]FILZ G M,Esterhuizen J B,DUNCAN J M.Progressive failure of lined waste impoundments[J].Journal of Geotechnical and Geoenvironmental Engineering,2001,127(10):841848.
[4]QIAN X D,KOERNER R M,GRAY D H.Translational failure analysis of landfills[J].Journal of Geotechnical and Geoenvironmental Engineering,2003,129(6):506519.
[5]中华人民共和国行业标准编写组.CJJI72004生活垃圾卫生填埋技术规范[S].北京:中国建筑工业出版社,2004.(The Professional Standard Compilation Group of People′s Republic of China.CJJI72004Technical code for municipal solid waste landfills[S].Beijing:China Architecture and Building Press,2004.(in Chinese))
[6]LAMBE T W,WHITMAN R V.Soil mechanics[M].New York:John Wiley and Sons Inc.,1969.
[7]王协群,邹维列,朱瑞赓.渗流作用下垃圾填埋场封盖土坡稳定的极限平衡分析[J].岩石力学与工程学报,2004,23(11):19391943.(WANG Xiequn,ZOU Weilie,ZHU Ruigeng.Stability analysis of cover soil slope on waste landfill under seepage with limit equilibrium method[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(11):19391943.(in Chinese))
[8]杨明亮,骆行文,喻晓,等.金口垃圾填埋场内大型建筑物地基基础及安全性研究[J].岩石力学与工程学报,2005,24(4):628637.(YANG Mingliang,LUO Xingwen,YU Xiao,et al.Research on foundation and security of the edifice in Jinkou municipal refuse landfill[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(4):628637.(in Chinese))
[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):778782.(LIU Jun,KONG Xianjing.Seismic stability and permanent displacement analysis of a solid waste landfill slope containing geomembrane[J].Rock and Soil Mechanics,2004,25(5):778782.(in Chinese))
[10]梅其岳,吴世明.山谷型填埋及堆体边坡稳定分析[J].岩土工程学报,2000,22(3):375379.(MEI Qiyue,WU Shiming.Ramp landfilling and slope stability of landfill[J].Chinese Journal of Geotechnical Engineering,2000,22(3):375379.(in Chinese))
[11]冯世进,陈云敏,高广运,等.垃圾坝和界面强度对填埋场沿底部衬垫系统滑动的影响[J].岩石力学与工程学报,2007,26(1):149155.(FENG Shijin,CHEN Yunmin,GAO Guangyun,et al.Effects of retaining wall and interface strength on transnational failure of landfill along underlying lining system[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(1):149155.(in Chinese))
[12]BYRNE R J,KENDALL J,BROWN S.Cause and mechanism of failure of Kettlemen Hills Landfill B19,Phase I[C]//Stability and Performance of Slopes and EmbankmentsII.New York:[s.n.],1992:11881215.
[13]QIAN X D,KOERNER R M.Effect of apparent cohesion on translational failure analyses of landfills[J].Journal of Geotechnical and Geoenvironmental Engineering,2004,130(1):7180.
[14]JONES D R V,DIXON N.Landfill lining stability and integrity:the role of waste settlement[J].Geotextiles and Geomembranes,2005,23(1):2753.
[2]BYRNE R J.Design issues with displacement-softening interfaces in landfill linings[C]//Proceedings of Waste Tech′94[C].Charleston:[s.n.],1994.
[3]FILZ G M,Esterhuizen J B,DUNCAN J M.Progressive failure of lined waste impoundments[J].Journal of Geotechnical and Geoenvironmental Engineering,2001,127(10):841848.
[4]QIAN X D,KOERNER R M,GRAY D H.Translational failure analysis of landfills[J].Journal of Geotechnical and Geoenvironmental Engineering,2003,129(6):506519.
[5]中华人民共和国行业标准编写组.CJJI72004生活垃圾卫生填埋技术规范[S].北京:中国建筑工业出版社,2004.(The Professional Standard Compilation Group of People′s Republic of China.CJJI72004Technical code for municipal solid waste landfills[S].Beijing:China Architecture and Building Press,2004.(in Chinese))
[6]LAMBE T W,WHITMAN R V.Soil mechanics[M].New York:John Wiley and Sons Inc.,1969.
[7]王协群,邹维列,朱瑞赓.渗流作用下垃圾填埋场封盖土坡稳定的极限平衡分析[J].岩石力学与工程学报,2004,23(11):19391943.(WANG Xiequn,ZOU Weilie,ZHU Ruigeng.Stability analysis of cover soil slope on waste landfill under seepage with limit equilibrium method[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(11):19391943.(in Chinese))
[8]杨明亮,骆行文,喻晓,等.金口垃圾填埋场内大型建筑物地基基础及安全性研究[J].岩石力学与工程学报,2005,24(4):628637.(YANG Mingliang,LUO Xingwen,YU Xiao,et al.Research on foundation and security of the edifice in Jinkou municipal refuse landfill[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(4):628637.(in Chinese))
[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):778782.(LIU Jun,KONG Xianjing.Seismic stability and permanent displacement analysis of a solid waste landfill slope containing geomembrane[J].Rock and Soil Mechanics,2004,25(5):778782.(in Chinese))
[10]梅其岳,吴世明.山谷型填埋及堆体边坡稳定分析[J].岩土工程学报,2000,22(3):375379.(MEI Qiyue,WU Shiming.Ramp landfilling and slope stability of landfill[J].Chinese Journal of Geotechnical Engineering,2000,22(3):375379.(in Chinese))
[11]冯世进,陈云敏,高广运,等.垃圾坝和界面强度对填埋场沿底部衬垫系统滑动的影响[J].岩石力学与工程学报,2007,26(1):149155.(FENG Shijin,CHEN Yunmin,GAO Guangyun,et al.Effects of retaining wall and interface strength on transnational failure of landfill along underlying lining system[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(1):149155.(in Chinese))
[12]BYRNE R J,KENDALL J,BROWN S.Cause and mechanism of failure of Kettlemen Hills Landfill B19,Phase I[C]//Stability and Performance of Slopes and EmbankmentsII.New York:[s.n.],1992:11881215.
[13]QIAN X D,KOERNER R M.Effect of apparent cohesion on translational failure analyses of landfills[J].Journal of Geotechnical and Geoenvironmental Engineering,2004,130(1):7180.
[14]JONES D R V,DIXON N.Landfill lining stability and integrity:the role of waste settlement[J].Geotextiles and Geomembranes,2005,23(1):2753.
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