平行于水平面表面渗流对生态边坡中客土稳定性影响研究
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摘要
设定平行于水平面表面渗流情况下客土破坏模式为一条沿平面网上表面的平行于原边坡坡面的直线滑动面。根据此破坏模式,采用无限坡模型进行客土的稳定性分析,推导出有地震、平行于水平面表面渗流作用下的客土稳定厚度的通式。通过对通式中参数取值的讨论,给出了各种情况下的客土稳定设计图表。利用平行于水平面表面渗流和平行于坡面表面渗流情况下的客土稳定设计图表,进行了两种情况下客土稳定性的对比。结果表明,客土失稳厚度相同时,平行于水平面表面渗流比平行于坡面表面渗流时的客土稳定性显著降低,且客土失稳厚度越小,客土稳定性的降低更为显著。
Supposing that the failure mode of borrowed soil with surface seepage parallel to horizontal surface is a translational sliding surface parallel to the original sloped surface along the upper surface of plane nets.Based on this failure model,the stability analysis of the soil is carried out;and then a general equation on stability thickness of the soil under earthquake and surface seepage parallel to horizontal surface is given.Stability charts for the soil are obtained after discussion on parameters of the equation.Using the charts with surface seepage parallel to horizontal surface and with surface seepage parallel to sloped surface,the stability of the soil is compared.The result shows the stability of the soil with surface seepage parallel to horizontal surface is remarkably reduced than that with surface seepage parallel to sloped surface,and reduced degree is inversely proportional to instability thickness of the soil.
Supposing that the failure mode of borrowed soil with surface seepage parallel to horizontal surface is a translational sliding surface parallel to the original sloped surface along the upper surface of plane nets.Based on this failure model,the stability analysis of the soil is carried out;and then a general equation on stability thickness of the soil under earthquake and surface seepage parallel to horizontal surface is given.Stability charts for the soil are obtained after discussion on parameters of the equation.Using the charts with surface seepage parallel to horizontal surface and with surface seepage parallel to sloped surface,the stability of the soil is compared.The result shows the stability of the soil with surface seepage parallel to horizontal surface is remarkably reduced than that with surface seepage parallel to sloped surface,and reduced degree is inversely proportional to instability thickness of the soil.
引文
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[3]蒋刚,林鲁生,刘祖德.降雨渗流作用下残积土边坡的数值分析[J].南京工业大学学报,2005,27(5):27-31.JIANG Gang,LIN Lu-sheng,LIU Zu-de.Numerical analysis on residual soil slope under rainfall infiltration[J].Journal of Nanjing University of Technology,2005,27(5):27-31.
[4]毛昶熙.渗流计算分析与控制[M].北京:水利电力出版社,1990.
[5]高小育,廖红建,丁春华.渗流对土质边坡稳定性的影响[J].岩土力学,2004,25(1):69-72.GAO Xiao-yu,LIAO Hong-jian,DING Chun-hua.Seepage effects on soil slope stability[J].Rock and Soil Mechanics,2004,25(1):69-72.
[6]THIEL R S,STEWART M G.Geosynthetic landfill cover design methodology and construction experience in the Pacific northeast[C]//Proceedings of Geosynthetics’93Vancouver.Canada:International Industrial Fabrics Association,1993:1131-1144.
[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,2006,23(11):1939-1943.WANG Xie-qun,ZOU Wei-lie,ZHU Rui-geng.Stability analysis of cover soil slope on waste landfill under seepage with limit equilibrium method[J].Chinese Journal of Rock Mechanics and Engineering,2006,23(11):1939-1943.
[8]SOONG T Y,KOERNER R M.Seepage induced slope instability[J].Geotextiles and Geomembranes,1996,14:425-445.
[9]杨俊杰,王亮,郑建国,等.生态边坡客土稳定性研究[J].岩石力学与工程学报,2006,25(2):414-422.YANG Jun-jie,WANG Liang,ZHENG Jian-guo,et al.Study on stability of borrowed soil in ecological slope[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(2):414-422.
[10]王亮,杨俊杰,刘强,等.表面渗流对生态边坡中客土稳定性研究[J].岩土力学,2008,29(6):1440-1445.WANG Liang,YANG Jun-jie,LIU Qiang,et al.Study on surface seepage effects on stability of borrowed soil in ecological slope[J].Rock and Soil Mechanics,2008,29(6):1440-1445.
[11]中华人民共和国交通部.JTJ004-89公路工程抗震设计规范[S].北京:人民交通出版社,2003.
[12]中国水利水电科学研究院.DL5073-2000水工建筑物抗震设计规范[S].北京:中国电力出版社,2000.
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