地震作用下加筋土路基力学行为的弹塑性分析
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摘要
就地震作用下加筋土路基的力学行为进行了分析.计算时土体选用能考虑动载作用下土体中孔隙水压力的变化等因素影响Finn弹塑性动本构模型,土体与筋材的相互作用通过筋土界面模型进行模拟,采用Biot动力固结理论描述土体在流体与动力相互作用下的力学特征.然后利用该模型分析了在地震荷载作用下,加筋与不加筋土路基的侧向位移、沉降与土体中孔隙水压力分布的特点.结果表明:土体加筋可以在一定程度上缓解地震对路基产生的破坏作用.该方法简单实用,且模型中的参数可以通过常规的土工试验获得.对分析地震荷载作用加筋土路基的力学行为有很好的指导作用.
The paper presents an analysis of the mechanic characteristics of reinforced subgrade under seismic loading.The soil is simulated by Finn elastic-plasticity dynamic constitutive model with the consideration of the influence of change of pore pressure.The interaction between soil and reinforced material is simulated by interface model.The mechanic characteristic of reinforced subgrade under the action of fluid and dynamic loading is depicted by Biot dynamic consolidation theory.An analysis is made of the characteristics of lateral displacements,settlements of subgrade,the variety of pore pressure in the soil under seismic loading based on the model.Results show that reinforcement in soil can reduce the damage of seismic loading to subgrade to a degree.This method is simple and practica.The parameters in this model can also be obtained by general geotechnical experiments.This paper is instructive in the analyzing of the mechanic characteristic of reinforced subgrade under seismic loading.
The paper presents an analysis of the mechanic characteristics of reinforced subgrade under seismic loading.The soil is simulated by Finn elastic-plasticity dynamic constitutive model with the consideration of the influence of change of pore pressure.The interaction between soil and reinforced material is simulated by interface model.The mechanic characteristic of reinforced subgrade under the action of fluid and dynamic loading is depicted by Biot dynamic consolidation theory.An analysis is made of the characteristics of lateral displacements,settlements of subgrade,the variety of pore pressure in the soil under seismic loading based on the model.Results show that reinforcement in soil can reduce the damage of seismic loading to subgrade to a degree.This method is simple and practica.The parameters in this model can also be obtained by general geotechnical experiments.This paper is instructive in the analyzing of the mechanic characteristic of reinforced subgrade under seismic loading.
引文
[1]Yogendrakumar M,Bathurst R J,Finn W D L.Dynamic responseanalysis of reinforced-soil retaining wall[J].J Geotech Engng DivASCE,1992,118(8):1158.
[2]Darrasse R J,Bachus C,Giroud J P.Hyperbolic expression forsoil-geosynthetic or geosynthetic-geosynthetic interface shearstrength[J].Geotextiles and Geomembranes,1993,12(3):275.
[3]Cai Zhenqi,Richard J Bathurst.Seismic response analysis ofgeosynthetic reinforced soil segmental retaining walls by finiteelement method[J].Computers and Geotechnics,1995,17(4):523.
[4]Bathurst R J,Hatami K.Seismic response analysis of a geosyn-thetic-reinforced soil retaining wall[J].Geosynthetics Interna-tional,IFAI,1998,5:127.
[5]杨明.加筋土挡墙的作用机理研究及其动力分析[D].重庆:重庆大学土木工程学院,2001.YANG Ming.Mechanism of reinforced wall and dynamic analysis[D].Chongqing:Chongqing University.School of Civil Engi-neering,2001.
[6]谢婉丽.黄土地区高填方加筋土路堤变形及稳定性分析[D].西安:西北大学地质学系,2004.XIE Wanli.Deformation and stability analysis of reinforced highembankment in the Loess Region[D].Xi’an:Northwest Univer-sity.Department of Geology,2004.
[7]Liam Finn W D,Kwok Lee W,Martin Geoffery R.An effectivestress model for liquefaction[J].Journal of the GeotechnicalEngineering Divison,ASCE,1977,103:517.
[8]Hardin B C,Drenevich V P.Shear modulus and damping in soil[J].JSMFD,ASCE,1972,102:667.
[9]Martin G R,Finn W D L,Seed H B.Fundamentals of liquefica-tion under cyclic loading[J].JGED,ASCE,1975.101:423.
[10]朱百里,沈珠江.计算土力学[M].上海:上海科学技术出版社,1990.ZHU Baili,SHEN Zhujiang.Calculation soil mechanics[M].Shanghai:Shanghai Scientific and Technical Publishers,1990.
[2]Darrasse R J,Bachus C,Giroud J P.Hyperbolic expression forsoil-geosynthetic or geosynthetic-geosynthetic interface shearstrength[J].Geotextiles and Geomembranes,1993,12(3):275.
[3]Cai Zhenqi,Richard J Bathurst.Seismic response analysis ofgeosynthetic reinforced soil segmental retaining walls by finiteelement method[J].Computers and Geotechnics,1995,17(4):523.
[4]Bathurst R J,Hatami K.Seismic response analysis of a geosyn-thetic-reinforced soil retaining wall[J].Geosynthetics Interna-tional,IFAI,1998,5:127.
[5]杨明.加筋土挡墙的作用机理研究及其动力分析[D].重庆:重庆大学土木工程学院,2001.YANG Ming.Mechanism of reinforced wall and dynamic analysis[D].Chongqing:Chongqing University.School of Civil Engi-neering,2001.
[6]谢婉丽.黄土地区高填方加筋土路堤变形及稳定性分析[D].西安:西北大学地质学系,2004.XIE Wanli.Deformation and stability analysis of reinforced highembankment in the Loess Region[D].Xi’an:Northwest Univer-sity.Department of Geology,2004.
[7]Liam Finn W D,Kwok Lee W,Martin Geoffery R.An effectivestress model for liquefaction[J].Journal of the GeotechnicalEngineering Divison,ASCE,1977,103:517.
[8]Hardin B C,Drenevich V P.Shear modulus and damping in soil[J].JSMFD,ASCE,1972,102:667.
[9]Martin G R,Finn W D L,Seed H B.Fundamentals of liquefica-tion under cyclic loading[J].JGED,ASCE,1975.101:423.
[10]朱百里,沈珠江.计算土力学[M].上海:上海科学技术出版社,1990.ZHU Baili,SHEN Zhujiang.Calculation soil mechanics[M].Shanghai:Shanghai Scientific and Technical Publishers,1990.
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