刚性挡土墙地震主动土压力的拟动力学分析
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摘要
采用拟动力学方法的基本假定,考虑地震加速度的放大效应,利用水平层分析法,求得在地震荷载作用下随地震时间变化的主动土压力强度的分布解.将最危险滑动面倾角和合力作用点高度与传统方法进行比较,分析合力作用点时程曲线的特征,探讨水平加速度系数及加速度放大系数对土压力分布的影响.结果表明:采用该方法计算得到的滑动面倾角和合力作用点高度大于传统方法计算值;合力作用点高度在地震时是不断变化的;水平地震加速度系数及加速度放大系数均对土压力分布有很大影响,不考虑加速度的放大效应是偏于危险的.
The effect of amplification of seismic accelerations was considered and a level-layer analysis method was suggested in order to obtain the theoretical formula for the distribution of active earth pressure under seismic loads based on the basic hypothesis of pseudo-dynamic method.The inclination of the most dangerous slip surface and the location of resultant force were compared with those of the traditional method.The effects of horizontal seismic acceleration coefficient and amplification factor on the distribution of seismic active earth pressure were analyzed.Results show that the values of the inclination of the most dangerous slip surface and the location of resultant force are larger than those obtained by the traditional methods.The location of resultant force is always changing during the earthquake.The horizontal seismic acceleration coefficient and the amplification factor significantly impact on the distribution of seismic active earth pressure,so it is dangerous to ignore the effect of amplification of seismic accelerations.
The effect of amplification of seismic accelerations was considered and a level-layer analysis method was suggested in order to obtain the theoretical formula for the distribution of active earth pressure under seismic loads based on the basic hypothesis of pseudo-dynamic method.The inclination of the most dangerous slip surface and the location of resultant force were compared with those of the traditional method.The effects of horizontal seismic acceleration coefficient and amplification factor on the distribution of seismic active earth pressure were analyzed.Results show that the values of the inclination of the most dangerous slip surface and the location of resultant force are larger than those obtained by the traditional methods.The location of resultant force is always changing during the earthquake.The horizontal seismic acceleration coefficient and the amplification factor significantly impact on the distribution of seismic active earth pressure,so it is dangerous to ignore the effect of amplification of seismic accelerations.
引文
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[15]王元战,李新国,陈楠楠.挡土墙主动土压力分布与侧压力系数[J].岩土力学,2005,26(7):1019-1022.WANG Yuan-zhan,LI Xin-guo,CHEN Nan-nan.Active earth pressure on a retaining wall and lateral co-efficient of earth pressure[J].Rock and Soil Mechan-ics,2005,26(7):1019-1022.
[2]RICHARDS R,HUANG C,FISHMAN K L.Seismicearth pressure on retaining structure[J].Journal ofGeotechnical and Geoenvironmental Engineering,1999,125(9):771-778.
[3]CHOUDHURY D,SINGH S.New approach for esti-mation of static and seismic active earth pressure[J].Journal of Geotechnical and Geological Engineering,2006,24(1):117-127.
[4]刘忠玉,杨会朋,何盛东.刚性挡土墙地震土压力的非线性分布[J].郑州大学学报:工学版,2004,25(2):36-38.LIU Zhong-yu,YANG Hui-peng,HE Sheng-dong.Nonlinear distribution of seismic active earth pressure onrigid retaining walls[J].Journal of Zhengzhou Universi-ty:Engineering Science,2004,25(2):36-38.
[5]王立强,王元战,迟丽华.挡土墙地震土压力及其分布[J].中国港湾建设,2007,151(5):1-5.WANG Li-qiang,WANG Yuan-zhan,CHI Li-hua.Dis-tribution of seismic soil pressure on a retaining wall[J].China Harbour Engineering,2007,151(5):1-5.
[6]STEEDMAN R S,ZENG X.The influence of phase onthe calculation of pseudo-static earth pressure on a retai-ning wall[J].Geotechnique,1990,40(1):103-112.
[7]CHOUDHURY D,NIMBALKAR S.Pseudo-dynamicapproach of seismic active earth pressure behind retai-ning wall[J].Journal of Geotechnical Geological Engi-neering,2006,24(1):1103-1113.
[8]GHOSH P.Seismic active earth pressure behind a nonverti-cal retaining wall using pseudo-dynamic analysis[J].Cana-dian Geotechnical Journal,2008,45(1):117-123.
[9]KOLATHAYAR S,GHOSH P.Seismic active earthpressure on walls with bilinear backface using peudo-dynamic approach[J].Computers and Geotechnics,2009,36(1):1229-1236.
[10]AZAD A,YASROBI S S,PAK A.Seismic activepressure distribution history behind rigid retainingwalls[J].Soil Dynamics and Earthquake Engineering,2008,28(1):365-375.
[11]顾慰慈.挡土墙土压力计算[M].北京:中国建材工业出版社,2001:235.
[12]蒋波,应宏伟,谢康和.挡土墙后土体拱效应分析[J].浙江大学学报:工学版,2005,39(1):131-136.JIANG Bo,YING Hong-wei,XIE Kang-he.Analysisof soil arching behind retaining wall[J].Journal ofZhejiang University:Engineering Science,2005,39(1):131-136.
[13]吴明.深基坑工程若干土力学问题研究[D].杭州:浙江大学,2009.WU Ming.Study on some problems of soil mechanicsin deep excavation engineering[D].Hangzhou:Zhe-jiang University,2009.
[14]SEED H B,WHITMAN R V.Design of earth retai-ning structures for dynamics loads[C]∥Proceedings ofthe ASCE Special Conference on Lateral Stresses,Ground Displacement and Earth Retaining Structure.Ithaca,New York:ASCE,1970.
[15]王元战,李新国,陈楠楠.挡土墙主动土压力分布与侧压力系数[J].岩土力学,2005,26(7):1019-1022.WANG Yuan-zhan,LI Xin-guo,CHEN Nan-nan.Active earth pressure on a retaining wall and lateral co-efficient of earth pressure[J].Rock and Soil Mechan-ics,2005,26(7):1019-1022.
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