挡土墙后黏性土的地震主动土压力分析
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摘要
在Mononobe-Okabe平面滑裂面假设的基础上,考虑地震加速度的放大效应,运用拟动力学的分析方法,得到考虑时间和相位变化的刚性挡土墙后黏性土地震主动土压力系数、地震主动土压力合力和主动土压力分布强度的理论公式。在此基础上,利用优化算法得到地震卓越周期中的最不利工况,分析水平和竖向地震加速度系数、内摩擦角、墙面摩擦角、挡土墙倾角和地震放大系数对最不利工况下滑动面倾角、主动土压力系数、临界深度、合力作用点和土压力分布的影响。研究表明:地震主动土压力分布为非线性;地震加速度的存在大大增加黏性土的主动土压力;挡土墙倾角和地震放大效应对临界深度、合力作用点和土压力分布都有着明显影响。
Based on the planar rupture surfaces hypothesis of Mononobe-Okabe theory,considering the effect of amplification of seismic accelerations and using the pseudo-dynamics method,the seismic active earth pressure coefficient,the resultant force of seismic active earth pressure and the distribution of active earth pressure on a rigid retaining wall supporting cohesive backfill are obtained respectively.Time and phase changes within the backfill are also considered.On this basis,the most unfavorable conditions are investigated by an optimization algorithm.Then the effects of horizontal and vertical seismic accelerations,internal fiction angle,wall friction angle,retaining wall angle and amplification on the inclination of the slip surface on active earth pressure coefficient,critical depth,the location of resultant force and the distribution of active earth pressure are discussed.The results show that the distribution of seismic active earth pressure is nonlinear.The existence of seismic acceleration induces a considerable increase in the active earth pressure of cohesive soil.The retaining wall angle and amplification effect of seismic accelerations have obvious influences on the critical depth,location of resultant force and distribution of passive earth pressure.
Based on the planar rupture surfaces hypothesis of Mononobe-Okabe theory,considering the effect of amplification of seismic accelerations and using the pseudo-dynamics method,the seismic active earth pressure coefficient,the resultant force of seismic active earth pressure and the distribution of active earth pressure on a rigid retaining wall supporting cohesive backfill are obtained respectively.Time and phase changes within the backfill are also considered.On this basis,the most unfavorable conditions are investigated by an optimization algorithm.Then the effects of horizontal and vertical seismic accelerations,internal fiction angle,wall friction angle,retaining wall angle and amplification on the inclination of the slip surface on active earth pressure coefficient,critical depth,the location of resultant force and the distribution of active earth pressure are discussed.The results show that the distribution of seismic active earth pressure is nonlinear.The existence of seismic acceleration induces a considerable increase in the active earth pressure of cohesive soil.The retaining wall angle and amplification effect of seismic accelerations have obvious influences on the critical depth,location of resultant force and distribution of passive earth pressure.
引文
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[10]STEEDMAN R S,ZENG X.The influence of phase on thecalculation of pseudo-static earth pressure on a retaining wall[J].Geotechnique,1990,40(1):103–112.
[11]CHOUDHURY D,NIMBALKAR S S.Pseudo-dynamic approach ofseismic active earth pressure behind retaining wall[J].GeotechnicalGeological Engineering,2006,24(5):1 103–1 113.
[12]GHOSH P.Seismic active earth pressure behind a nonverticalretaining wall using pseudo-dynamic analysis[J].Canadian GeotechnicalJournal,2008,45(1):117–123.
[13]KOLATHAYAR S,GHOSH P.Seismic active earth pressure on wallswith bilinear backface using peudo-dynamic approach[J].Computersand Geotechnics,2009,36(7):1 229–1 236.
[14]AZAD A,YASROBI S S,PAK A.Seismic active pressuredistribution history behind rigid retaining walls[J].Soil Dynamicsand Earthquake Engineering,2008,28(5):365–375.
[15]赵恒惠.挡土墙后黏性填土的土压力计算[J].岩土工程学报,1983,5(1):134–146.(ZHAO Henghui.The computation of earthpressure of cohesive backfill on retaining wall[J].Chinese Journal ofGeotechnical Engineering,1983,5(1):134–146.(in Chinese))
[16]韩立业,陈道政.对黏性土朗肯主动土压力理论中的一个应力的释疑[J].岩石力学与工程学报,2002,21(12):1901–1902.(HANLiye,CHEN Daozheng.Explanation of a stress in the theory ofRankine active earth pressure in clayey soil[J].Chinese Journal ofRock Mechanics and Engineering,2002,21(12):1 901–1 902.(inChinese))
[17]杨剑,高玉峰,程永锋,等.地震条件下倾斜挡土墙被动土压力研究[J].岩土工程学报,2009,31(9):1391–1397.(YANG Jian,GAO Yufeng,CHENG Yongfeng,et al.Passive earth pressure ofinclined retaining walls under seismic condition[J].Chinese Journalof Geotechnical Engineering,2009,31(9):1 391–1 397.(inChinese))
[2]MONONOBE N,MATSUO H.On the determination of earthquakepressure during earthquake[C]//Proceedings of the World EngineeringCongress.[S.l.]:[s.n.],1929:177–185.
[3]SHERIF M A,FANG Y S.Dynamic earth pressures on walls rotatingabout the top[J].Soils and Foundations,1984,24(4):109–117.
[4]RICHARDS R,HUANG C J,FISHMAN K L.Seismic earth pressureon retaining structure[J].Journal of Geotechnical and GeoenvironmentalEngineering,1999,125(9):771–778
[5]CHOUD-HURY D,SINGH S.New approach for estimation of staticand seismic active earth pressure[J].Geotechnical and GeologicalEngineering,2006,24(1):117–127.
[6]朱桐浩.在地震荷载作用下挡土墙主动土压力[J].四川建筑科学研究,1981,(3):37–44.(ZHUTonghao.Seismicactiveearthpressureon a retaining wall[J].Building Science Research of Sichuan,1981,(3):37–44.(in Chinese))
[7]王贻荪,赵明华.地震土压力一般解及其工程应用[J].湖南大学学报:自然科学版,1990,17(4):71–82.(WANG Yisun,ZHAOMinghua.General solution of earthquake-induced soil pressure andits engineering application[J].Journal of Hunan University:NaturalScience,1990,17(4):71–82.(in Chinese))
[8]刘忠玉,杨会朋,何盛东.刚性挡土墙地震主动土压力的非线性分布[J].郑州大学学报:工学版,2004,25(2):36–38.(LIUZhongyu,YANG Huipeng,HE Shengdong.Nonlinear distribution ofseismic active earth pressure on rigid retaining walls[J].Journal ofZhengzhou University:Engineering Science,2004,25(2):36–38.(inChinese))
[9]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,(5):1–5.(WANG Liqiang,WANG Yuanzhan,CHI Lihua.Distribution of seismic soil pressure on a retainingwall[J].China Harbour Engineering,2007,(5):1–5.(in Chinese))
[10]STEEDMAN R S,ZENG X.The influence of phase on thecalculation of pseudo-static earth pressure on a retaining wall[J].Geotechnique,1990,40(1):103–112.
[11]CHOUDHURY D,NIMBALKAR S S.Pseudo-dynamic approach ofseismic active earth pressure behind retaining wall[J].GeotechnicalGeological Engineering,2006,24(5):1 103–1 113.
[12]GHOSH P.Seismic active earth pressure behind a nonverticalretaining wall using pseudo-dynamic analysis[J].Canadian GeotechnicalJournal,2008,45(1):117–123.
[13]KOLATHAYAR S,GHOSH P.Seismic active earth pressure on wallswith bilinear backface using peudo-dynamic approach[J].Computersand Geotechnics,2009,36(7):1 229–1 236.
[14]AZAD A,YASROBI S S,PAK A.Seismic active pressuredistribution history behind rigid retaining walls[J].Soil Dynamicsand Earthquake Engineering,2008,28(5):365–375.
[15]赵恒惠.挡土墙后黏性填土的土压力计算[J].岩土工程学报,1983,5(1):134–146.(ZHAO Henghui.The computation of earthpressure of cohesive backfill on retaining wall[J].Chinese Journal ofGeotechnical Engineering,1983,5(1):134–146.(in Chinese))
[16]韩立业,陈道政.对黏性土朗肯主动土压力理论中的一个应力的释疑[J].岩石力学与工程学报,2002,21(12):1901–1902.(HANLiye,CHEN Daozheng.Explanation of a stress in the theory ofRankine active earth pressure in clayey soil[J].Chinese Journal ofRock Mechanics and Engineering,2002,21(12):1 901–1 902.(inChinese))
[17]杨剑,高玉峰,程永锋,等.地震条件下倾斜挡土墙被动土压力研究[J].岩土工程学报,2009,31(9):1391–1397.(YANG Jian,GAO Yufeng,CHENG Yongfeng,et al.Passive earth pressure ofinclined retaining walls under seismic condition[J].Chinese Journalof Geotechnical Engineering,2009,31(9):1 391–1 397.(inChinese))
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