地震荷载作用下双层填土的主动土压力计算
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摘要
针对挡土墙后为成层黏性填土的情况,提出一种地震土压力计算方法.在Mononobe-Okabe理论的基本假定下,考虑了填土黏聚力及墙土接触面上的黏着力,推导出双层填土的地震主动土压力计算表达式.在单层无黏性填土条件下,该公式可以退化为Mononobe-Okabe公式.参数分析结果表明:地震主动土压力随水平地震加速度的增大而增大,随竖向地震加速度的增大而减小;水平向和竖向地震荷载对土压力值的影响显著.算例分析结果表明原有的分层法计算得到的地震土压力值是偏大的.
An advanced computation approach was presented to study the seismic active earth pressure on retaining wall with two-layer cohesive backfill.Based on the assumption of Mononobe-Okabe theory,the expression for the total seismic active earth pressure was derived.The cohesion force on the sliding plane and the adhesive force on the interface of backfill and retaining wall were considered in the analysis.The developed formula can be degenerated to Mononobe-Okabe earth pressure expression for the case of homogeneous cohesiveless soil backfill.The parametric study shows that the seismic active earth pressure increases with the increase of horizontal seismic acceleration coefficient,while it decreases with the increase of vertical seismic acceleration coefficient.Both horizontal and vertical seismic inertia forces have significant effect on the value of seismic active force.Compared with the results of other methods for calculating the seismic earth pressure,the value of seismic active force obtained from the present study is lower than that of the layer method for the same parameters.
An advanced computation approach was presented to study the seismic active earth pressure on retaining wall with two-layer cohesive backfill.Based on the assumption of Mononobe-Okabe theory,the expression for the total seismic active earth pressure was derived.The cohesion force on the sliding plane and the adhesive force on the interface of backfill and retaining wall were considered in the analysis.The developed formula can be degenerated to Mononobe-Okabe earth pressure expression for the case of homogeneous cohesiveless soil backfill.The parametric study shows that the seismic active earth pressure increases with the increase of horizontal seismic acceleration coefficient,while it decreases with the increase of vertical seismic acceleration coefficient.Both horizontal and vertical seismic inertia forces have significant effect on the value of seismic active force.Compared with the results of other methods for calculating the seismic earth pressure,the value of seismic active force obtained from the present study is lower than that of the layer method for the same parameters.
引文
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[9]EVANGELISTA A,SANTOLO A S,SIMONELLI A L.Evaluation of pseudostatic active earth pressure coefficient ofcantilever retaining walls[J].Soil Dynamics and EarthquakeEngineering,2010,30(11):1119-1128.
[10]STEEDMAN R S,ZENG X.The influence of phase onthe calculation of pseudo-static earth pressure on a re-taining wall[J].Geotechnique,1990,40(1):103-112.
[11]GRECO V R.Pseudo-static analysis for earth thrust compu-tations[J].Soils and Foundations,2003,43(2):135-138.
[12]KUMAR J,CHITIKELA S.Seismic earth passivepressure coefficients using the method of characteris-tics[J].Canadian Geotechnical Journal,2002,39(2),463-471.
[13]RAO K S S,CHOUDHURY D.Seismic passive earth pres-sures in soils[J].Journal of Geotechnical and Geoenvironmen-tal Engineering,ASCE,2009,131(1):131-135.
[14]DEWAIKAR D M,HALKUDE S A.Seismic passive/active thrust on retaining wall-point of application[J].Soils and Foundations,2002,42(1):9-15.
[15]胡晓军.黏性成层填土的主动土压力[J].哈尔滨工业大学学报,2009,41(4):185-188.HU Xiao-jun.Active earth pressure of retaining wallwith multiple layers of cohesive soil[J].Journal ofHarbin Institute of Technology,2009,41(4):185-188.
[2]DEWOOLKAR M M,KO H Y,PAK R Y S.Experi-mental developments for studying static and seismic be-havior of retaining walls with liquefiable backfills[J].Soil Dynamics and Earthquake Engineering,2000,19(8):583-593.
[3]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 Li-qiang,WANG Yuan-zhan,CHI Li-hua.Dis-tribution of seismic soil pressure on a retaining wall[J].China Harbour Engineering,2007(5):1-5.
[4]SHUKLA S K,GUPTA S K,SIVAKUGAN N.Activeearth oressure on retaining wall for c-φsoil backfill underseismic loading condition[J].Journal of Geotechnical andGeoenvironmental Engineering,ASCE,2009,135(5):690-696.
[5]SARAN S,GUPTA R P.Seismic earth pressures be-hind retaining walls[J].Indian Geotechnical Journal,2003,33(3):195-213.
[6]RICHARDS R,SHI X.Seismic lateral pressures in soilwith cohesion[J].Journal of Geotechnical Engineering,1994,120(7):1230-1251.
[7]WANG Y Z.Distribution of earth pressure on a retai-ning wall[J].Geotechnique,2000,50(1):83-88.
[8]王奎华,马少俊,刘骏龙,等.一种包含库仑和朗肯理论的土压力计算方法[J].浙江大学学报:工学版,2010,44(5):969-975.WANG Kui-hua,MA Shao-jun,LIU Jun-long,et al.Generic algorithm for earth pressure involving Coulomband Rankine pressure theory[J].Journal of ZhejiangUniversity:Engineering Science,2010,44(5):969-975.
[9]EVANGELISTA A,SANTOLO A S,SIMONELLI A L.Evaluation of pseudostatic active earth pressure coefficient ofcantilever retaining walls[J].Soil Dynamics and EarthquakeEngineering,2010,30(11):1119-1128.
[10]STEEDMAN R S,ZENG X.The influence of phase onthe calculation of pseudo-static earth pressure on a re-taining wall[J].Geotechnique,1990,40(1):103-112.
[11]GRECO V R.Pseudo-static analysis for earth thrust compu-tations[J].Soils and Foundations,2003,43(2):135-138.
[12]KUMAR J,CHITIKELA S.Seismic earth passivepressure coefficients using the method of characteris-tics[J].Canadian Geotechnical Journal,2002,39(2),463-471.
[13]RAO K S S,CHOUDHURY D.Seismic passive earth pres-sures in soils[J].Journal of Geotechnical and Geoenvironmen-tal Engineering,ASCE,2009,131(1):131-135.
[14]DEWAIKAR D M,HALKUDE S A.Seismic passive/active thrust on retaining wall-point of application[J].Soils and Foundations,2002,42(1):9-15.
[15]胡晓军.黏性成层填土的主动土压力[J].哈尔滨工业大学学报,2009,41(4):185-188.HU Xiao-jun.Active earth pressure of retaining wallwith multiple layers of cohesive soil[J].Journal ofHarbin Institute of Technology,2009,41(4):185-188.
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