饱和填土稳定渗流条件下动主动土压力计算
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摘要
地震力和地下水渗流共同作用条件下的饱和填土土压力的计算问题是土力学中土压力课题研究的热点和难点所在。对地下水渗流流线为竖直向下的稳定渗流(问题1)和流线弯曲、地下水从挡土墙排出的稳定渗流(问题2)2种简化状态,基于拟静力法和库仑土压力理论,建立了动主动土压力的计算公式。通过和前人研究的对比分析,验证了该计算公式的可靠性,讨论了填土内摩擦角对动主动土压力的影响。结果表明,总动主动土压力随填土有效内摩擦角的增大均呈非线性减小变化,且问题2的总主动土压力随有效内摩擦角增大的减小变化更显著。
To calculate the earth pressure in saturated soil mass subjected to earthquake forces and groundwater seepage,two cases,in which the seepage states are steady but the shapes of the flow lines are different,are investigated.The two cases are Case 1,in which the flow line is vertical downward,and Case 2,in which the flow line is curve toward retaining wall.Based on the pseudo-static method and Coulomb's theory,the formula to calculate the seismic active earth pressures in Cases 1 and 2 is proposed.The comparison of the results with the published work indicates that the suggested formula is reasonable.The influence of the soil effective internal friction angle on the seismic active earth pressure is also discussed.The results indicate that the total seismic active earth pressure is decreasing nonlinearly with the increase of the soil effective internal friction angle.And the decrement of the total seismic active earth pressure in Case 2 is larger than that in Case 1.
To calculate the earth pressure in saturated soil mass subjected to earthquake forces and groundwater seepage,two cases,in which the seepage states are steady but the shapes of the flow lines are different,are investigated.The two cases are Case 1,in which the flow line is vertical downward,and Case 2,in which the flow line is curve toward retaining wall.Based on the pseudo-static method and Coulomb's theory,the formula to calculate the seismic active earth pressures in Cases 1 and 2 is proposed.The comparison of the results with the published work indicates that the suggested formula is reasonable.The influence of the soil effective internal friction angle on the seismic active earth pressure is also discussed.The results indicate that the total seismic active earth pressure is decreasing nonlinearly with the increase of the soil effective internal friction angle.And the decrement of the total seismic active earth pressure in Case 2 is larger than that in Case 1.
引文
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[19]WANG J J,CHAI H J,ZHU J G,et al.Static andseismic passive resistance in saturated backfill[C]//Proceedings of the 12th International Symposium onWater-Rock Interaction,2007,2:1411-1415.
[2]SOUBRA A H.Static and seismic passive earthpressure coefficients on rigid retaining structures[J].Canada Geotechnical Journal,2000,37:463-478.
[3]王俊杰,柴贺军.车辆荷载下饱和路基挡墙主动土压力计算[J].岩土工程学报,2008,30(3):372-378.WANG JUN-JIE,CHAI HE-JUN.Active earth pressureinduced by saturated subgrade under vehicle load[J].Chinese Journal of Geotechnical Engineering,2008,30(3):372-378.
[4]卢廷浩.土力学[M].2版.南京:河海大学出版社,2005.
[5]BARROS P L A.A coulomb-type solution for activeearth thrust with seepage[J].G啨otechnique,2006,56(3):159-164.
[6]BENMEBAREK N,BENMEBAREK S,KASTNER R,et al.Passive and active earth pressure in the presenceof groundwater flow[J].G啨otechnique,2006,56(3):149-158.
[7]王俊杰,柴贺军.饱和填土Rankine被动土压力计算[J].重庆交通大学学报:自然科学版,2008,27(2):259-263.WANG JUN-JIE,CHAI HE-JUN.Rankine-type solutionsfor passive earth pressure in saturated backfill[J].Journalof Chongqing Jiaotong University:Natural Science,2008,27(2):259-263.
[8]WANG JUN-JIE,CHAI HE-JUN,LIN XIN,et al.Coulomb-type solutions for passive earth pressure withsteady seepage[J].Frontiers of Architecture and CivilEngineering in China,2008,2(1):56-66.
[9]STEEDMAN R S,ZENG X.The influence of phase onthe calculation of pseudo-static earth pressure on aretaining wall[J].G啨otechnique,1990,40(3):417-431.
[10]SOUBRA A H.Static and seismic passive earthpressure coefficients on rigid retaining structures[J].Can.Geotech.J.,2000,37:463-478.
[11]ZENG X,STEEDMAN R S.On the behavior of quaywall in earthquakes[J].G啨otechnique,1993,43(3):417-431.
[12]DAS B M,PURI V K.Static and dynamic active earthpressure[J].Geotechnical and Geological Engineering,1996,14(4):353-366.
[13]CHOUDHURY D,NI MBALKAR S.Seismic passiveresistance by pseudo-dynamic method[J].G啨otechnique,2005,55(9):699-702.
[14]RAO K S S,CHOUDHURY D.Seismic passive earthpressure in soils[J].Journal of Geotechnical andGeoenvironment Engineering,ASCE,2005,131(1):131-135.
[15]CHOUDHURY D,NI MBALKAR S.Pseudo-dynamicapproach of seismic active earth pressure behindretaining wall[J].Geotechnical and GeologicalEngineering,2006,24(5):1103-1113.
[16]EBELING R M,MORRISON E E Jr.The seismicdesign of waterfront retaining structures[R].US ArmyTechnical Report ITL-92-11 and US Navy TechnicalReport NCEL TR-939,1992.
[17]KRAMER S L.Geotechnical Earthquake Engineering[M].Prentice Hall,NewJersey,1996.
[18]WANG J J,ZHANG H P,CHAI H J,et al.Seismicpassive resistance with vertical seepage and surcharge[J].Soil Dynamics and Earthquake Engineering,2008,28:728-737.
[19]WANG J J,CHAI H J,ZHU J G,et al.Static andseismic passive resistance in saturated backfill[C]//Proceedings of the 12th International Symposium onWater-Rock Interaction,2007,2:1411-1415.
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