附加压重下复合地基地震变形研究
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摘要
碎石桩复合地基抗液化效果研究主要集中在强度方面,从抗震安全性角度来看,还应包括变形问题,主要用有限差分法开展了地震作用下碎石桩复合地基地震液化特性及变形研究。在动力分析中充分考虑孔隙水与土之间的耦合。分析了碎石桩复合地基上部存在不同的附加压重情况下,受El-Centro地震波作用下地基中孔压比的发展及桩间土变形时程。结果表明,碎石桩复合地基在承载力范围内,复合地基上部荷载越大,可以有效减小地基在地震动荷载作用下产生的超孔隙水压力。但是,随着上部荷载的增大,地震期间会产生较大的竖向沉降变形,而地震结束后固结沉降较小。
So far,the research concerning the anti-liquefaction effect of the stone column composite foundation mainly focuses on the strength.However,as far as the safety of anti-earthquake is concerned,the problem of deformation should also be taken into consideration.The present thesis researches the liquefaction and deformation of the stone column composite foundation under the action of earthquake by mainly using the finite difference method and fully considers the coupling between pore water and earth in the dynamic analysis.The thesis analyzes pore pressure ratio development of the foundation and deformation time-history of inter-pile soil of various depths,when the stone column composite foundation is effected by El-Centro earthquake wave and with different additional loading conditions.The results show that within the foundation bearing capacity,the increase of the load on the upper part of the composite foundation can effectively reduce the excess pore water pressure of the foundation generated by the effect of dynamic load during earthquake.However,with the increase of the load on the upper part,there will be bigger vertical settlement and lateral deformation during strong earthquake.And after the earthquake,the post-earthquake settlement will decrease consequently.
So far,the research concerning the anti-liquefaction effect of the stone column composite foundation mainly focuses on the strength.However,as far as the safety of anti-earthquake is concerned,the problem of deformation should also be taken into consideration.The present thesis researches the liquefaction and deformation of the stone column composite foundation under the action of earthquake by mainly using the finite difference method and fully considers the coupling between pore water and earth in the dynamic analysis.The thesis analyzes pore pressure ratio development of the foundation and deformation time-history of inter-pile soil of various depths,when the stone column composite foundation is effected by El-Centro earthquake wave and with different additional loading conditions.The results show that within the foundation bearing capacity,the increase of the load on the upper part of the composite foundation can effectively reduce the excess pore water pressure of the foundation generated by the effect of dynamic load during earthquake.However,with the increase of the load on the upper part,there will be bigger vertical settlement and lateral deformation during strong earthquake.And after the earthquake,the post-earthquake settlement will decrease consequently.
引文
[1]张艳美.碎石桩设计参数对复合地基抗液化性能的影响[J].岩土力学,2008,29(5):1330-1333.
[2]张艳美.碎石桩复合地基抗液化性能数值模拟及应用研究[D].北京:北京交通大学,2006.
[3]黄春霞.碎石桩复合地基抗液化性能试验研究[D].北京:北京交通大学,2005.
[4]Adalier K,Elgamal A.Mitigation of Liquefation and AssociatedGround Deformations by Stone Column.sEngineering Geology,2004,72(3-4):275-291.
[5]Baez J I,Martin G R.Advances in the Design of Vibro Systems for theImprovement of Liquefaction Resistance[C].Symposium of GroundImprovement,Vancouver Geotechnical Society.Vancouver:1993.
[6]柳煀羲彦,落合真.诚水门置换砂の液化预测と对策[J].土と基础,1975,23(6):11-16.
[7]Baez J.IA Design Model for the Reduction of soil Liquefactionby Vibro-Stone Columns[D.]Los Angeles:University of South-ern California,Los Angeles,CA,1995.
[8]谢定义.土动力学[M].西安:西安交通大学出版社,1987.
[9]周建等.土动力学理论与计算[M].北京:中国建筑工业出版社,2001.
[10]陈育民.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2008.
[11]刘华北,宋二祥,可液化土中地铁结构的地震响应[J].岩土力学,2005,26(3):381-391.
[12]刘波,韩彦辉.FLAC原理、实例与应用指南[M].北京:人民交通出版社,2005.
[13]何广讷,王大为.岩土工程技术新进展[M].北京:冶金工业出版社,1999.
[2]张艳美.碎石桩复合地基抗液化性能数值模拟及应用研究[D].北京:北京交通大学,2006.
[3]黄春霞.碎石桩复合地基抗液化性能试验研究[D].北京:北京交通大学,2005.
[4]Adalier K,Elgamal A.Mitigation of Liquefation and AssociatedGround Deformations by Stone Column.sEngineering Geology,2004,72(3-4):275-291.
[5]Baez J I,Martin G R.Advances in the Design of Vibro Systems for theImprovement of Liquefaction Resistance[C].Symposium of GroundImprovement,Vancouver Geotechnical Society.Vancouver:1993.
[6]柳煀羲彦,落合真.诚水门置换砂の液化预测と对策[J].土と基础,1975,23(6):11-16.
[7]Baez J.IA Design Model for the Reduction of soil Liquefactionby Vibro-Stone Columns[D.]Los Angeles:University of South-ern California,Los Angeles,CA,1995.
[8]谢定义.土动力学[M].西安:西安交通大学出版社,1987.
[9]周建等.土动力学理论与计算[M].北京:中国建筑工业出版社,2001.
[10]陈育民.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2008.
[11]刘华北,宋二祥,可液化土中地铁结构的地震响应[J].岩土力学,2005,26(3):381-391.
[12]刘波,韩彦辉.FLAC原理、实例与应用指南[M].北京:人民交通出版社,2005.
[13]何广讷,王大为.岩土工程技术新进展[M].北京:冶金工业出版社,1999.
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