碎石桩与水泥土桩加固液化地基的数值模拟研究
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摘要
采用三维有限差分程序FLAC3D(Fast Lagrangian Analysis of Continua)对未加固、碎石桩加固和水泥土桩加固的液化砂土地基进行数值模拟,探讨了碎石桩与水泥土桩加固液化砂土地基的抗液化性能。研究表明碎石桩抗液化能力显著,而水泥土桩抗液化能力十分有限,证实了碎石桩加固液化砂土地基的抗液化效果与桩土共同作用的排水效应直接相关。
Natural liquefiable sandy ground and liquefiable sandy ground improved by gravel piles and soil cement piles under earthquake action are numerically simulated by three-dimensional finite difference program "FLAC3D"(Fast Lagrangian analysis of continua),and anti-liquefaction characteristics of gravel piles and soil-cement piles in improving the liquefiable sandy ground are studied.The analysis shows that the gravel piles have remarkable effect to resist liquefaction,while the cement-soil piles have limit effect to resist liquefaction.It is also confirmed that the resisting liquefaction effects and the drainage effects of pile-soil are directly correlative.
Natural liquefiable sandy ground and liquefiable sandy ground improved by gravel piles and soil cement piles under earthquake action are numerically simulated by three-dimensional finite difference program "FLAC3D"(Fast Lagrangian analysis of continua),and anti-liquefaction characteristics of gravel piles and soil-cement piles in improving the liquefiable sandy ground are studied.The analysis shows that the gravel piles have remarkable effect to resist liquefaction,while the cement-soil piles have limit effect to resist liquefaction.It is also confirmed that the resisting liquefaction effects and the drainage effects of pile-soil are directly correlative.
引文
[1]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2009.(CHEN Yu-min,XUDing-ping.FLAC/FLAC3D basis and project case[M].Beijing:China Water Power Press,2009.(in Chinese))
[2]张明.碎石桩复合地基抗液化性能的数值模拟[D].太原:太原理工大学,2010.(ZHANG Ming.Numerical simulationof anti-liquefaction characteristics of gravel pile compositefoundation[D].Taiyuan:Taiyuan University of Technology,2010.(in Chinese))
[3]郭英.水泥土桩复合地基抗液化特性的数值分析[D].太原:太原理工大学,2010.(GUO Ying.Numerical simulationof anti-liquefaction characteristics of cement pile compositefoundation[D].Taiyuan:Taiyuan University of Technology,2010.(in Chinese))
[4]张艳美,张鸿儒,张旭东.碎石桩复合地基三维地震响应分析[J].工程地质学报,2008,16(1):47–52.(ZHANGYan-mei,ZHANG Hong-ru,ZHANG Xu-dong.Gravel pilecomposite foundation of 3D seismic response analysis[J].Journal of Engineering Geology,2008,16(1):47–52.(inChinese))
[5]牛琪瑛,郭英,吴永娟,等.碎石桩加固不同密实度液化土的孔压比变化规律探讨[J].工程力学,2010,27(增刊1):159–163.(NIU Qi-ying,GUO Ying,WU Yong-juan,et al.Study on pore water pressure variation of different densityliquefiable sand soil reinforced by gravel pile[J].EngineeringMechanics,2010,27(S1):159–163.(in Chinese))
[6]牛琪瑛,张明,杨庆陶.桩体加固液化砂土模型地基沉降分析[J].工程抗震与加固改造,2009,31(6):116–119.(NIU Qi-ying,ZHANG Ming,YANG Qing-tao.Study onsettlement of liquefiable sand soil model improved by pile[J].Earthquake Resistant Engineering and Retrofitting,2009,31(6):116–119.(in Chinese))
[7]杨庆陶,魏剑伟.牛琪瑛.碎石桩复合地基的抗液化研究[C]//第16届全国结构工程学术会议论文集(II),2007:368–37.(YANG Qing-tao,WEI Jian-wei,NIU Qi-ying.Studyon composite foundation of gravel pile for liquefactionresistance[C]//Proceedings of the 16th National Conferenceon Structural Engineering(II),2007:368–372.(in Chinese))
[8]牛琪瑛,张明,刘建君.加固液化砂土地基的数值模拟分析[C]//第19届全国结构工程学术会议论文集Ⅱ,2010:297.(NIU Qi-ying,ZHANG Ming,LIU Jian-jun.Study onnumerical simulation of liquefiable sand soil reinforced bygravel pile[C]//Proceedings of the 19th National Conferenceon Structural Engineering(II),2010:297.(in Chinese))
[9]牛琪瑛,徐增杰.水泥土桩复合地基的抗液化研究[J].工程力学,2009,26(增刊1):67–71.(NIU Qi-ying,XUZeng-jie.Research on liquefaction resistance of compositesubgrade forsoil-cement columns[J].Engineering Mechanics,2009,26(S1):67–71.(in Chinese))
[10]The committee on soil dynamics of geotechnical engineeringdivision,ASCE.Definition of terms related to liquefaction[J].Geotechnical Engineering Div,ASCE,1979,104(GT9):1197–1200.
[11]NIU Qi-ying,YAN Wei-ze,YANG Qing-tao,et al.Study onliquefaction of sandy soil in shaking table test[C]//9thInternational Symposium on Environmental Geotechnologyand Sustainable Development.ALBERT T Yeung,ed.2008:435–441.
[2]张明.碎石桩复合地基抗液化性能的数值模拟[D].太原:太原理工大学,2010.(ZHANG Ming.Numerical simulationof anti-liquefaction characteristics of gravel pile compositefoundation[D].Taiyuan:Taiyuan University of Technology,2010.(in Chinese))
[3]郭英.水泥土桩复合地基抗液化特性的数值分析[D].太原:太原理工大学,2010.(GUO Ying.Numerical simulationof anti-liquefaction characteristics of cement pile compositefoundation[D].Taiyuan:Taiyuan University of Technology,2010.(in Chinese))
[4]张艳美,张鸿儒,张旭东.碎石桩复合地基三维地震响应分析[J].工程地质学报,2008,16(1):47–52.(ZHANGYan-mei,ZHANG Hong-ru,ZHANG Xu-dong.Gravel pilecomposite foundation of 3D seismic response analysis[J].Journal of Engineering Geology,2008,16(1):47–52.(inChinese))
[5]牛琪瑛,郭英,吴永娟,等.碎石桩加固不同密实度液化土的孔压比变化规律探讨[J].工程力学,2010,27(增刊1):159–163.(NIU Qi-ying,GUO Ying,WU Yong-juan,et al.Study on pore water pressure variation of different densityliquefiable sand soil reinforced by gravel pile[J].EngineeringMechanics,2010,27(S1):159–163.(in Chinese))
[6]牛琪瑛,张明,杨庆陶.桩体加固液化砂土模型地基沉降分析[J].工程抗震与加固改造,2009,31(6):116–119.(NIU Qi-ying,ZHANG Ming,YANG Qing-tao.Study onsettlement of liquefiable sand soil model improved by pile[J].Earthquake Resistant Engineering and Retrofitting,2009,31(6):116–119.(in Chinese))
[7]杨庆陶,魏剑伟.牛琪瑛.碎石桩复合地基的抗液化研究[C]//第16届全国结构工程学术会议论文集(II),2007:368–37.(YANG Qing-tao,WEI Jian-wei,NIU Qi-ying.Studyon composite foundation of gravel pile for liquefactionresistance[C]//Proceedings of the 16th National Conferenceon Structural Engineering(II),2007:368–372.(in Chinese))
[8]牛琪瑛,张明,刘建君.加固液化砂土地基的数值模拟分析[C]//第19届全国结构工程学术会议论文集Ⅱ,2010:297.(NIU Qi-ying,ZHANG Ming,LIU Jian-jun.Study onnumerical simulation of liquefiable sand soil reinforced bygravel pile[C]//Proceedings of the 19th National Conferenceon Structural Engineering(II),2010:297.(in Chinese))
[9]牛琪瑛,徐增杰.水泥土桩复合地基的抗液化研究[J].工程力学,2009,26(增刊1):67–71.(NIU Qi-ying,XUZeng-jie.Research on liquefaction resistance of compositesubgrade forsoil-cement columns[J].Engineering Mechanics,2009,26(S1):67–71.(in Chinese))
[10]The committee on soil dynamics of geotechnical engineeringdivision,ASCE.Definition of terms related to liquefaction[J].Geotechnical Engineering Div,ASCE,1979,104(GT9):1197–1200.
[11]NIU Qi-ying,YAN Wei-ze,YANG Qing-tao,et al.Study onliquefaction of sandy soil in shaking table test[C]//9thInternational Symposium on Environmental Geotechnologyand Sustainable Development.ALBERT T Yeung,ed.2008:435–441.
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