碎石桩加固不同密实度液化土的孔隙水压力变化规律探讨
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摘要
通过碎石桩加固液化模型土振动台试验,研究了一定埋深时密实度变化的模型地基土振动过程中孔隙水压力和孔压比的峰值、振动结束后消散程度,揭示了加固与未加固液化土随埋深变化的孔压比与密实度的变化规律,阐明碎石桩加固液化土主要以密实度和排水两因素为主的加固机理,研究结果对今后实际工程碎石桩加固复合地基液化土判断有一定指导意义。
The author performs the shaking table test of liquefied soil improved by gravel pile,and then analyzes pore water pressure as well as its peak ratio during vibration and dissipation.It is demonstrated that the pore pressure ratio at different buried depths changes with density.The mechanism of liquefied soil improved by gravel pile is discussed,which is related to the density and drainage of sand soil.
The author performs the shaking table test of liquefied soil improved by gravel pile,and then analyzes pore water pressure as well as its peak ratio during vibration and dissipation.It is demonstrated that the pore pressure ratio at different buried depths changes with density.The mechanism of liquefied soil improved by gravel pile is discussed,which is related to the density and drainage of sand soil.
引文
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[11]杨庆陶.桩体加固液化砂土的振动台试验研究[D].太原:太原理工大学,2008.Yang Qingtao.The shaking table experimental study on liquefiable sand soil improved by pile[D].Taiyuan:Taiyuan University of Technology,2008.(in Chinese)
[2]杨庆陶,魏剑伟,牛琪瑛.碎石桩复合地基的抗液化研究[C].第十六届全国结构工程学术会议论文集,2007,II:368―372.Yang Qingtao,Wei Jianwei,Niu Qiying.Research on composite foundation of gravel pile for liquefaction resistance[C].Proceedings of the Sixteenth National Conference on Structural Engineering,2007,II:368―372.(in Chinese)
[3]张艳美,张鸿儒.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):1320―1324.Zhang Yanmei,Zhang Hongru.Influence of stone columns design parameters on anti-liquefaction nature of composite foundation[J].Rock and Soil Mechanics,2008,29(5):1320―1324.(in Chinese)
[4]景立平,崔杰,李立云.粉土液化的小型振动台试验研究[J].地震工程与工程振动,2004,24(3):145―151.Jing Liping,Cui Jie,Li Liyun.Small shaking table modeling of silty soil liquefaction[J].Earthquake Engineering and Engineering Vibration,2004,24(3):145―151.(in Chinese)
[5]黄春霞,张鸿儒,隋志龙,靳建军.饱和砂土地基液化特性振动台试验[J].岩土工程学报,2006,28(12):2098―2103.Huang Chunxia,Zhang Hongru,Sui Zhilong,Jin Jianjun.Shaking table tests on liquefaction properties of saturated sand ground[J].Chinese Journal of Geotechnical Engineering,2006,28(12):2098―2103.(in Chinese)
[6]Niu Qi-ying,Yan Wei-ze,Yang Qing-tao,Wei Jian-wei.Research on liquefaction of sandy soil in shaking table test[C].Albert T Yeung.9th International Symposium on Environmental Geotechnology and Sustainable Development,2008:435―441.
[7]李培振,任红梅,吕西林,程磊.液化地基自由场振动台模型试验研究[J].地震工程与工程振动,2008,28(2):172―178.Li Peizhen,Ren Hongmei,Lu Xilin,Cheng Lei.Shaking table test on free field considering soil liquefaction[J].Journal of Earthquake Engineering and Engineering Vibration,2008,28(2):172―178.(in Chinese)
[8]吴永娟.碎石桩加固不同密实度液化砂土的振动台试验研究[D].太原:太原理工大学,2009.Wu Yongjuan.The shaking table experimental study on liquefiable sand soil with different density improved by gravel pile[D].Taiyuan:Taiyuan University of Technology,2009.(in Chinese)
[9]张克绪,谢君斐.土动力学[M].北京:地震出版社,1989.Zhang Kexu,Xie Junfei.Dynamic soils[M].Beijing:Seismological Engineering,1989.(in Chinese)
[10]闫卫泽,牛琪瑛,杨庆陶.复合地基抗液化振动台试验中模型的制备[J].山西建筑,2007,33(4):89―90.Yan Weize,Niu Qiying,Yang Qingtao.Preparation of model in shaking table test on liquefaction resistance of composite foundation[J].Shanxi Architecture,2007,33(4):89―90.(in Chinese)
[11]杨庆陶.桩体加固液化砂土的振动台试验研究[D].太原:太原理工大学,2008.Yang Qingtao.The shaking table experimental study on liquefiable sand soil improved by pile[D].Taiyuan:Taiyuan University of Technology,2008.(in Chinese)
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