循环荷载作用下碎石桩加固液化地基试验研究
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摘要
应用简易振动台和叠层剪切变形模型箱,进行了循环荷载作用下碎石桩加固液化地基试验研究,试验分析了碎石桩的加固效应,并着重分析了碎石桩的排水效应.复合地基模型采用三角形及矩形两种方案加固细砂土液化地基,试验结果表明:无论是矩形加固方案还是三角形加固方案,碎石桩均有效地防止了地基液化,并且激振结束后,碎石桩加速了孔隙水压力的消散.
Based on the development of simple shaking table and laminar shear box,stone columns composite foundation shaking table tests are performed under cyclic loading.And,especially,the drainage effect of stone columns is analyzed.The test results show that both the rectangular reinforcement project and the triangular one can effectively prevent sand liquefaction,and the stone columns can accelerate the dissipation of pore water pressure at the end of excitation.
Based on the development of simple shaking table and laminar shear box,stone columns composite foundation shaking table tests are performed under cyclic loading.And,especially,the drainage effect of stone columns is analyzed.The test results show that both the rectangular reinforcement project and the triangular one can effectively prevent sand liquefaction,and the stone columns can accelerate the dissipation of pore water pressure at the end of excitation.
引文
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[9]何广讷.振冲碎石桩复合地基[M].北京:人民交通出版,2001:8.HE Guangne,Composite Foundation of Vibro-Replace-ment Stone Column[M].Beijing:China CommunicationsPress,2001:8.(in Chinese)
[2]Mizuno H,Iiba M.Shaking Table Testing of SeismicBuilding-Pile-Soil Interaction[C]∥San Francisco:Proc8th WCCE,1984.
[3]王士风.建筑物可液化地基用砾石排水桩加固的试验研究[D].北京:冶金部建筑研究总院,1984.WANG Shifeng.The Experiment Study of the BuildingLiquefiable Sand Foundation Reinforced by Gravel DrainagePile[D].Beijing:The Metallurgical Ministry of CentralResearch Institute of Building and Construction,1984.(inChinese)
[4]Meymand P.Shaking Table Scale Model Test of NonlinearSoil-Pile-Superstructure Interaction in Soft Clay[D].Berkley:Univ.of California Berkley,1998.
[5]吕西林,陈跃庆,陈波,等.结构-地基动力相互作用体系振动台模型试验研究[J].地震工程与工程振动,2000,20(4):20-29.LU Xilin,CHEN Yueqing,CHEN Bo,et al,ShakingTable Testing of Dynamic Soil-Structure Interaction Sys-tem[J],Earthquake Engineering and Engineering Vibra-tion,2000,20(4):20-29.(in Chinese)
[6]伍小平,孙利民,胡世德,等.振动台用层状剪切变形土箱的研制[J].同济大学学报,2002,30(7):649-656.WU Xiaoping,SUN Limin,HU Shide,et al.Develop-ment of Laminar Shear Box Used in Shaking Table Test[J].Journal of Tongji University,2002,30(7):649-656.(in Chinese)
[7]靳建军.循环荷载作用下碎石桩加固液化地基效果试验研究[D].北京:北京交通大学,2005.JIN Jianjun.Experimental Study on the Liquefiable Foun-dation Improved by Stone Columns Under Cyclic Loading[D].Beijing:Beijing Jiaotong University,2005.(in Chi-nese)
[8]靳建军,张鸿儒.饱和砂土液化特性动三轴试验研究[J].北京交通大学学报,2006,30(4):60-63.JIN Jianjun,ZHANG Hongru.Experimental Study ofSand Liquefaction Characteristics By Dynamic Tri-AxialTest[J].Journal of Beijing Jiaotong University,2006,30(4):60-63.(in Chinese)
[9]何广讷.振冲碎石桩复合地基[M].北京:人民交通出版,2001:8.HE Guangne,Composite Foundation of Vibro-Replace-ment Stone Column[M].Beijing:China CommunicationsPress,2001:8.(in Chinese)
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