液化地基自由场振动台试验的土性参数识别
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摘要
基于已进行的液化地基自由场振动台试验,利用参数识别技术对试验记录的土体加速度和孔隙水压力进行分析,研究了场地液化机理及土的动力特性.由自由场振动台试验的土体加速度记录求出土体的动剪切应力—应变曲线,并研究了土体的动剪切模量及阻尼特性随动剪切应变的变化关系.结果表明:利用参数识别技术识别的土的刚度与土动力性质试验获得的数据基本一致,而阻尼要高于土动力性质试验的结果;孔隙水压力增长对土的剪切波速有影响,会引起土的刚度降低.
The characteristics of liquefiable soil during earthquake excitation of free field were identified based on multiple acceleration records in shaking table tests.The time histories of cyclic shear stress and shear strain in the soils were evaluated from the accelerations recorded in the soil.These histories were used to estimate variation of soil dynamic shear moduli and material damping characteristics with shear strain amplitude.Soil stiffness properties agree well with those obtained based on laboratory tests.The material damping computed from acceleration records was however much higher than that independently measured in laboratory tests.Pore pressure buildup was found to affect shear wave velocity in the soil and weaken soil stiffness.
The characteristics of liquefiable soil during earthquake excitation of free field were identified based on multiple acceleration records in shaking table tests.The time histories of cyclic shear stress and shear strain in the soils were evaluated from the accelerations recorded in the soil.These histories were used to estimate variation of soil dynamic shear moduli and material damping characteristics with shear strain amplitude.Soil stiffness properties agree well with those obtained based on laboratory tests.The material damping computed from acceleration records was however much higher than that independently measured in laboratory tests.Pore pressure buildup was found to affect shear wave velocity in the soil and weaken soil stiffness.
引文
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[2]Zeghal M,Elgamal A W.Analysis of site liquefaction usingearthquake records[J].Journal of Geotechnical EngineeringDivision:ASCE,1994,120(6):996.
[3]Tamura S,Suzuki Y,Tsuchiya T,et al.Dynamic response andfailure mechanisms of a pile foundation during soil liquefactionby shaking table test with a large-scale laminar shear box[C]∥12th World Conference on Earthquake Engineering.Auckland:[s.n.],2000.
[4]Kagawa T,Minowa C,Abe A.EDUS project(earthquakedamage to underground structures)[C]∥12th WorldConference on Earthquake Engineering.Auckland:[s.n.],2000.
[5]Suzuki H,Toki matsu K,Sato M,et al.Soil-pile-structureinteraction in liquefiable ground through multi-di mensionalshaking table tests using E-defense facility[C]∥14th WorldConference on Earthquake Engineering.Beijing:[s.n.],2008.
[6]陈跃庆,吕西林,侯建国,等.有建筑物存在的软土地基液化模拟地震振动台试验研究[J].武汉大学学报:工学版,2003,36(1):59.CHEN Yueqing,LU Xilin,HOUJianguo,et al.Shaking tabletesting on seismic liquefaction of soft soil under buildingfooting[J].Engineering Journal of Wuhan University,2003,36(1):59.
[7]凌贤长,郭明珠,王东升,等.液化场地桩基桥梁震害响应大型振动台模型试验研究[J].岩土力学,2006,27(1):7.LI NG Xianzhang,GUO Mingzhu,WANG Dongsheng,et al.Large-scale shaking table model test of seism response ofbridge of pile foundation in ground of liquefaction[J].Rockand Soil Mechanics,2006,27(1):7.
[8]孟上九,刘汉龙,袁晓铭,等.可液化地基上建筑物不均匀震陷机制的振动台试验研究[J].岩石力学与工程学报,2005,24(11):1978.MENG Shangjiu,LI U Hanlong,YUAN Xiaoming,et al.Experi mental study onthe mechanismof earthquake-induceddifferential settlement of building on liquescent subsoil[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(11):1978.
[9]冯士伦,王建华,郭金童.液化土层中桩基抗震性能振动台试验研究[J].土木工程学报,2005,38(7):92.FENG Shilun,WANG Jianhua,GUO Jintong.A shake tabletest onthe seismic resistance of pile foundationinliquefied soil[J].China Civil Engineering Journal,2005,38(7):92.
[10]李培振,任红梅,吕西林,等.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):171.LI Peizhen,REN Hongmei,LU Xilin,et al.Shaking table teston free field considering soil liquefaction[J].EarthquakeEngineering and Engineering Vibration,2008,28(2):171.
[11]Koga Y,Matsuo O.Shaking table tests of embankments resting onliquefiable sandy ground[J].Soils Found,1990,30:162.
[12]Elgamal A W,Zeghal M,Tang H T,et al.Evaluation of low-strain site characteristics using the Lotung seismic array[J].Journal of Geotechnical Engineering Division:ASCE,1995,121(4):350.
[13]Elgamal A W,Yang Z H,Lai T,et al.Dynamic response ofsaturated dense sand in laminated centrifuge container[J].Journal of Geotechnical and Geoenvironmental Engineering:ASCE,2005,131(5):598.
[14]Zeghal M,Elgamal A W,Parra E.Identification and modelingof earthquake ground response-Ⅱ.Site liquefaction[J].SoilDynamics and Earthquake Engineering,1996,15:523.
[15]Bardet J P,Tobita T.NERA-A computer program for nonlinearearthquake site response analyses of layered soil deposits[R].LosAngeles:University of Southern California,2001.
[16]Iwan W D.On a class of models for the yielding behavior ofcontinuous and composite systems[J].Journal of AppliedMechanics:ASME,1967,34:612.
[17]Mróz Z.On the description of anisotropic work hardening[J].Journal of Mechanics and Physics of Solids,1967,15:163.
[18]Zeghal M,Kallou P V,Oskay C,et al.Identification andi maging of soil and soil-pile deformation in the presence ofliquefaction[J].Earthquake Engineering and EngineeringVibration,2006,5(2):171.
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