地基自由场离心机振动台模型试验研究
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摘要
在清华大学土工离心机实验室50g离心场环境中进行了一系列地基自由场离心机振动台试验。试验包括1个砂土地基、1个黏土地基和2个成层土地基振动台试验。试验中模型箱采用叠环式模型箱,其平面尺寸为0.5 m和0.2 m,试验中输入地震波采用Kobe波和Parkfield波。给出了部分试验结果分析,包括加速度时程及频谱反应、加速度峰值放大系数和土层中剪应力-剪应变变化曲线。试验结果发现,不同类型地基中加速度反应存在差异,在低频部分加速度峰值放大系数从底部到顶部逐渐增大。土体中剪应力-剪应变变化规律在砂土地基和黏土地基中存在差异。
A series of centrifuge shaking table tests on soil deposits are conducted under gravitational fields of 50g at the Institute of Geotechnical Engineering in Tsinghua University.The tests include 1 sand deposit model,1 clay deposit model and 2 layered deposit models.They are performed using a laminar shear box with plan dimensions of 0.5 m and 0.2 m respectively,and the test system is subjected to strong ground motions,Kobe waves and Parkfield waves.Partial test results are presented,including acceleration responses,Fourier spectra of accelerations,amplification factors of peak accelerations and shear stress-strain histories.The test results indicate that the acceleration responses vary in different types of soil deposits.The amplification factors increase with the decreasing depth in low frequency.And the shear stress-strain histories show discrepancy in sand and clay deposits.
A series of centrifuge shaking table tests on soil deposits are conducted under gravitational fields of 50g at the Institute of Geotechnical Engineering in Tsinghua University.The tests include 1 sand deposit model,1 clay deposit model and 2 layered deposit models.They are performed using a laminar shear box with plan dimensions of 0.5 m and 0.2 m respectively,and the test system is subjected to strong ground motions,Kobe waves and Parkfield waves.Partial test results are presented,including acceleration responses,Fourier spectra of accelerations,amplification factors of peak accelerations and shear stress-strain histories.The test results indicate that the acceleration responses vary in different types of soil deposits.The amplification factors increase with the decreasing depth in low frequency.And the shear stress-strain histories show discrepancy in sand and clay deposits.
引文
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[15]KOGA Y,MATSUO O.Shaking table tests of embankmentsresting on liquefiable sandy ground[J].Soils and Foundations,1990,30(4):162-174.
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[17]ELGAMAL Ahmed-W,ZEGHAL M,PARRA E.Liquefaction of reclaimed island in Kobe,Japan[J].Journal ofGeotechnical Engineering,1996,122(1):39-49.
[2]SCHOFIELD A N.Dynamic and earthquake geotechnicalcentrifuge modeling[C]//Proc of International Conference onRecent Advances in Geotechnical Earthquake Engineeringand Soil Dynamics,1981:1081-1100.
[3]刘晶波,刘祥庆,王宗刚,等.土-结构动力相互作用系统离心机振动台模型试验[J].土木工程学报,2010,43(11):114-121.(LIU Jing-bo,LIU Xiang-qing,WANG Zong-gang,et al.Dynamic centrifuge model test of a soil-structureinteraction system[J].China Civil Engineering Journal,2010,43(11):114-121.(in Chinese))
[4]刘晶波,刘祥庆,王宗刚,等.砂土地基自由场离心机振动台模型试验[J].清华大学学报(自然科学版),2009,49(9):1463-1466.(LIU Jing-bo,LIU Xiang-qing,WANGZong-gang,et al.Dynamic centrifuge model test of anunconfined sandy foundation[J].Journal of TsinghuaUniversity(Natural Science),2009,49(9):1463-1466.(inChinese))
[5]张建民,于玉贞,濮家骝,等.电液伺服控制离心机振动台系统研制[J].岩土工程学报,2004,26(6):843-845.(ZHANG Jian-min,YU Yu-zhen,PU Jia-liu,et al.Development of a shaking table in electro-hydraulicservo-control centrifuge[J].Chinese Journal of GeotechnicalEngineering,2004,26(6):843-845.(in Chinese))
[6]刘晶波,刘祥庆,王宗刚.离心机振动台试验叠环式模型箱边界效应[J].北京工业大学学报,2008,34(9):931-937.(LIU Jing-bo,LIU Xiang-qing,WANG Zong-gang.Boundaryeffect of laminar model box for shaking table tests ongeotechnical centrifuge system[J].Journal of BeijingUniversity of Technology,2008,34(9):931-937.(inChinese))
[7]KUTTER B L,JAMES R G.Dynamic centrifuge model testson clay embankments[J].Géotechnique,1989,39(1):91-106.
[8]CHAN C M.Bender element test in soil specimens:identifyingthe shear wave arrival time[J].Research Centre for Soft Soils(RECESS),2010,15:1263-1276.
[9]KUMAR J,MADHUSUDHAN B N.A note on themeasurement of travel times using bender and extenderelements[J].Soil Dynamics and Earthquake Engineering,2010,30:630-634.
[10]VIGGIANI G,ATKINSON J H.Interpretation of benderelement tests[J].Géotechnique,1995,45(1):149-154.
[11]刘光磊,宋二祥,刘华北,等.饱和砂土地层中地铁隧道结构动力离心模型试验[J].岩土力学,2008,29(8):2070-2076.(LIU Guang-lei,SONG Er-xiang,LIU Hua-bei,et al.Dynamic centrifuge tests on seismic response of tunnel insaturated sandy foundation[J].Rock and soil mechanics,2008,29(8):2070-2076.
[12]KAGAWA T,SATO M,MINOWA C,et al.Centrifugesimulation of large-scale shaking table tests:case studies[J].Journal of Geotechnical and Geoenvironmental Engineering,2004,130(7):663-672.
[13]CHEN Jun,SHI Xiao-jun,LI Jie.Shaking table test of utilitytunnel under non-uniform earthquake wave excitation[J].SoilDynamics and Earthquake Engineering,2010,30:1400-1416.
[14]HUO H,BOBET A,FERNANDEZ G,et al.Load transfermechanism between underground structures and surroundingground:evaluation of the failure of the Dakai Station[J].Journal of Geotechnical and Geoenvironmental Engineering,2005,131(12):1522-1533.
[15]KOGA Y,MATSUO O.Shaking table tests of embankmentsresting on liquefiable sandy ground[J].Soils and Foundations,1990,30(4):162-174.
[16]ZEGHAL M,ELGAMAL A W,TANG H T,et al.Lotungdownhole array.II:Evaluation of soil nonlinear properties[J].Journal of Geotechnical Engineering,1995,121(4):363-378.
[17]ELGAMAL Ahmed-W,ZEGHAL M,PARRA E.Liquefaction of reclaimed island in Kobe,Japan[J].Journal ofGeotechnical Engineering,1996,122(1):39-49.
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