软弱土层自由场动力离心模型试验
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摘要
软弱土层中自由场地震响应离心模型试验中,采用层状剪切箱,研究了软弱土层中不同强度地震荷载作用下场地的响应。研究结果表明:地基土的地震响应与地震强度条件密切相关,地表地震加速度放大系数随着基岩入射地震强度的增大而减小,并且对土体的侧向位移和地表沉降等存在显著影响。
Centrifugal modeling technique was employed to study the dynamic earthquake response of free-field in soft soil.Three sets of earthquake input motions with different intensities were applied in the tests.Meanwhile,a laminar box was used to consider the flexible boundary during earthquakes.The earthquake responses of foundation soil were observed and presented.The results indicated that the performance of ground(lateral displacement and settlement) depended on the intensities of the excitation motions distinctively.A stronger earthquake leads to larger exact acceleration value.However,the acceleration amplification effect is reduced especially at the ground surface.
Centrifugal modeling technique was employed to study the dynamic earthquake response of free-field in soft soil.Three sets of earthquake input motions with different intensities were applied in the tests.Meanwhile,a laminar box was used to consider the flexible boundary during earthquakes.The earthquake responses of foundation soil were observed and presented.The results indicated that the performance of ground(lateral displacement and settlement) depended on the intensities of the excitation motions distinctively.A stronger earthquake leads to larger exact acceleration value.However,the acceleration amplification effect is reduced especially at the ground surface.
引文
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[2]KAWASAKI K,SAKAI T,YASUDA S.Earthquake-In-duced Settlement of Isolated Footing for Power Transmis-sion Tower[G].Rotterdam:A A Balkema,1994:55-62.
[3]章为民,日下部治.砂性地层地震反应离心模型试验研究[J].岩土工程学报,2001,23(1):28-31.(ZHANG Wei-min,KUSAKABE O.Dynamic CentrifugeModel Test of Sandy Layer[J].Chinese Journal ofGeotechnical Engineering,2001,23(1):28-31.(inChinese))
[4]HAUSLER E A,SITAR N.Centrifuge Modeling of theSeismic Performance of Improved Ground[C]∥HongKong University of Science and Technology and the Uni-versity of California.International Symposium onGeotechnical Centrifuge Modelling and Networking.HongKong University of Science and Technology,December 8-9,2001,Davis:the University of California:25-27.
[5]SU D,LI X S.Centrifuge Tests on Earthquake Responseof Sand Deposit Subjected to Multi-directional Shaking[C]∥Proceedings of 16th ASCE Engineering MechanicsConference.University of Washington,Seattle,July 16-18,2003:16-18.
[6]LAI T,ELGAMAL A,YANG Z,et al.Numerical Mod-eling of Dynamic Centrifuge Experiments on a SaturatedDense Sand Stratum[C]∥Proceedings of 11th Interna-tional Conference on Soil Dynamics&Earthquake Engi-neering and 3rd International Conference on EarthquakeGeotechnical Engineering,University of California,Berkeley,January 7-9,2004:558-565.
[7]陈国兴,庄海洋,程绍革,等.土-地铁隧道动力相互作用的大型振动台试验-试验方案设计[J].地震工程与工程震动,2006,26(6):178-183.(CHEN Guo-xing,ZHUANG Hai-yang,CHENG Shao-ge,et al.A Large-Scale Shaking Table Test for Dynamic Soil-Metro TunnelInteraction:Test Scheme[J].Earthquake Engineeringand Engineering Vibration,2006,26(6):178-183.(inChinese))
[8]陈继华,陈国兴,史国龙.深厚软弱场地地震反应特性研究[J].防灾减灾工程学报,2004,24(2):132-138.(CHEN Ji-hua,CHEN Guo-xing,SHI Guo-long.Re-search on Seismic Response Characteristics of Sites withDeep and Soft Soils[J].Journal of Disaster Preventionand Mitigation Engineering,2004,24(2):132-138.(inChinese))
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