砂土自由场地基水平垂直振动离心模拟试验
|
摘要
利用最新研制的R500B振动台在450 g-t离心机上对砂土自由场地基在水平和垂直地震下的动态反应做了离心模拟试验研究。模拟离心重力场为30 g,振动台在水平和垂直方向的控制最大加速度分别为20 g和10 g。模型内布置相应的微型加速度计以测量地震反应。结果表明,在水平和竖向同时激振与单向分别激振砂土两种情况下,砂土地基有不同的动力反应,应在设计中予以考虑水平和竖向同时激振的耦合作用对砂土地基的影响。
Seismic responses of free-field sand ground under horizontal and vertical earthquakes are investigated using a hydraulic earthquake simulator R500B installed on a 450 g-ton geotechnical centrifuge.The test is conducted under a centrifugal gravity field of 30 g with a minimum horizontal seismic acceleration of 20 g and vertical seismic acceleration of 10 g.Several accelerometers are used to measure the seismic responses of the free-field sand ground.The test result shows the seismic difference between the combined responses and the independent responses.The coupled seismic effects on the sand ground should be considered in design.
Seismic responses of free-field sand ground under horizontal and vertical earthquakes are investigated using a hydraulic earthquake simulator R500B installed on a 450 g-ton geotechnical centrifuge.The test is conducted under a centrifugal gravity field of 30 g with a minimum horizontal seismic acceleration of 20 g and vertical seismic acceleration of 10 g.Several accelerometers are used to measure the seismic responses of the free-field sand ground.The test result shows the seismic difference between the combined responses and the independent responses.The coupled seismic effects on the sand ground should be considered in design.
引文
[1]刘晶波,刘祥庆,王宗纲.砂土地基自由场离心机振动台模型试验[J].清华大学学报,2009,49(9):1463-1466.LIU Jing-bo,LIU Xiang-qing,WANG Zong-gang.Dynamic centrifuge model test of an unconfined sandyfoundation[J].Journal of Tsinghua University,2009,49(9):1463-1466.
[2]RAYHANI M H T,EL NAGGAR M H.Seismic responseof sands in centrifuge tests[J].Canadian GeotechnicalJournal,2008,45(4):470-483.
[3]于玉贞,邓丽军,李荣建.砂土边坡地震动力响应离心模型试验[J].清华大学学报,2007,47(6):789-792.YU Yu-zhen,DENG Li-jun,LI Rong-jian.Centrifugalmodel test of the seismic behaviour of a sand slope[J].Journal of Tsinghua University,2007,47(6):789-792.
[4]王年香,章为民,顾行文,等.长河坝动力离心模型试验研究[J].水力发电学报,2009,35(5):67-70.WANG Nian-xiang,ZHANG Wei-min,GU Xing-wen,et al.Dynamic centrigfuge mode test for Changhe dam[J].Journal of Hydroelectric Engineering,2009,35(5):67-70.
[5]KUTTER B L,JAMES R G.Dynamic centrifuge modeltests on clay embankments[J].Géotechnique,1989,39(1):91-106.
[6]VAN LAAK P A,TABOADA V M,DOBRY R,et al.Earthquake centrifuge modeling using a laminarbox[C]//Proceedings of the Symposium on DynamicGeotechnical Testing II,San Francisco:ASTM,1994.
[7]苏栋,李湘菘.砂土自由场地震响应的离心机试验研究[J].地震工程与工程振动,2006,26(2):166-170.SU Dong,LI Xiang-song.Centrifuge modeling of seismicresponse of free sand ground[J].EarthquakeEngineering and Engineering Vibration,2006,26(2):166-170.
[8]许强,陈建君,冯文凯,等.斜坡地震响应的物理模拟试验研究[J].四川大学学报,2009,41(3):266-272.XU Qiang,CHEN Jian-jun,FENG Wen-kai,et al.Studyof the seismic response of slopes by physical modeling[J].Journal of Sichuan University,2009,41(3):266-272.
[9]李湛,栾茂田,刘占阁,等.竖向地震加速度对堤坝抗震性能影响分析[J].大连理工大学学报,2006,46(4):538-543.LI Zhan,LUAN Mao-tian,LIU Zhan-ge,et al.Analysesof effects of vertical acceleration on a seismic stabilityand seismically-induced sliding movement of embank-ments[J].Journal of Dalian Universtiy of Technology,2006,46(4):538-543.
[10]侯瑜京.土工离心机振动台及其试验技术[J].中国水利水电科学研究院学报,2006,4(1):15-21.HOU Yu-jing.Centrifuge shakers and testinggeotechnique[J].Journal of China Institute of WaterResources and Hydropower Research,2006,4(1):15-21.
[11]刘晶波,刘祥庆,王宗纲.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.Boundary effect of laminar model box for shaking tabletests on geotechnical centrifuge system[J].Journal ofBejing University of Technology,2008,34(9):931-937.
[2]RAYHANI M H T,EL NAGGAR M H.Seismic responseof sands in centrifuge tests[J].Canadian GeotechnicalJournal,2008,45(4):470-483.
[3]于玉贞,邓丽军,李荣建.砂土边坡地震动力响应离心模型试验[J].清华大学学报,2007,47(6):789-792.YU Yu-zhen,DENG Li-jun,LI Rong-jian.Centrifugalmodel test of the seismic behaviour of a sand slope[J].Journal of Tsinghua University,2007,47(6):789-792.
[4]王年香,章为民,顾行文,等.长河坝动力离心模型试验研究[J].水力发电学报,2009,35(5):67-70.WANG Nian-xiang,ZHANG Wei-min,GU Xing-wen,et al.Dynamic centrigfuge mode test for Changhe dam[J].Journal of Hydroelectric Engineering,2009,35(5):67-70.
[5]KUTTER B L,JAMES R G.Dynamic centrifuge modeltests on clay embankments[J].Géotechnique,1989,39(1):91-106.
[6]VAN LAAK P A,TABOADA V M,DOBRY R,et al.Earthquake centrifuge modeling using a laminarbox[C]//Proceedings of the Symposium on DynamicGeotechnical Testing II,San Francisco:ASTM,1994.
[7]苏栋,李湘菘.砂土自由场地震响应的离心机试验研究[J].地震工程与工程振动,2006,26(2):166-170.SU Dong,LI Xiang-song.Centrifuge modeling of seismicresponse of free sand ground[J].EarthquakeEngineering and Engineering Vibration,2006,26(2):166-170.
[8]许强,陈建君,冯文凯,等.斜坡地震响应的物理模拟试验研究[J].四川大学学报,2009,41(3):266-272.XU Qiang,CHEN Jian-jun,FENG Wen-kai,et al.Studyof the seismic response of slopes by physical modeling[J].Journal of Sichuan University,2009,41(3):266-272.
[9]李湛,栾茂田,刘占阁,等.竖向地震加速度对堤坝抗震性能影响分析[J].大连理工大学学报,2006,46(4):538-543.LI Zhan,LUAN Mao-tian,LIU Zhan-ge,et al.Analysesof effects of vertical acceleration on a seismic stabilityand seismically-induced sliding movement of embank-ments[J].Journal of Dalian Universtiy of Technology,2006,46(4):538-543.
[10]侯瑜京.土工离心机振动台及其试验技术[J].中国水利水电科学研究院学报,2006,4(1):15-21.HOU Yu-jing.Centrifuge shakers and testinggeotechnique[J].Journal of China Institute of WaterResources and Hydropower Research,2006,4(1):15-21.
[11]刘晶波,刘祥庆,王宗纲.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.Boundary effect of laminar model box for shaking tabletests on geotechnical centrifuge system[J].Journal ofBejing University of Technology,2008,34(9):931-937.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心