重型设备-桩箱基础-砂卵石地基体系动力稳定性振动台试验
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摘要
设计并完成了重型设备-桩箱基础-砂卵石地基体系地震反应的大型振动台模型试验,分析了设备结构位移和转角反应特征以及桩箱基础和砂卵石地基的动力稳定性。试验结果表明:设备结构位移反应峰值呈上大、下小的三角形分布,位移和转角反应受结构振动方向第一振型控制;振动过程中基底两侧土反力增量不均,由上部重型结构水平惯性力引起的基础转动效应明显,这也是基础发生倾斜的主要原因;箱形基础振动对周围地基土产生挤密作用,基础转动显著影响侧墙土压力分布形态;强震作用下,砂卵石地基持力层振动孔压比能达到0.3~0.5,振动孔压的累积和消散可引起基础附加沉降。试验结果可为砂卵石地基箱形基础抗震设计提供参考和借鉴。
A heavy-duty equipment-pile box foundation-sand gravel ground model system was designed and then tested on a shaking table.The dynamic displacement feature of the main equipment structure and the dynamic stability of the tested system were analyzed in detail.The test results indicated the structure dynamic displacement with a big-end-up triangle distribution was controlled by the first mode of the structure.In addition,the reaction increments on the two sides of the box foundation base were unbalanced during the vibration.The rotation effects of the box foundation,induced by the horizontal inertia force effects of the superstructure,were remarkable.This was also the major factor resulting in the declivity of a box foundation.The vibration of the box foundation made the surrounding soils compacted.The rotation of the foundation could obviously influence the distribution modality of the soil pressure on the side wall.Additionally,the excess pore water pressure ratio of the tested sand gravel soils could be reached to 0.3-0.5.The build-up and dissipation of the excess pore water pressure might beget the extra settlement of the box foundation.These conclusions supplied some references for the seismic design of the box foundation in sand-gravel ground.
A heavy-duty equipment-pile box foundation-sand gravel ground model system was designed and then tested on a shaking table.The dynamic displacement feature of the main equipment structure and the dynamic stability of the tested system were analyzed in detail.The test results indicated the structure dynamic displacement with a big-end-up triangle distribution was controlled by the first mode of the structure.In addition,the reaction increments on the two sides of the box foundation base were unbalanced during the vibration.The rotation effects of the box foundation,induced by the horizontal inertia force effects of the superstructure,were remarkable.This was also the major factor resulting in the declivity of a box foundation.The vibration of the box foundation made the surrounding soils compacted.The rotation of the foundation could obviously influence the distribution modality of the soil pressure on the side wall.Additionally,the excess pore water pressure ratio of the tested sand gravel soils could be reached to 0.3-0.5.The build-up and dissipation of the excess pore water pressure might beget the extra settlement of the box foundation.These conclusions supplied some references for the seismic design of the box foundation in sand-gravel ground.
引文
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[3]彭轶君,尚守平,朱志辉,等.有限元模拟土-箱基-框架结构大比例模型动力相互作用研究[J].铁道科学与工程学报,2006,3(1):75―79.Peng,Yijun,Shang Shouping,Zhu Zhihui,et al.FEMstudy on dynamic interaction of soil-box foundationframe structure[J].Journal of Railway Science andEngineering,2006,3(1):75―79.(in Chinese)
[4]文学章,尚守平.水平向不均匀土对箱基动力阻抗的影响[J].地震工程与工程振动,2009,29(6):191―196.Wen Xuezhang,Shang Shouping.Effects of horizontallyin homogeneous soil on dynamic impedance functions ofbox foundation[J].Earthquake Engineering and Engineering Vibration,2009,29(6):191―196.(inChinese)
[5]Tokimatsu K,Suzuki H,Sato M.Effects of inertial andkinematic on seismic behavior of pile with embeddedfoundation[J].Soil Dynamics and EarthquakeEngineering,2005,25(7/10):753―762.
[6]Hu X Q,Cai Y Q,Wang J,et al.Rocking vibrations of arigid embedded foundation in a poroelastic soil layer[J].Soil Dynamics and Earthquake Engineering,2010,30(4):280―284.
[7]Prasad S K,Towhata I,Chandradhara G P,et al.Shakingtable tests in earthquake geotechnical engineering[J].Current Science,Special section:Geotechnics andEarthquake Hazard,2004(10):1398―1404.
[8]Meymand P.Shaking table scale model test of nonlinearsoil-pile-superstructure interaction in soft clay[D].Berkeley:University of California Berkeley,1998.
[9]汪强,王进廷,金峰,张楚汉.结构-地基动力相互作用的实时耦联动力试验[J].工程力学,2011,28(2):94―100,185.Wang Qiang,Wang Jinting,Jin Feng,Zhang Chuhan.Soil-structure interaction analysis by real-time dynamichybrid testing[J].Engineering Mechanics,2011,28(2):94―100,185.(in Chinese)
[10]唐亮,凌贤长,徐鹏举,高霞.可液化场地高承台群桩-土桥梁结构地震相互作用振动台试验[J].中国公路学报,2010,23(4):51―57.Tang Liang,Ling Xianzhang,Xu Pengju,Gao Xia.Shaking table test for seismic interaction of pilegroups-soil-bridge structure with elevated cap inliquefiable ground[J].China Journal of Highway andTransport,2010,23(4):51―57.(in Chinese)
[11]张敏政.地震模拟试验中相似律应用的若干问题[J].地震工程与工程振动,1997,17(2):52―58.Zhang Minzheng.Study on similitude laws for shakingtable test[J].Earthquake Engineering and EngineeringVibration,1997,17(2):52―58.(in Chinese)
[12]陈国兴,王志华,左熹,等.振动台试验叠层剪切型土箱的研制[J].岩土工程学报,2010,32(1):89―97.Chen Guoxing,Wang Zhihua,Zuo Xi,et al.Development of laminar shear soil container for shakingtable tests[J].Journal of Chinese GeotechnicalEngineering,2010,32(1):89―97.(in Chinese)
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