土工离心模型试验中动力破坏模拟能力分析
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摘要
针对土工离心模型试验中模型与原型在动力响应、动力破坏模拟方面的相似程度,研究了不同层次的相似比尺要求下模型结构材料的选择与设计方法;对所研制的4种不同桩径的抗滑桩缩尺模型,通过离心模型试验分析了缩尺模型在不同承载力条件下动力破坏模拟的规律及破坏特点。结果表明,小桩径抗滑桩在静力条件下因承载力不足而开裂,在动力作用下可导致桩底截面裂缝贯通;较大桩径抗滑桩在静力条件下稳定,但在动力作用下可发生开裂破坏;大桩径抗滑桩在静力和动力条件下均未发生开裂,表明其具有足够的静动抗弯能力,但在高水位时大桩径抗滑桩在动力作用下可发生断裂破坏。由于研制的缩尺模型严格满足原型的相似比尺要求,因此模型试验结果能够反映原型抗滑桩的破坏机理。
Aiming at different similar levels on the dynamic response and the simulation of dynamic failure between the model and the prototype in geotechnical dynamic centrifugal model test,the similar scale and the choice of model material for geotechnical centrifuge modeling were anylyzed,and then the issues of principle and design on the simulation of dynamic response and dynamic failure in geotechnical dynamic centrifugal model test were proposed.Finally,the dynamic response laws and the failure characteristics of model concrete pile in geotechnical dynamic centrifugal model tests were discussed by means of the developed model piles with four kinds of diameters.Results show that the stabilizing piles with the small diameter under the condition of static cracking due to insufficient bearing capacity,can be led to pile section fracture penetration under dynamic action;the stabilizing piles with the larger diameter under the condition of static stability,but can show cracking destruction under dynamic action;the stabilizing piles with the largest diameter under static and dynamic conditions are not crazed,but the fracture damage can occur under dynamic action in the high water level.As a result of the scale of the model and the prototype strictly meet the similarity scale,so these model test results can reflect the failure mechanism of the prototype stabilizing piles.
Aiming at different similar levels on the dynamic response and the simulation of dynamic failure between the model and the prototype in geotechnical dynamic centrifugal model test,the similar scale and the choice of model material for geotechnical centrifuge modeling were anylyzed,and then the issues of principle and design on the simulation of dynamic response and dynamic failure in geotechnical dynamic centrifugal model test were proposed.Finally,the dynamic response laws and the failure characteristics of model concrete pile in geotechnical dynamic centrifugal model tests were discussed by means of the developed model piles with four kinds of diameters.Results show that the stabilizing piles with the small diameter under the condition of static cracking due to insufficient bearing capacity,can be led to pile section fracture penetration under dynamic action;the stabilizing piles with the larger diameter under the condition of static stability,but can show cracking destruction under dynamic action;the stabilizing piles with the largest diameter under static and dynamic conditions are not crazed,but the fracture damage can occur under dynamic action in the high water level.As a result of the scale of the model and the prototype strictly meet the similarity scale,so these model test results can reflect the failure mechanism of the prototype stabilizing piles.
引文
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[3]朱朝峰,赵荣炼.离心模型模拟法在若干土工工程中的应用性状[J].水利发电学报,1993(1):102-107.Zhu Chaofeng,Zhao Ronglian.Journal of Hydroelectric Engineering,1993(1):102-107.
[4]Brandenberg S J,Boulanger R W,Kutter B L,et al.Observations and analysis of pile groups in liquefied and laterally spreading ground in centrifuge tests[J].ASCE,Geotechnical Special Publication,2006,145:161-172.
[5]Boulanger R W,Curras C J,Kutter B L,et al.Seismic soil-pile-structure interaction experiments and analyses[J].Journal of Geotechnical and Geoenvironmental Engineering,1999,125(9):750-759.
[6]Ghosh B,Madabhushi S P G.Centrifuge modelling of seismic soil structure interaction effects[J].Nuclear Engineering and Design,2007,237(8):887-896.
[7]Ishizaki S,Tokimatsu K,Nagao T.Seismic behavior of pile-supported building with semi-rigid pile head connections in liquefiable soil[J].Journal of Structural and Construction Engineering,2012,77(667):1089-1097.
[8]Lee C J.Centrifuge modeling of the behavior of caisson-type quay walls during earthquakes[J].Soil Dynamics and Earthquake Engineering,2005,25(2):117-131.
[9]Takahashi A,Takemura J,Kawaguchi Y,et al.Stability of piled pier subjected to lateral flow of soils during earthquake[C].Centrifuge 98,Tokyo,Japan,September 23-25,1998.
[10]Takahashi A,Takemura J.Liquefaction-induced large displacement of pile-supported wharf[J].Soil Dynamics and Earthquake Engineering,2005,25(11):811-825.
[11]李荣建,于玉贞,吕禾,等.饱和砂土地基上抗滑桩加固边坡的动力离心模型试验研究[J].岩土力学,2009,30(4):898-902.Li Rongjian,Yu Yuzhen,LüHe,et al.Rock and Soil Mechanics,2009,30(4):898-902.
[12]周兵,金峰,王进廷.拱坝-坝肩整体动力稳定性的离心模型试验[J].水利水电科技进展,2011,31(1):15-19.Zhou Bing,Jin Feng,Wang Jinting.Advances in Science and Technology of Water Resources,2011,31(1):15-19.
[13]刘光磊,宋二祥,刘华北,等.饱和砂土地层中隧道结构动力离心模型试验[J].岩土力学,2008,29(8):2071-2076.Liu Guanglei,Song Erxiang,Liu Huabei,et al.Rock and Soil Mechanics,2008,29(8):2071-2076.
[14]凌道盛,郭恒,蔡武军,等.地铁车站地震破坏离心机振动台模型试验研究[J].浙江大学学报:工学版,2012,46(12):2202-2209.Ling Daosheng,Guo Heng,Cai Wujun,et al.Journal of Zhejiang University:Engineering Science,2012,46(12):2202-2209.
[15]李荣建,于玉贞,吕禾,等.动力离心模型试验中微混凝土抗滑模型桩的设计[J].清华大学学报:自然科学版,2009,49(9):1498-1502.Li Rongjian,Yu Yuzhen,LüHe,et al.Journal of Tsinghua University:Science and Technology,2009,49(9):1498-1502.
[16]于玉贞,李荣建,李广信,等.抗滑桩静力与动力破坏离心模型试验对比分析[J].岩土工程学报,2008,30(7):1090-1093.Yu Yuzhen,Li Rongjian,Li Guangxin,et al.Chinese Journal of Geotechnical Engineering,2008,30(7):1090-1093.
[17]李荣建,于玉贞,吕禾,等.可液化地基上边坡加固桩地震动力破坏特点研究[J].水利学报,2010,41(4):446-451.Li Rongjian,Yu Yuzhen,LüHe,et al.Journal of Hydraulic Engineering,2010,41(4):446-451.
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