液化场地的桩-土-上部结构振动台模型试验的研究
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摘要
文章以液化场地桩-土-结构动力相互作用体系的振动台试验研究为基础,结合非液化场地桩-土-结构动力相互作用体系的振动台试验,再现了液化场地中上部结构与桩基的震害现象;基于振动台试验,对试验现象;孔隙水压力、土体及上部结构的动力反应、桩的应变等进行了研究和分析。结果表明:液化地基使承台在震后有明显的不均匀沉降,上部结构位移幅值显著增大,孔隙水压力随着地震波的增大而上升,结构的破坏与地震的波形有关,土体液化是桩基破坏的主要原因之一,液化土层也具有一定的减振隔震作用。
This paper disclosed the earthquake disaster phenomena of the pile foundation and the superstructure system,which was based on the shaking table test of the pile-soil-superstructure system in the liquefied ground and compared with that in the non-liquefied ground.The variations of the pore water pressure,the dynamic response and displacements of the soil and superstructure and the strain of the pile shaft were analyzed by the shaking table test.The results show that the differential settlement of the pile cap is obvious in the liquefied ground after the earthquake;the displacement of the superstructure increases prominently;the pore water pressure increases with the rising of the seismic wave;there is a corresponding relationship between the structural failure and the seismic wave form;liquefaction is a major cause of the pile damage;the liquefied soil layer takes a part in keeping the superstructure in isolation from vibrating.
This paper disclosed the earthquake disaster phenomena of the pile foundation and the superstructure system,which was based on the shaking table test of the pile-soil-superstructure system in the liquefied ground and compared with that in the non-liquefied ground.The variations of the pore water pressure,the dynamic response and displacements of the soil and superstructure and the strain of the pile shaft were analyzed by the shaking table test.The results show that the differential settlement of the pile cap is obvious in the liquefied ground after the earthquake;the displacement of the superstructure increases prominently;the pore water pressure increases with the rising of the seismic wave;there is a corresponding relationship between the structural failure and the seismic wave form;liquefaction is a major cause of the pile damage;the liquefied soil layer takes a part in keeping the superstructure in isolation from vibrating.
引文
[1]张会荣,刘松玉.地震液化引起的地面大变形对桥梁桩基的影响研究综述[J].防灾减灾工程学报,2004,24(3):350-354.
[2]冯士伦,王建华,郭金童.液化土层中桩基抗震性能振动台试验研究[J].土木工程学报,2005,38(7):92-95.
[3]孙锐,袁晓铭.液化土层地震动特征分析[J].岩土工程学报,2004,26(5):684-690.
[4]钱德玲,夏京,卢文胜,等.支盘桩-土-高层建筑结构振动台试验的研究[J].岩石力学与工程学报,2009,28(10):2024-2030.
[5]杨树标,李荣华,刘建平,等.振动台试验模型和原型相似关系的理论研究[J].河北工程大学学报:自然科学版,2007,24(1):8-11.
[6]王东坡.支盘桩-地基-结构相互作用体系的振动台试验研究[D].合肥:合肥工业大学,2005.
[7]陈跃庆,吕西林,侯建国,等.有建筑物存在的软土地基液化模拟地震振动台试验研究[J].武汉大学学报:工学版,2003,36(1):59-63,85.
[8]凌贤长,郭明珠,王东升,等.液化场地桩基桥梁震害响应大型振动台模型试验研究[J].岩土力学,2006,27(1):7-11.
[9]石兆吉,郁寿松.地震对房屋震害影响的宏观分析[J].工程抗震,1993(1):25-27.
[10]李培振,任红梅,吕西林,等.液化地基自由场振动台模型试验研究[J].地震工程与工程振动,2008,28(2):171-178.
[2]冯士伦,王建华,郭金童.液化土层中桩基抗震性能振动台试验研究[J].土木工程学报,2005,38(7):92-95.
[3]孙锐,袁晓铭.液化土层地震动特征分析[J].岩土工程学报,2004,26(5):684-690.
[4]钱德玲,夏京,卢文胜,等.支盘桩-土-高层建筑结构振动台试验的研究[J].岩石力学与工程学报,2009,28(10):2024-2030.
[5]杨树标,李荣华,刘建平,等.振动台试验模型和原型相似关系的理论研究[J].河北工程大学学报:自然科学版,2007,24(1):8-11.
[6]王东坡.支盘桩-地基-结构相互作用体系的振动台试验研究[D].合肥:合肥工业大学,2005.
[7]陈跃庆,吕西林,侯建国,等.有建筑物存在的软土地基液化模拟地震振动台试验研究[J].武汉大学学报:工学版,2003,36(1):59-63,85.
[8]凌贤长,郭明珠,王东升,等.液化场地桩基桥梁震害响应大型振动台模型试验研究[J].岩土力学,2006,27(1):7-11.
[9]石兆吉,郁寿松.地震对房屋震害影响的宏观分析[J].工程抗震,1993(1):25-27.
[10]李培振,任红梅,吕西林,等.液化地基自由场振动台模型试验研究[J].地震工程与工程振动,2008,28(2):171-178.
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