软土层厚度对地铁车站结构地震反应的影响规律研究
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摘要
为了明确软土层厚度对地铁车站结构地震反应的影响规律,本文中对常见的两层三跨岛式地铁车站结构侧向和底部地基中存在不同厚度软土层时9种软场地条件下地铁车站结构的地震反应进行了数值模拟分析。由本文和作者之前对软土层埋深影响地铁车站结构地震反应的共同研究结果来看:软土层位于地铁车站结构侧向地基时对地铁车站结构的抗震是非常不利的,尤其是软土层位于地铁车站结构侧向地基底部时最为不利,而当软土层位于地铁车站结构底部地基中时对其抗震性能一般是有利的,起到消能减震的作用;当软土层位于地铁车站结构侧向地基顶部时,随着软土层厚度的变大,对地铁车站结构抗震性能的影响越是不利且影响程度越大,而当软土层位于地铁车站结构侧向地基底部和底部地基中时,软土层厚度的变化对地铁车站结构抗震性能的影响规律并不具有很好的一致性。
To confirm how the thickness of the soft soil layer affects the earthquake response of subway station,the finite-element method is used to model the dynamic interaction system of soil-subway station,in which nine soft sites with different thicknesses of soft soil layers are used as the foundation of subway station respectively.By the research results in this paper and others given by the authors before,it is disadvantageous to the earthquake resistance of subway station when the soft soil layers are located on lateral foundation of it,and it is especially disadvantageous when the soft soil layers are located at the bottom of lateral foundation.However,it is advantageous to the earthquake resistance of subway station when the soft soil layers are located under the foundation of it.When the soft soil layers are lying at the up of lateral foundation,it is more and more disadvantageous to the earthquake resistance of subway station with the thickness of soft soil layers becoming more larger.However,when the soft soil layers are lying at the bottom of lateral foundation or under the foundation of subway station,the thickness of soft soil layers has not accordant effect on the earthquake resistance of subway station.
To confirm how the thickness of the soft soil layer affects the earthquake response of subway station,the finite-element method is used to model the dynamic interaction system of soil-subway station,in which nine soft sites with different thicknesses of soft soil layers are used as the foundation of subway station respectively.By the research results in this paper and others given by the authors before,it is disadvantageous to the earthquake resistance of subway station when the soft soil layers are located on lateral foundation of it,and it is especially disadvantageous when the soft soil layers are located at the bottom of lateral foundation.However,it is advantageous to the earthquake resistance of subway station when the soft soil layers are located under the foundation of it.When the soft soil layers are lying at the up of lateral foundation,it is more and more disadvantageous to the earthquake resistance of subway station with the thickness of soft soil layers becoming more larger.However,when the soft soil layers are lying at the bottom of lateral foundation or under the foundation of subway station,the thickness of soft soil layers has not accordant effect on the earthquake resistance of subway station.
引文
[1]庄海洋,王修信,陈国兴.软土侧向大变形对地铁车站结构地震反应的影响规律研究[J].岩土工程学报(已投稿).
[2]庄海洋,陈国兴,朱定华.土体动力黏塑性记忆型嵌套面本构模型及其验证[J].岩土工程学报,2006,28(10):1267-1272.
[3]Jeeho Lee,Gregory L,Fenves.Plastic-damage model for cyclic loading of concrete structures[J].Journal of Engineering Mechanics,1998,124(4):892-900.
[4]Lubliner J,Oliver J,Oller S,et al.A plastic-damage model for concrete[J].International Journal of Solids and Structures,1989,25(3):299-326.
[5]程建军,严三保,蒋建平,等.南京地铁南北线主要工程地震问题认识与评价[J].地球科学与环境学报,2004,26(1):46-51.
[6]楼梦麟,王文剑,朱彤等.土结构体系振动台模型试验中土层边界影响问题[J].地震工程与工程振动,2000,20(4):30-16.
[7]陈跃庆,吕西林,黄炜.结构地基相互作用振动台试验中土体边界条件的模拟方法[J].结构工程师,2000,16(3):20-30.
[2]庄海洋,陈国兴,朱定华.土体动力黏塑性记忆型嵌套面本构模型及其验证[J].岩土工程学报,2006,28(10):1267-1272.
[3]Jeeho Lee,Gregory L,Fenves.Plastic-damage model for cyclic loading of concrete structures[J].Journal of Engineering Mechanics,1998,124(4):892-900.
[4]Lubliner J,Oliver J,Oller S,et al.A plastic-damage model for concrete[J].International Journal of Solids and Structures,1989,25(3):299-326.
[5]程建军,严三保,蒋建平,等.南京地铁南北线主要工程地震问题认识与评价[J].地球科学与环境学报,2004,26(1):46-51.
[6]楼梦麟,王文剑,朱彤等.土结构体系振动台模型试验中土层边界影响问题[J].地震工程与工程振动,2000,20(4):30-16.
[7]陈跃庆,吕西林,黄炜.结构地基相互作用振动台试验中土体边界条件的模拟方法[J].结构工程师,2000,16(3):20-30.
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