软土地区基坑围护结构抗震性能数值模拟研究
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摘要
为研究软土地区常用基坑支护结构形式的抗震性能,分别建立了基坑的重力式、悬臂式、内支撑式以及锚拉式围护结构的有限元模型,分析了水平地震作用下不同支护结构与土体的动力响应规律,以及基坑的整体稳定性特征。研究发现,地震荷载作用下,基坑支护结构及场地土体的力学状态均发生一定程度的劣化,其中内支撑和锚拉式围护结构的塑性区和结构内力的变化幅度显著低于重力式和悬臂式围护结构,因此其抗震效果优于后两者。
In order to study the seismic safety of difference retaining structures for foundation pit in soft soil area,some finite elements models are made to simulate the gravity type,cantilever type,interior retaining type and sheet-pile type retaining structure of foundation pit.The dynamic response performance and the whole safety of retaining structure are analyzed.The simulation results show that the mechanic status of retaining structure and soil became worse under the seismic load.The results of plastic zone and the internal force show that the interior type and sheet-pile type retaining structure are much safer than other retaining structure patterns.
In order to study the seismic safety of difference retaining structures for foundation pit in soft soil area,some finite elements models are made to simulate the gravity type,cantilever type,interior retaining type and sheet-pile type retaining structure of foundation pit.The dynamic response performance and the whole safety of retaining structure are analyzed.The simulation results show that the mechanic status of retaining structure and soil became worse under the seismic load.The results of plastic zone and the internal force show that the interior type and sheet-pile type retaining structure are much safer than other retaining structure patterns.
引文
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[2]刘宗贤,李玉亭.桩基础在阻尼与分层弹性地基场地土波动影响下的横向地震反应分析[J].地震工程与工程振动,1994,14(3):47～59Liu Zong-xian,Li Yu-ting.The Lateral Seismic ResponseAnalysis for the Pile Foundation under the Influence ofDamping and Layer Elasto-Foundation Bed Site Soil WaveMotion[J].Earthquake Engineering and EngineeringVibration,1994,14(3):47～59(in Chinese)
[3]王慧,杨光辉,张鸿儒.桩-土体系运动相互作用参数分析[J].工程力学,1998(增):527～533Wang Hui,Yang Guang-hui,Zhang Hong-ru.ParameterAnalysis of Interaction on Pile-Soil Movement System[J].Engineering Mechanics,1998(Supp.):527～533(inChinese)
[4]张崇文,赵剑明,张社荣.桩-土作用的动力非线性反应层元法[J].岩士工程学报,1996,18(4):1～10Zhang Chong-wen,Zhao Jian-ming,Zhang She-rong.Dynamic Nonlinear Finite Layer element Method for Pile-Soil Interaction Analysis[J].Chinese Journal ofGeotechnical Engineering,1996,18(4):1～10(inChinese)
[5]李小军.非线性场地地震反应分析方法的研究[D].哈尔滨:国家地震局工程力学研究所,1993Li Xiao-jun.Research on Seismic Response AnalysisMethod Nonlinear-Site[D].Harbin:Institute ofEngineering Mechanics,CEA,1993(in Chinese)
[6]庄海洋.土-地下结构非线性动力相互作用及其大型振动台试验研究[D].南京:南京工业大学,2006Zhuang Hai-yang.Study on Nonlinear Dynamic Soil-Underground Structure Interaction and Its Large-SizeShaking Table Test[D].Nanjing:Nanjing University ofTechnology,2006(in Chinese)
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