非饱和土深基坑支护结构变形的有限元分析
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摘要
随着城市高层建筑的大量兴建与地下空间开发利用规模的加大,随之出现了大量的深基坑工程。针对深基坑支护结构变形的复杂性与变形控制的重要性,结合实际深基坑工程,首先利用三轴试验,测得土体在不同含水率情况下的抗剪强度参数。而后以此为基础,应用PLAXIS软件建立了有限元分析模型,进行了非饱和土深基坑支护结构变形的数值模拟计算,总结出非饱和土深基坑支护结构的变形特性与规律,这为非饱和土深基坑工程的设计与施工提供了参考。
With the large number of urban high-rise building construction and the increasing scale of underground space exploitation,deep foundation pits have been widely used in engineering practice.Aiming at the complexity of retaining structure deformation and the importance of deformation control in deep foundation pits,combined with the real deep foundation pit,the shear strength parameters under different water content soils were experimented through the triaxial tests. The finite element analysis model was established using the PLAXIS software based on those shear strength parameters.The numerical simulation calculation of the deformation characteristics of deep foundation pits in unsaturated soil was done.The deformation characteristics and laws were put forward.It could offer reference to the design and construction of deep foundation pits in unsaturated soil.
With the large number of urban high-rise building construction and the increasing scale of underground space exploitation,deep foundation pits have been widely used in engineering practice.Aiming at the complexity of retaining structure deformation and the importance of deformation control in deep foundation pits,combined with the real deep foundation pit,the shear strength parameters under different water content soils were experimented through the triaxial tests. The finite element analysis model was established using the PLAXIS software based on those shear strength parameters.The numerical simulation calculation of the deformation characteristics of deep foundation pits in unsaturated soil was done.The deformation characteristics and laws were put forward.It could offer reference to the design and construction of deep foundation pits in unsaturated soil.
引文
[1]秦四海.深基坑工程优化设计[M].北京:地震出版社, 1998.(QIN Si-hai.Optimizing design of deep foundation pit engineering[M].Beijing:Seismic Publishing House,1998. ??(in Chinese))
[2]李萍,李奕.深基坑土钉支护结构的三维有限元分析[J].甘肃科学学报,2008(1):143-147.(LI Ping,LI Yi.3-D FEM analysis of soil nailed wall for deep foundation excavation[J].Journal of Gansu Sciences,2008(1):143 - 147. (in Chinese))
[3]刘中宪,雷礼钢,管志勇,郭华磊.某软土深基坑的非线性三维有限元分析[J].沈阳理工大学学报,2007(4):88-90. (LIU Zhong-xian,LEI Li-gan,GUAN Zhi-yong,GUO Hua-lei.A non linear 3D FEA of an excavation pit on soft ground[J].Transactions of Shenyang Ligong University, 2007(4):88 - 90.(in Chinese))
[4]金雪莲,樊有维,李春忠,刘芝平.带撑式基坑支护结构变形影响因素分析[J].岩石力学与工程学报,2007(增1): 3242 - 3249.(JIN Xue-lian,FAN You-wei,LI Chun-zhong, LIU Zhi-ping.Analysis of factors affecting support structure deformation of foundation pit with brace[J].Chinese Journal of Rock Mechanics and Engineering,2007(S1):3242 - 3249. (in Chinese))
[5]窦远明,刘熙媛,等.河北省非饱和土深基坑破坏机理研究报告[R].石家庄:河北工业大学,2008.(DOU Yuan-ming,LIU Xi-yuan,et al.The research report of unsaturated soil deep foundation pit failure mechanism in Hebei Province[R].Shijiazhuang:Hebei University of Technology,2008.(in Chinese))
[2]李萍,李奕.深基坑土钉支护结构的三维有限元分析[J].甘肃科学学报,2008(1):143-147.(LI Ping,LI Yi.3-D FEM analysis of soil nailed wall for deep foundation excavation[J].Journal of Gansu Sciences,2008(1):143 - 147. (in Chinese))
[3]刘中宪,雷礼钢,管志勇,郭华磊.某软土深基坑的非线性三维有限元分析[J].沈阳理工大学学报,2007(4):88-90. (LIU Zhong-xian,LEI Li-gan,GUAN Zhi-yong,GUO Hua-lei.A non linear 3D FEA of an excavation pit on soft ground[J].Transactions of Shenyang Ligong University, 2007(4):88 - 90.(in Chinese))
[4]金雪莲,樊有维,李春忠,刘芝平.带撑式基坑支护结构变形影响因素分析[J].岩石力学与工程学报,2007(增1): 3242 - 3249.(JIN Xue-lian,FAN You-wei,LI Chun-zhong, LIU Zhi-ping.Analysis of factors affecting support structure deformation of foundation pit with brace[J].Chinese Journal of Rock Mechanics and Engineering,2007(S1):3242 - 3249. (in Chinese))
[5]窦远明,刘熙媛,等.河北省非饱和土深基坑破坏机理研究报告[R].石家庄:河北工业大学,2008.(DOU Yuan-ming,LIU Xi-yuan,et al.The research report of unsaturated soil deep foundation pit failure mechanism in Hebei Province[R].Shijiazhuang:Hebei University of Technology,2008.(in Chinese))
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