土钉支护基坑动力分析
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摘要
利用有限差分FLAC-3D程序对土钉支护基坑进行了动力分析,基于土体和土钉相互作用及协同工作,建立局部三维有限差分模型。进行基坑动力分析时,讨论了如何设置边界条件、输入地震波、为地质体选择合适的阻尼比,对比了静力分析和动力分析的结果,研究了地震烈度、土钉长度及土钉间距对基坑水平位移峰值和土钉最大轴力的影响。结果表明:随着烈度的增大,基坑水平位移峰值、土钉最大轴力都在增大;随着土钉长度的增加,基坑水平位移峰值、土钉最大轴力均减少;随着土钉间距的减小,基坑水平位移峰值、土钉最大轴力均减少。
Dynamic analysis on foundation pit protected by soil nailing wall is made with finite difference FLAC -3D. On the base of interaction and works together between soil and nail, partial three-dimensional finite difference model is formed. The problems about boundary conditions, seismic wave, and rational damping for geological body are dis- cussed in the course of dynamic analysis. The text contrasts the result under static state with the result under dynam- ic analysis. The object of study includes influence of the earthquake intensity, the soil nail length and the soil nail space upon the seismic foundation pit level peak displacement and soil nail peak axial force. The result of analysis shows that foundation pit level peak displacement and soil nail peak axial force increase with earthquake intensity augmenting and decrease as soil nail length increases and soil nail space becomes smaller.
Dynamic analysis on foundation pit protected by soil nailing wall is made with finite difference FLAC -3D. On the base of interaction and works together between soil and nail, partial three-dimensional finite difference model is formed. The problems about boundary conditions, seismic wave, and rational damping for geological body are dis- cussed in the course of dynamic analysis. The text contrasts the result under static state with the result under dynam- ic analysis. The object of study includes influence of the earthquake intensity, the soil nail length and the soil nail space upon the seismic foundation pit level peak displacement and soil nail peak axial force. The result of analysis shows that foundation pit level peak displacement and soil nail peak axial force increase with earthquake intensity augmenting and decrease as soil nail length increases and soil nail space becomes smaller.
引文
[1] 李岩,孙剑平,魏焕卫.复合土钉支护数值模拟与实测分析[J]. 山东建筑大学学报,2008,23(3) :208-212
[2] 刘耀儒,刘元高,周维恒,等.应用FLAC方法进行动力分析[J]. 岩石力学与工程学报,2001,20(2) :1518-1522
[3] 何伟,周立军,赵洋.深基坑土钉墙支护施工仿真分析[J].四川建筑科学研究,2007,33(2) :108-112
[4] 刘立平.水平地震作用下桩-土-上部结构弹塑性动力相互作用分析[D].重庆大学博士学位论文,2004
[5] 严松宏.地下结构随机地震响应分析及其动力可靠度研究[D]. 西南交通大学博士学位论文,2003
[6] 陶明星.土-地下结构动力相互作用有限元分析[D].西北工业大学硕士学位论文,2004
[7] 李文涛.地震波作用下地下结构动态分析数值仿真[D].哈尔滨工程大学硕士学位论文,2003
[8] 朱彬.城市地下工程结构抗震分析研究[D].西安科技大学硕士学位论文,2005
[9] 国胜兵,赵毅,赵跃堂,等.地下结构在竖向和水平地震荷载作用下的动力分析[J].地下空间,2002,22(4) :314-319
[10] 刘波,韩彦辉.FLAC原理、实例与应用指南[M].北京:人民交通出版社,2005
[2] 刘耀儒,刘元高,周维恒,等.应用FLAC方法进行动力分析[J]. 岩石力学与工程学报,2001,20(2) :1518-1522
[3] 何伟,周立军,赵洋.深基坑土钉墙支护施工仿真分析[J].四川建筑科学研究,2007,33(2) :108-112
[4] 刘立平.水平地震作用下桩-土-上部结构弹塑性动力相互作用分析[D].重庆大学博士学位论文,2004
[5] 严松宏.地下结构随机地震响应分析及其动力可靠度研究[D]. 西南交通大学博士学位论文,2003
[6] 陶明星.土-地下结构动力相互作用有限元分析[D].西北工业大学硕士学位论文,2004
[7] 李文涛.地震波作用下地下结构动态分析数值仿真[D].哈尔滨工程大学硕士学位论文,2003
[8] 朱彬.城市地下工程结构抗震分析研究[D].西安科技大学硕士学位论文,2005
[9] 国胜兵,赵毅,赵跃堂,等.地下结构在竖向和水平地震荷载作用下的动力分析[J].地下空间,2002,22(4) :314-319
[10] 刘波,韩彦辉.FLAC原理、实例与应用指南[M].北京:人民交通出版社,2005
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