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 discussed in the course of dynamic analysis. The text contrasts the result under static state with the result under dynamic 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.
出处
《建筑技术开发》
2009年第8期21-23,共3页
Building Technology Development
关键词
土钉支护
基坑
动力分析
有限差分
soil nailing wall
foundation pit
dynamic analysis
finite difference
