摘要
深基坑开挖降水过程中,坑内外压力差可能引起严重的工程事故。通过有限元软件MIDAS/GTS,采用渗流应力耦合理论及摩尔库伦模型,结合某桩锚复合支护深基坑工程实例建立三维有限元模型分析了该深基坑工程的变形情况,并与不考虑耦合的基坑变形情况进行对比,主要包括锚杆轴力图、桩剪力图与弯矩图、基坑地表沉降、坑底回弹、侧向位移等。结果表明:在两种不同的有限元模拟条件下基坑变形形态基本一致;总的来说,流固耦合分析引起的基坑变形小于不考虑耦合分析的基坑变形,支护结构的受力变形也较小,更接近实际情况。考虑地下水流固耦合分析对基坑变形的影响不容忽视,对实际工程的设计优化有一定的参考意义。
In the excavation and dewatering process of deep foundation pit,the internal and external pressure difference of pit will possibly cause the serious engineering accidents.By the finite element software MIDAS/GTS,based on the seepage stress interaction theory and Moore Kulun model,and combined with an engineering case of pile anchor compound support for deep foundation pit,3D finite element model is established to analyze the deformation of this deep foundation pit,and compares the deformation of foundation pit not considering the interaction,mainly including the anchor rod axial force diagram,pile shear diagram,pile bending moment diagram,foundation pit surface settlement,pit bed springback and lateral displacement.The result shows that the deformation types of foundation pit under the different finite element simulation conditions are basically same.In general,the deformation of foundation pit caused by the analysis of fluid-structure interaction is smaller than the deformation without the interaction analysis,and the stress deformation of supported structure is also smaller and is more close to the physical truth.It is not neglect to consider the influence of underground water fluid-structure interaction analysis on the deformation of foundation pit,which can be referred for the design optimization of engineering practices.
出处
《城市道桥与防洪》
2017年第7期292-296,共5页
Urban Roads Bridges & Flood Control
关键词
桩锚复合支护
渗流
流固耦合
变形
pile anchor compound support
seepage
fluid-structure interaction
deformation
