深基坑支护体系冻胀变形数值分析

Frost Heaving Deformation Numerical Analysis of Deep Foundation Pit Support System

季节性冻土区域的基坑工程可能会经历过冬,其支护结构会受到土体冻胀的影响。研究了土体冻胀引起的深基坑支护结构变形问题。基于冻胀理论分析了土体冻胀对基坑支护结构的影响机理。结合具体工程实例构建了土体温度场与应力场基本方程,定义了有限元分析的相关热力参数和力学参数。利用ANSYS有限元分析软件模拟了温度变化、锚杆轴力变化和桩身水平位移变化。模拟结果与实践监测结果基本一致,取得了良好的模拟效果,为后续类似深基坑越冬工程提供了参考。

The foundation pit works may experience winter in the seasonal frozen soil area, and its supporting structure will be affected by the frost heaving of the soil. In this paper, the deformation problem is studied of deep foundation pit supporting structure caused by soil frost heave. Firstly, based on the frost heaving theory, the influence mechanism of soil frost heave is analyzed on the foundation pit supporting structure. Then, the basic equations of temperature field and stress field of soil are constructed, based on specific engineering example and the relevant, thermal parameters and mechanical parameters of finite analysis are defined. Finally,the ANSYS finite element analysis software was used to simulate the temperature change,the axial force change of the anchor and the horizontal displacement of the pile. The simulation results are basically consistent with the practical monitoring results, and good simulation results have been obtained,which provides a reference for the subsequent wintering projects like deep foundation pits.