基于三维有限元数值计算的基坑支护分析研究

Research on foundation pit support analysis based on three-dimensional finite element numerical calculation

为研究基坑工程支护结构的可靠性,通过三维有限元数值计算与实际位移监测相结合,并对基坑支护结构内力进行分析,结果表明:通过数值模拟与实际监测位移结果对比,两者变化趋势保持相同,且数据差距较小;数值模拟出基坑的最大隆起变形(1.19cm)出现在底部,而基坑表面只出现0.5cm的沉降变形;通过桩轴力和锚杆内力分析,得到基坑右侧边坡产生的力较大;且锚杆和桩的轴力整体分布规律基本相同,即越靠近基坑外部,轴力越小。

In order to study the reliability of the foundation pit supporting structure,the three-dimensional finite element numerical calculation is combined with the actual displacement monitoring,and the internal force of the foundation pit supporting structure is analyzed.The results show that: through numerical simulation and actual monitoring displacement results,two The trend of change remains the same, and the data gap is small;the numerical simulation shows that the maximum uplift deformation of the foundation pit(1.19 cm) appears at the bottom,and only 0.5 cm of settlement deformation occurs on the surface of the foundation pit;the axial force of the pile and the internal force of the anchor are analyzed.The force generated by the right side slope of the foundation pit is relatively large;and the overall distribution law of the axial force of the anchor rod and the pile is basically the same,that is,the closer to the outside of the foundation pit,the smaller the axial force.