论文部分内容阅读
降水与深基坑开挖卸荷是影响坑底工程桩工作性状的重要因素,应用有限元分析软件ABAQUS建立基坑开挖二维模型,综合考虑了降水及卸荷对坑底工程桩的影响,得出如下结论:降水能有效减少开挖引起的工程桩回弹及坑底土体回弹;前期降水增大了桩身轴向压应力而开挖卸荷使桩身拉应力逐渐增大;降水导致地基固结沉降从而使桩侧产生负摩阻力,降水深度越大,负摩阻力越大。考虑降水情况下桩的受力变形均小于不考虑降水情况下,因此,降水对减少坑底回弹及桩身受力变形有积极的作用。
Dewatering and unloading of deep foundation pit excavation is an important factor affecting the working performance of pit-bottom engineering piles. Two-dimensional model of foundation pit excavation is established by using finite element analysis software ABAQUS. The effects of precipitation and unloading on piles of pit engineering are comprehensively considered , It is concluded as follows: Precipitation can effectively reduce the engineering rebound caused by excavation and the rebound of the bottom of the pit; Precipitation increases the axial compressive stress of the pile and excavation unloading makes the pile tensile stress gradually increased ; Precipitation leads to the settlement of the foundation so that the pile side produce negative friction, the greater the depth of precipitation, the greater the negative friction. Under the condition of precipitation, the deformation of the pile is less than that without considering the precipitation. Therefore, the precipitation has a positive effect on reducing the bottom rebound and the deformation of the pile.