静钻根植竹节桩桩端承载性能数值模拟研究

发布时间：2018-06-25 14:28

本文选题：静钻根植工法 + 竹节桩　；参考：《岩土力学》2015年S1期

【摘要】：静钻根植竹节桩是一种新型组合桩基,桩端处存在的水泥土扩大头使其桩端承载性能优于传统桩基。通过模型试验以及ABAQUS三维建模计算对静钻根植竹节桩的桩端承载性能进行研究时发现,当桩端土体为砂土或黏性土时,预制竹节桩桩端处于水泥土扩大头中间位置附近时桩端极限承载力最大;当桩端持力层为岩石层时,竹节桩桩端与岩石层之间水泥土层厚度越小,桩端承载性能越好。由于现阶段静钻根植竹节桩主要用于东南沿海软土地区,实际工程中竹节桩桩端处于水泥土扩大头中间位置附近时桩端承载性能最好;桩端水泥土的内摩擦角、黏聚力以及弹性模量对静钻根植竹节桩桩端承载性能影响不大;增加水泥土扩大头的直径能够提高静钻根植竹节桩的桩端承载力。
[Abstract]:The static drilling and planting bamboo section pile is a new type of composite pile foundation. The pile end bearing capacity is better than that of the traditional pile foundation due to the existence of cement soil expansion head at the end of the pile. Through the model test and Abaqus 3D modeling calculation, it is found that when the pile end soil is sand or clay soil, the pile end bearing capacity of the static drilling-rooted bamboo node pile is studied. When the pile end of precast bamboo section is near the middle of the expanded head of cement soil, the ultimate bearing capacity of the pile end is the largest; when the bearing layer at the end of the pile is a rock layer, the thickness of cement soil layer between the pile end and the rock layer is smaller, and the bearing capacity of the pile end is better. At present, the static drilling and planting bamboo section pile is mainly used in the soft soil area of southeast coastal area, the bearing capacity of the pile end is the best when the pile end is near the middle position of the expanded head of cement soil in the actual engineering, and the internal friction angle of the cement soil at the end of the pile is the best. The cohesive force and elastic modulus have little influence on the bearing capacity of the pile end of the static drilling and planting bamboo section pile, and increasing the diameter of the expanded head of cement soil can improve the bearing capacity of the pile end of the static drilling root planting bamboo section pile.
【作者单位】：浙江大学滨海与城市岩土工程研究中心;浙江大学软弱土与环境土工教育部重点实验室;中淳高科桩业股份有限公司;
【基金】：国家自然科学基金(No.51278450,No.51378464)
【分类号】：TU473.1

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