文档介绍：
基于圆孔扩张理论的嵌岩桩侧摩阻力研究#
邢皓枫,王鲁杰*
(同济大学地下建筑与工程系)
5
10
摘要:嵌岩桩嵌岩段桩侧摩阻力不仅与桩周岩体性质有关,而且与桩身受到桩顶荷载产生的
径向力有关。根据圆孔扩张理论,确定了桩侧岩体的塑性区,并结合剪切理论,给出了嵌岩
桩桩侧摩阻力的计算公式。结果表明嵌岩桩嵌岩段的径向力是一个与桩的半径、泊松比及桩
周岩体性质相关的变量,对桩侧岩体的影响范围随着桩径的增大而减小,而桩与岩体的相对
刚度越大,其径向力和桩侧阻力却越小;在弹塑性交界面处的径向应力可由岩体性质及所处
深度唯一确定,而与桩径无关。通过与工程算例对比分析,表明本文计算方法与实测值吻合
较好,对实际工程具有一定的参考价值。
关键词:圆孔扩张理论;嵌岩桩;抗剪强度
中图分类号:TU473
15
Research on the Shaft Resistance of Rock-socketed Piles
Based on Cavity Expansion Theory
Xing Haofeng , Wang Lujie
20
25
30
35
40
(Department of geotechnical Engineering, Tongji University )
Abstract: The shaft resistance of socketed piles not only have close relationship with the characteristic
of its surrounding rock, but also are related to the radial force caused by the top load. Based on the
theories of cavity expansion and shear strength, the plastic area of the rock rounding pile is determined
in this paper, and the friction formula is proposed as well. The research results show that the radial
force of the socketed section in rock-socketed pile is a variable which is related to pile diameter,
Poisson’s ratio and properties of the rock mass around pile. With the increase of the pile diameter, the
influence area of rock around pile will reduce, and its radial force and lateral friction will also decrease
with the increasing of the relative stiffness between pile and rock. The radial stress of t