A calculation method for Rock-socketed depth of highway bridge pile based on Hoek-Brown strength criterion

LEI Yong; LIU Ze

doi:10.16285/j.rsm.2015.02.022

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A calculation method for Rock-socketed depth of highway bridge pile based on Hoek-Brown strength criterion

更新时间：2026-06-25

- A calculation method for Rock-socketed depth of highway bridge pile based on Hoek-Brown strength criterion
- Vol. 36, Issue 2, Pages: 457-462(2015)
- 作者机构：
  
  湖南科技大学土木工程学院,湖南,湘潭,411201
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2015.02.022
  CLC： TU473.1
- Online First：13 June 2018，
  
  Published：2015
- 稿件说明：
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LEI Yong, LIU Ze. A calculation method for Rock-socketed depth of highway bridge pile based on Hoek-Brown strength criterion[J]. 2015, 36(2): 457-462.
DOI：

LEI Yong, LIU Ze. A calculation method for Rock-socketed depth of highway bridge pile based on Hoek-Brown strength criterion[J]. 2015, 36(2): 457-462. DOI： 10.16285/j.rsm.2015.02.022.

摘要

基于Hoek-Brown强度准则，推导了在微小转动下嵌岩段桩侧法向应力及水平摩阻力计算模型，采用静力平衡原理建立了水平荷载作用下公路桥梁桩基嵌岩深度的计算公式，提出了嵌岩深度计算的新方法。参数敏感性及影响因素分析表明：（1）水平荷载引起的力矩、桩径d、岩层上覆压力、岩石单轴抗压强度、岩体类别参数、岩体地质力学分类指标RMR均对嵌岩深度有一定影响，在、d不变的情况下，岩体质量和岩石单轴抗压强度对嵌岩深度的确定最为敏感；（2）岩体质量越差，所需嵌岩深度越大；岩体质量越好，岩层上覆压力对嵌岩深度影响越小，反之越大。（3）嵌岩深度随岩石单轴抗压强度的提高呈非线性缓慢地减小，在相同的单轴抗压强度下，岩体质量越好，嵌岩深度越小，反之越大。

Abstract

Based on the Hoek-Brown strength criterion

a calculation model of pile lateral normal stress and horizontal friction under small rotation is obtained. Using static equilibrium principle

a calculation formula for the rock-socketed depth of the highway bridge pile foundation under horizontal load is established. Furthermore

a new calculation method of rock-socketed depth is proposed. The analyses of parameter sensitivities and influence factors show that: (1) the torque caused by horizontal load

pile diameter d

strata overlying pressure

rock uniaxial compressive strength

rock mass category parameter and the rock geomechanical classification index RMR have certain influences on the rock-socketed depth. While

d are unchanged

the rock quality and rock uniaxial compressive strength are the most sensitive factor to determine of rock-socketed depth. (2) The worse the rock mass quality is

the greater the rock-socketed depth is; the better the rock mass quality is

the smaller the influence of overlying pressure on the rock-socketed depth is

vice versa. (3) The rock-socketed depth nonlinearly decreases slowly with the increasing of rock uniaxial compressive strength

and under the same uniaxial compressive strength

the better the rock mass quality is

the smaller the rock-socketed depth is

vice versa.

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