非等断面交叉洞室三角区围岩应力集中理论研究#br#

刘宁; 黄义雄; 蔡炜; 陈坤

doi:10.3973/j.issn.2096-4498.2021.05.011

隧道建设 >

2021 , Vol. 41 >Issue 5: 781 - 788

DOI: https://doi.org/10.3973/j.issn.2096-4498.2021.05.011

研究与探索

非等断面交叉洞室三角区围岩应力集中理论研究#br#

刘宁 ,
黄义雄 ,
蔡炜 ,
陈坤

展开

（贵州大学土木工程学院，贵州贵阳 550025）

刘宁（1984—），男，山东济宁人，2017年毕业于中南大学，隧道工程专业，博士，副教授，现从事隧道与地下工程研究工作。E-mail： guidaketizu@163.com。

网络出版日期: 2021-05-29

基金资助

贵州省基础研究计划（基金）（黔科合基础［2020］1Y250）；贵州省科技支撑计划项目（黔科合支撑［2020］2Y036）；贵州大学人才引进科研项目（贵大人基合字（2017）62号）；贵州省普通高等学校青年科技人才成长项目（黔教合KY字［2021］101）

收起

Theoretical Analysis of Stress Concentration Distribution of Surrounding Rock in Triangle Area of NonEqualSection Crossed Caverns

LIU Ning ,
HUANG Yixiong ,
CAI Wei ,
CHEN Kun

Expand

(College of Civil Engineering, Guizhou University, Guiyang 550025, Guizhou, China)

Online published: 2021-05-29

Fold

摘要

为研究非等断面洞室的围岩稳定性，对其交叉口处应力集中现象进行理论推导，以不同断面尺寸（两洞室间洞径差异为2、3、4倍）和不同交叉角度的交叉洞室三角区围岩破坏规律进行分析，得到其围岩应力变化规律。以贵阳市某人防扩建工程为算例，将理论、数值模拟计算结果进行对比，结果表明： 1）随着交叉洞室间断面尺寸差异的增大，三角区围岩的应力集中系数K主要在大断面一侧分布范围增大； 2）随着交叉洞室夹角的增大（30～90°），三角区围岩垂直应力减小，在垂直相交时最安全； 3）2、3、4倍洞径差异时，在交叉顶点范围内围岩应力集中系数K的最大值分别为3.83、3.60、3.21，表明实际工程中，该部分发生破坏的可能性最大； 4）三角区围岩垂直应力为明显的偏压分布，并呈现出曲边三角形的分布形状。

关键词： 地下工程; 交叉洞室; 三角区围岩应力; 应力集中; 断面差异

本文引用格式

刘宁 , 黄义雄 , 蔡炜 , 陈坤 . 非等断面交叉洞室三角区围岩应力集中理论研究#br#[J]. 隧道建设, 2021 , 41(5) : 781 -788 . DOI: 10.3973/j.issn.2096-4498.2021.05.011

Abstract

To study the stability of the surrounding rock of nonequalsection crossed caverns, stress concentration phenomena at the intersection are theoretically deduced. Failure laws of the surrounding rock at the triangle area of crossed caverns with various diameter differences and crossed angles are analyzed, and the stress variation law of the surrounding rock is obtained. Comparisons and contrasts are made between the theoretical calculation and numerical simulation results of a civil defense enlargement project in Guiyang, and the results show the following. (1) The stress concentration coefficient K of the surrounding rocks distributed on the side of the cavern with a large section diameter. (2) With an increase in the crossed angle (from 30° to 90°), the vertical stress of the surrounding rock in the triangle area decreases, and the construction condition is the safest when the caverns vertically intersect. (3) When the hole diameter difference is two, three, and four times, the maximum value of K in the surrounding rock at the crossed top is 3.83, 3.60, and 3.21, respectively, indicating that the possibility of failure in this part of the actual project is the highest. (4) The vertical stress of the surrounding rock in the triangle area shows an obvious bias distribution and presents a curved triangle distribution shape.

Key words： underground engineering; crossed caverns; surrounding rock stress in triangle area; stress concentration; sectional difference

Options

文章导航

〈

〉

模态框（Modal）标题

摘要

本文引用格式

Abstract