不同开挖方式下隧道稳定性分析
Analysis of Tunnel Stability Under Different Excavation Methods
陈强 1王强 1王宁 2曹学平3
作者信息
- 1. 陕西工业职业技术学院,陕西咸阳 712000;咸阳市黄土力学与灾害防治工程技术研究中心,陕西咸阳 712000
- 2. 陕西工业职业技术学院,陕西咸阳 712000
- 3. 陕西华山路桥集团有限公司,西安 710026
- 折叠
摘要
在隧道设计与施工中,超浅埋隧道的埋深较浅,岩土常常表现出不同程度的风化状况,在开挖过程中难以形成有效的支撑拱形结构,从而引发隧道的不稳定或坍塌.基于某新建高速铁路隧道工程案例,通过模型试验来探讨不同施工方法对隧道稳定性的影响.结果表明,开挖方法能够显著影响主支护结构中主应力的分布和幅度,进而影响围岩压力对初始支护的作用.扩大管棚布设范围可有效减少初始支撑结构在拱顶和隧道底部的最大拉应力,增强结构稳定性,而不对主要应力值产生负面影响.
Abstract
In tunnel design and construction,the buried depth of ultra-shallow tunnel is shallow.The soil often shows different degrees of weathering,which is difficult to form an effective support arch structure in the excavation process,resulting in the instability or collapse of the tunnel.Based on a new high-speed railway tunnel project,the study analyzes the influence of different construction methods on tunnel stability with through model tests.The results show that the excavation method can significantly affect the distribution and amplitude of the principal stress in the main support structure,and then affect the effect of surrounding rock pressure on the initial support.Expanding the range of pipe shed can effectively reduce the maximum tensile stress of the initial support structure at the vault and tunnel bottom,and enhance the stability of the structure without negatively affecting the main stress value.
关键词
开挖方式/隧道稳定性/室内试验Key words
Excavation mode/Tunnel stability/Laboratory test引用本文复制引用
基金项目
陕西工业职业技术学院自然科学重点项目(2023YKZD-006)
出版年
2024
NETL
NSTL
万方数据