不同开挖方式下隧道稳定性分析  

Analysis of Tunnel Stability Under Different Excavation Methods

作　　者：陈强 王强[1,2] 王宁 曹学平[3] Chen Qiang;Wang Qiang;Wang Ning;Cao Xueping(Shaanxi Polytechnic Institute,Xianyang 712000,China;Xianyang Engineering Technology Research Center for Loess Mechanics and Disaster Prevention,Xianyang 712000,China;Shaanxi Huashan Road and Bridge Group Co.,LTD.,Xi’an 710026,China)

机构地区：[1]陕西工业职业技术学院,陕西咸阳712000 [2]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 [3]陕西华山路桥集团有限公司,西安710026

出　　处：《黑龙江科学》2024年第14期98-100,104,共4页Heilongjiang Science

基　　金：陕西工业职业技术学院自然科学重点项目“富水砂层连拱隧道近接施工管幕支护力学性能与作用机理研究”(2023YKZD-006)。

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。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 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]