地震作用对隧道围岩稳定性影响分析  

Analysis of the influence of seismicaction on the stability of tunnel surrounding rock

作　　者：宋利 Song Li(China Railway 14th Bureau Group Fifth Engineering Co.,Ltd.,Jining Shandong 272000,China)

机构地区：[1]中铁十四局集团第五工程有限公司,山东济宁272000

出　　处：《山西建筑》2025年第9期147-151,共5页Shanxi Architecture

基　　金：复杂艰险地区超大型铁路工程施工重大安全风险预警与防控技术研究(项目编号:2021YFB2301803)。

摘　　要：断层破碎带地质条件复杂多样,在地震作用下,断层区域极易发生地质损害。为研究地震作用下跨断层隧道围岩稳定性,以重庆轨道交通15号线工程中梁山隧道为研究对象,运用FLAC~(3D)有限差分软件对不同断层倾角和断层宽度下隧道结构地震作用下变形特征进行模拟,并根据实际情况提出相应的治理措施。研究结果表明:断层前后位移变形速率保持稳定,当隧道穿越断层破碎带时,变形速率突增,破碎带主要影响范围为40 m~80 m,施工设计时应重点对破碎带及其两侧各10 m进行设防;断层倾角越大对隧道结构越有利,而断层宽度越大对隧道结构越不利;在地震作用下,隧道仰拱部位产生位移最大,右拱腰部位产生变形最明显,故在设计时应重点对仰拱+拱腰处进行设防。综合考虑,选用注浆加固进行治理,计算结果表明加固效果良好。The geological conditions of the fault fracture zone are complicated and varied,and the fault zone is easy to be destroyed under the action of earthquake.In order to study the stability of cross-fault tunnel surrounding rock under earthquake action,taking Zhongliangshan Rail Transit Line 15 as the research object,FLAC 3D finite difference software was used to simulate the deformation characteristics of tunnel structure under different fault angles and fault widths,and corresponding treatment measures were proposed according to the actual situation.The results show that the displacement and deformation rate before and after the fault remain stable,and the deformation rate increases abruptly when the tunnel passes through the fault fracture zone.The main influence range of the fracture zone is 40 m~80 m,and the construction design should focus on fortifying the fracture zone and 10 m on both sides.The larger the fault dip angle is,the more favorable the tunnel structure,while the larger the fault width is,the more unfavorable the tunnel structure.Under the action of earthquake,the displacement of the invert is the largest,and the deformation of the right arch is the most obvious.Therefore,the invert+waist should be fortified in the design.After comprehensive consideration,grouting reinforcement is selected for treatment,and the calculation results show that the reinforcement effect is remarkable.

关 键 词：城市轨道交通 断层破碎带 地震响应 围岩稳定性 数值模拟 

分 类 号：TU997[建筑科学—市政工程] U452.12[建筑科学—桥梁与隧道工程]