下伏采空区对公路隧道影响的敏感性分析  

Sensitivity Analysis of Influence of Under Lying Goaf on Highway Tunnel

作　　者：田娇[1] 刘晓勇[1] 春军伟[1] 曾仲毅[1] 龚建伍[2] TIAN Jiao;LIU Xiaoyong;CHUN Junwei;ZENG Zhongyi;GONG Jianwu(Guizhou Transportation Planning Survey & Design Academe Co., Ltd., Guiyang 550081, China;School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430081, China)

机构地区：[1]贵州省交通规划勘察设计研究院股份有限公司,贵阳550081 [2]武汉科技大学城市建设学院,武汉430081

出　　处：《交通科技》2022年第1期77-81,共5页Transportation Science & Technology

基　　金：贵州省交通运输厅科技项目(2008011,2018-141-025)资助。

摘　　要：为研究隧道穿越下伏采空区段时围岩受采空区的影响规律,并为确定公路隧道下伏采空区的合适处治方案提供理论依据,采用数值模拟方法,分析总结采空区施工对围岩的主要影响规律,探讨下伏采空区对隧道影响的安全距离,总结下伏采空区水平宽度不敏感影响范围。结果表明:①上覆及下伏采空区对公路隧道的影响比并行采空区更为显著,且采空区的跨度相对采空区高度对隧道影响更大;②V级、IV级及III级围岩条件下,下伏采空区与隧道显著影响净距分别约为3.0D(D为隧道开挖跨度)、2.5D、1.5D;③下伏采空区水平尺寸不敏感临界值约为2.5D,即采空区尺寸在该范围内时,其尺寸变化对隧道的影响相对不敏感,超过该范围时,对隧道的影响显著增加。In order to study the influence law of the surrounding rock under the goaf when the tunnel passes through the underground goaf,and to provide a theoretical basis for determining the appropriate treatment scheme of the goaf under highway tunnel,the numerical simulation method is used to analyze and summarize the main influence law of goaf construction on surrounding rock,the safety distance of the influence of the underground goaf on the tunnel is discussed,and the insensitive influence range of the horizontal width of the underlying goaf is given.The results show as follows.Firstly,the influence of overlying and underlying goaf on highway tunnel is more significant than that of parallel goaf,and the span of goaf has a greater impact on the tunnel than the mining height.Secondly,under the conditions of grade V,IV and III surrounding rock,the significant influence net distance between the underlying goaf and the tunnel is about 3.0 D(D is the tunnel excavation span),2.5 D and 1.5 D.Thirdly,the critical insensitive value of the horizontal size of the underlying goaf is about 2.5 D,that is,when the size of the goaf is within this range,the influence of its size change on the tunnel is relatively insensitive,When the size of the goaf is beyond this range,the influence on the tunnel increases significantly.

关 键 词：下伏采空区 公路隧道 影响规律 安全距离 敏感性 

分 类 号：U456[建筑科学—桥梁与隧道工程]