大断面隧道揭急倾斜突出煤层临界安全岩柱厚度  

Critical Safety Rock Pillar Thickness of Large Cross Section Tunnel Excavating Steeply Inclined and Outburst Coal Seam

作　　者：马强 邹智波 黄飞[3] 李树清[3] MA Qiang;ZOU Zhibo;HUANG Fei;LI Shuqing(Guizhou Expressway Group Co.,Ltd.,Guiyang 550001,China;Zhejiang Jiaogong Hongtu Transportation Construction Co.,Ltd.,Hangzhou 310000,China;Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]贵州高速公路集团有限公司,贵州贵阳550001 [2]浙江交工宏途交通建设有限公司,浙江杭州310000 [3]湖南科技大学南方煤矿瓦斯与顶板灾害预防控制安全生产重点实验室,湖南湘潭411201

出　　处：《湖南科技大学学报（自然科学版）》2021年第2期7-12,共6页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：湖南省教育厅科学研究项目优秀青年项目资助(19B201);浙江省建筑业技术创新协会2018年科研项目一般项目资助(2018B02)。

摘　　要：为了降低公路隧道大断面石门揭煤的施工风险,以松坎隧道穿越急倾斜煤层施工为工程依托,采用理论手段估算了安全岩柱的厚度,并结合工程现场分析了开挖过程中的围岩破坏特征,从塑性变形与应力分布2个角度提出了对应的岩石破坏判据.采用FLAC^(3D)软件建立了隧道穿越急倾斜煤层施工的三维模型,对比分析了掌子面前方距煤层不同位置的塑性破坏特征与应力分布规律.根据研究结果并充分考虑隧道现场情况,最终选择9 m作为松坎隧道穿越急倾斜突出煤层施工的安全岩柱厚度.In order to reduce the construction risk of uncovering coal at large cross-sections of highway tunnels,based on the construction of Songkan tunnel crossing steep coal seam,the thickness of safety rock pillar was estimated by theoretical means,and the failure characteristics of surrounding rock in the excavation process combination with the engineering site.Corresponding rock failure criteria were proposed from the perspectives of plastic deformation and stress distribution.The three-dimensional model of tunnel construction through steeply inclined coal seam was established by using FLAC^(3D )software,and the plastic failure characteristics and stress distribution law at different positions in front of the face of the tunnel were compared and analyzed.Research results show that the value of safe rock pillar should not be less than 9 meters for construction of Songkan tunnel crossing steep inclined outburst coal seam.

关 键 词：瓦斯隧道 急倾斜突出煤层 安全岩柱 塑性破坏 应力变化 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]