关于川东红层近水平岩层隧道选线与围岩级别划分的探讨  

Discussion on Route Selection and Surrounding Rock Classification of Tunnel in Near-horizontal Rock Stratum of Eastern Sichuan

作　　者：卢爱民 Lu Aimin(China Railway fifth survey and Design Institute Group Co.,Ltd.,Beijing 102600,China)

机构地区：[1]中铁第五勘察设计院集团有限公司,北京102600

出　　处：《科学技术创新》2022年第4期126-129,共4页Scientific and Technological Innovation

摘　　要：汉巴南铁路巴中至南充段位于四川省东北部。褶皱宽缓、岩层近乎水平、软硬岩层互层分布是区内工程地质的典型特征。结合现场隧道施工情况,对坍塌、掉块的现象总结分析,得出了区内隧道围岩的工程特性、坍塌掉块机理,并总结不同岩性组合关系对围岩级别划分的影响,提出了适宜于区域内水平岩层的选线原则、开挖工法、初期支护建议,可为区内类似地质条件下的隧道设计和施工提供借鉴。The Bazhong Nanchong railway is a part of Hanbanan Railway, located in the northeast of Sichuan Province.The typical characteristics of engineering geology in this area are wide and gentle fold, nearly horizontal rock layer and alternating distribution of soft and hard rock layer.Combined with on-site tunnel construction, this paper summarizes and analyzes the phenomena of collapse and block falling, obtains the engineering characteristics and mechanism of collapse and block falling of surrounding rock in the region, summarizes the influence of different lithologic combinations on the classification of surrounding rock, and puts forward the line selection principle, excavation method and initial support suggestions suitable for horizontal rock strata in the region, which can provide reference for tunnel design and construction under similar geological conditions in the region.

关 键 词：川东红层 水平岩层 坍塌掉块机理 初期支护 

分 类 号：U452.13[建筑科学—桥梁与隧道工程]