水平层状围岩离层特征及离层影响因素研究  

Research on the Characteristics and Influencing Factors of the Separation Layer of Horizontal Layered Surrounding Rock

作　　者：吴盛发 周旺 施作伟 隆家锟 WU Shengfa;ZHOU Wang;SHI Zuowei;LONG Jiakun(The Fifth Construction Co.,Ltd.of China Tiesiju Civil Engineering Group,Jiujiang,Jiangxi Province,332000 China;Guangxi Communications Design Group Co.,Ltd.,Nanning,Guangxi Zhuang Autonomous Region,530000 China;Nanning Wuxiang Jinzhong Investment Co.,Ltd.,Nanning,Guangxi Zhuang Autonomous Region,530000 China)

机构地区：[1]中铁四局集团第五工程有限公司,江西九江332000 [2]广西交通设计集团有限公司,广西南宁530000 [3]南宁五象金众投资有限责公司,广西南宁530000

出　　处：《科技资讯》2024年第8期137-139,共3页Science & Technology Information

摘　　要：以南宁市东风路水平层状岩体隧道为背景,通过理论分析和现场试验,研究了水平层状围岩的离层特征及离层影响因素。离层的形成,是由于相邻岩层间的不协调变形引起的。当相邻岩层的层厚或力学性质差异较大时,隧道围岩离层便会产生。此外,离层的产生还受到岩体结构、围岩力学特性、地应力以及洞室尺寸等因素的影响。离层的产生及发展范围还受到关键层所在位置的影响,关键层距开挖断面越近,受到关键层的支撑和阻挡作用,离层所能影响范围越小,当围岩中不存在关键层时,离层影响范围大致为洞室跨度的一半。研究对类似工程具有借鉴意义。Taking the tunnel of the Dongfeng Road in the horizontal layered rock mass in Nanning City as the background,the characteristics and influencing factors of the separation layer of horizontal layered surrounding rock are studied through theoretical analysis and field tests.The formation of the separation layer is caused by the uncoor-dinated deformation between adjacent strata.When the thickness or mechanical properties of adjacent rock strata are quite different,the separation layer of the surrounding rock of the tunnel will occur.In addition,the generation of the separation layer is also affected by factors such as the rock mass structure,the mechanical properties of sur-rounding rock,ground stress and the cavern size.The generation and development range of the separation layer is also affected by the location of the critical layer:the closer the critical layer is to the excavation section,the smaller the influence range of the separation layer is due to the support and blocking by the critical layer,and when there is no critical layer in surrounding rock,the influence range of the separation layer is roughly half of the span of the cavern.The study has reference significance for similar projects.

关 键 词：水平层状 岩体隧道 离层特征 关键层 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]