基于围岩亚级分级的浅埋偏压隧道初期支护优化方法研究  

Optimization Method of Primary Support for Shallow Buried Tunnel under Unsymmetrical Pressure based on Surrounding Rock Sub-classification

作　　者：江杰[1,2,3] 蒲鸥 刘刚伯 欧孝夺[1,2] 赵建刚 谢规球 

机构地区：[1]广西大学土木建筑工程学院,南宁市530004 [2]广西大学工程防灾与结构安全重点实验室,南宁市530004 [3]桂林理工大学广西岩土力学与工程重点实验室,桂林市541004 [4]中交第四公路工程局有限公司,北京市100022

出　　处：《公路》2017年第2期218-223,共6页Highway

基　　金：国家自然科学基金项目;项目编号51568006;国家自然科学基金项目;项目编号41372361;广西岩土力学与工程重点实验室资助课题;项目编号14-KF-03

摘　　要：现行公路隧道岩质围岩分级方法采用岩石坚硬程度、岩体完整程度等常规的指标,且分级结果跨度较大,不能满足工程需要。在实际工程中,许多公路隧道会受到浅埋和偏压的影响。依托广西南宁玉象隧道,考虑采用埋深和偏压两个指标,用数值模拟的方法,根据隧道开挖后毛洞的自稳性对围岩进行亚级分级,在此基础上对不同亚级提出对应的初期支护方案。结果表明,该隧道围岩级别可以再分为3个亚级,研究结果对类似受到浅埋偏压影响隧道的初期支护设计和施工具有参考意义。The classification method of rocky surrounding rock in the current highway tunnel uses the normal indexes such as rock hardness degree, rock mass integrity and so on, and the classification results cannot meet the engineering requirements because of the large span result. Nowadays shallow buried tunnel under unsymmetrical pressure is common. We consider the effects of shallow buried and unsymmetrical pressure, numerical simulation is used to subdivide the classification of surrounding rock, which is based on self-stability of the tunnel without any supports. Furthermore, different sub- classifications are corresponded to different primary supports after the method of numerical simulation. This research is based on the Guangxi Yuxiang Tunnel project, and the surrounding rock classification can be subdivided into three grades. The result can provide reference for the design and construction of the tunnel in the similar geological conditions.

关 键 词：公路隧道 偏压浅埋 围岩亚级分级 初期支护 优化 研究 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]