超大跨隧道分部开挖的压力拱特性分析  

On Pressure-Arch Characteristics of Super-Large-Span TunnelExcavated with Sequential Excavation Method

作　　者：刘夏冰 麻建飞 贾港帅 贺家新 王文谦 LIU Xiabing;MA Jianfei;JIA Gangshuai;HE Jiaxin;WANG Wenqian(Guangdong Hua-Lu Transport Technology Co.,Ltd.,Guangzhou 510420,China;Guangdong Provincial Key Laboratory of Tunnel Safety and Emergency Support Technology&Equipment,Guangzhou 510420,China;Beijing Jiaotong University,Beijing 100044,Chin;China Railway Engineering Consulting Group Co.,td.,Beijing 100055,China)

机构地区：[1]广东华路交通科技有限公司,广州510420 [2]广东省隧道工程安全与应急保障技术及装备企业重点实验室,广州510420 [3]北京交通大学,北京100044 [4]中铁工程设计咨询集团有限公司,北京100055

出　　处：《北京工业职业技术学院学报》2023年第2期1-5,54,共6页Journal of Beijing Polytechnic College

基　　金：广东省重点领域研发计划资助项目(2022B0101070001);中铁大桥局集团第四工程有限公司资助项目(CL19048530)。

摘　　要：为研究分部开挖下超大跨隧道的压力拱演化规律,通过室内试验方法进行岩块力学试验,结合现场调查获取的岩体质量评分,采用Hoek-Brown岩体强度准则确定围岩力学参数,采用数值模拟方法研究四线高铁隧道的压力拱特性。结果表明:分部开挖使超大跨隧道的压力拱逐步形成,初支35cm厚时四线高铁隧道形成压力拱的临界覆土为38m;合理的初支厚度能促进压力拱的形成,但超出临界范围时对压力拱的影响有限;双侧壁导坑法对压力拱形成的控制效果优于三台阶法。研究成果可为隧道支护设计提供参考。In order to study the evolution law of pressure-arch in super large span tunnels with Sequential Excavation Method(SEM),rockmass mechanical tests were conducted using laboratory testing methods.Combined with the rockmass quality scores obtained from on-site investigations,the Hoek-Brown rockmass strength criterion was used to delermine the mechanical parameters of the surounding rock.Numerical simulation methods were used to study the pressure-arch characteristics of the four-line high-speed railway tunnel.The results show that the sequential excavation gradually forms the pressure-arch of the super-large-span tunnel,and the critical soil cover for the formation of pressure-arch in the four-line high-speed railway tunnel is 38 meters when the initial support is 35 cm thick.A reasonable initial support thickness can promote the formalion of pressure arches,but the impact on pressure arches is limited when it exceeds the critical range.The control effect of thedouble-side drift method on the formation of pressure-arch is better than the three-bench method.The researchresults can provide reference for tunnel support design.

关 键 词：隧道工程 超大跨隧道 压力拱 分部开挖 围岩稳定 

分 类 号：U452.28[建筑科学—桥梁与隧道工程]