浅埋大跨度黄土隧道变形特征及控制措施研究  

Study on Deformation Characteristics and Control Measures of Shallow Large-span Loess tunnels

作　　者：陈培帅[1,2] 王伟 吴忠仕[1,4] 袁青 江鸿 翟世鸿 CHEN Peishuai;WANG Wei;WU Zhongshi;YUAN Qing;JIANG Hong;ZHAI Shihong(CCCC Second Harbor Engineering Co.,Ltd,Wuhan 430040;Shaanxi Provincial Major Laboratory for Highway Bridge&Tunnel,Chang'an University,Xi′an 710064;CCCC Highway Bridges National Engineering Research Centre CO.,Ltd.,Beijing 100088;Research and Development Center of Intelligent Manufacturing Technology for Transportation Infrastructure in the Transportation Industry,Wuhan 430040;Key Laboratory of Long Bridge Construction Technology for Transportation Industry,Wuhan 430040)

机构地区：[1]中交第二航务工程局有限公司,武汉430040 [2]长安大学陕西省公路桥梁与隧道重点实验室,西安710064 [3]中交公路长大桥建设国家工程研究中心有限公司,北京100088 [4]交通运输行业交通基础设施智能制造技术研发中心,武汉430040 [5]长大桥梁建设施工技术交通行业重点实验室,武汉430040

出　　处：《现代隧道技术》2021年第1期203-211,共9页Modern Tunnelling Technology

基　　金：云南省交通运输厅科技创新示范项目(云交科教[2019]15号);中国交通建设集团有限公司科技研发项目(HT-A-2018-006)。

摘　　要：为研究大跨度黄土隧道变形特征及相应的控制技术,指导黄土隧道设计与施工,确保施工安全。文章依托某在建隧道工程,结合大变形段现场监测数据对围岩变形及原因进行分析,并提出相应的控制措施及参数。研究结果表明:浅埋黄土隧道围岩变形受上覆围岩性质影响差异较大,开挖初期围岩变形速率普遍较大,最大沉降速率达到54.6 mm/d;变形持续时间长,约45 d才逐渐趋于收敛;累计变形量大,且受开挖扰动影响显著,特别是下台阶开挖时围岩变形约占总变形量的70%;围岩大变形主要分为"快速发展—持续发展—缓慢发展—趋于稳定"等4个变化阶段,持续发展阶段易受外部环境影响,围岩变形速率波动较大,缓慢发展阶段仰拱尽早闭合成环,可有效抑制围岩变形发展;回归曲线模型可直接用于软弱黄土隧道变形量的预测。In order to study the deformation characteristics and the corresponding control technology of large-span loess tunnels,guide the loess tunnel design&construction and ensure the construction safety,based on a tunnel project being under construction,this paper analyzes the surrounding rock deformations and the causes according to field monitoring data of the large deformation section,as well as proposes corresponding control measures and pa⁃rameters.The study results show that great differences exist in surrounding rock deformations of a shallow loess tun⁃nel affected by the properties of overlying surrounding rocks,the surrounding rock deformation rate is generally large at the early stage of excavation with the maximum settlement rate of 54.6 mm/d;the deformation lasts for a long time and tends to converge gradually after about 45 d;the accumulative deformation is large and significantly affected by excavation disturbance,in particular,the surrounding rock deformation during the lower bench excava⁃tion accounts for about 70%of the total deformations;the large deformation process of surrounding rocks will experi⁃ence four stages of"fast development,sustainable development,slow development and gradual stabilization",in the stage of sustainable development it is susceptible to external environment with a large fluctuation in surrounding rock deformation rate,at the stage of slow development the invert should be closed as soon as possible to effectively restrain the deformation development of surrounding rocks;the regression curve model can be directly used to pre⁃dict the deformation of soft loess tunnels.

关 键 词：黄土隧道 浅埋 大跨度 变形特征 原因分析 控制措施 

分 类 号：U456[建筑科学—桥梁与隧道工程]