基于岩土控制变形工法的公路隧道施工变形分析——以野猪山隧道为例  

Analysis of Deformation of Yezhushan Highway Tunnel Construction Based on Analysis of Controlled Deformation in Rocks and Soils(ADECO-RS)

作　　者：谈识 丁文其[1,2] 刘诚[1,2] 刘挺[3] 郭洪雨 

机构地区：[1]同济大学土木工程学院地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]宁波市高等级公路建设指挥部,浙江宁波315192 [4]浙江省交通规划设计研究院,浙江杭州310006

出　　处：《隧道建设》2017年第5期593-599,共7页Tunnel Construction

基　　金：基于软弱围岩变形控制工法的公路隧道安全施工关键技术研究项目(201611);国家自然科学基金项目(51578408);复杂环境下浅埋大断面互通隧道关键技术研究项目(20133139)

摘　　要：宁波野猪山公路隧道右线出口段埋深浅、围岩差,采用岩土控制变形工法施工。该工法在我国公路隧道施工中几乎未有使用。本文通过数值模拟和现场监测数据对比分析,得出:1)隧道地表沉降的开挖空间效应约为0.6倍跨径,并据敏感程度划分为沉降敏感区、敏感过渡区、稳定区3个区域;2)隧道拱顶沉降约60%发生在掌子面到达监测断面前,开挖空间效应稍大于单倍跨径;3)隧道掌子面挤出变形呈外凸抛物面形态,建议施工中纤维锚杆的搭接长度设为6 m,并据挤出变形发展速率划分为快速发展、稳定发展、基本稳定3个阶段。ADECO-RS （analysis of controlled deformation in rocks and soils） method is used in Ningbo Yezhushan Highway Tunnel with shallow buried depth and weak surrounding rock. The above-mentioned method is hardly used in highway tunnel construction in China. Based on the analysis of numerical simulation and field monitoring, some results are obtained as follows ： 1 ） As for surface subsidence of Yezhushan Tunnel, the spatial effect of excavation is 0.6 times the span and the settlement area can be divided into 3 parts, namely, sensitive area, sensitive transition area, and stable area. 2 ） The spatial effect of excavation on tunnel crown top settlement is almost a span and 60% of crown top settlement occurs before tunnel face reaches monitoring section. 3 ） Three-dimensional morphology of Yezhushan Tunnel face extrusion is outer convex parabolic; lap length of fiberglass bolt is suggested to be 6 m and the development of extrusion deformation is segmented into three stages.

关 键 词：公路隧道 岩土控制变形工法 施工变形 超前核心土 玻璃纤维锚杆 数值模拟 监测分析 

分 类 号：U459.2[建筑科学—桥梁与隧道工程]