基于地表沉降控制标准的隧道施工安全评估  

Safety Assessment of Tunneling Based on Surface Settlement Standard

作　　者：张平良 方信贤 张运良[2] 安永林[2] 

机构地区：[1]浙江华恒交通监理咨询有限公司,浙江绍兴312000 [2]中南大学,长沙410075

出　　处：《铁道工程学报》2010年第5期48-53,共6页Journal of Railway Engineering Society

基　　金：湖南省研究生创新基金项目(3340-74236000004);铁道部课题(2005K002-D-3)

摘　　要：研究目的:为评价浏阳河隧道施工下地表沉降的安全性,本文从围岩稳定、经验公式和相关规范角度探讨地表变形控制标准,进而建立三台阶工法和双侧壁导坑工法下的三维仿真模型,并同现场监测做对比分析。研究结论:浅埋隧道比深埋隧道的地表沉降控制标准更严格;围岩越坚硬,跨度、边墙高度越小,则允许的地表沉降越小,反之则越大;允许的沉降控制标准主要影响因素是围岩自身条件,其次是隧道的跨度;三台阶法和双侧导坑均能满足地表沉降安全性,考虑到工期的要求采用了三台阶法施工;现场监测结果比数值模拟的要小。Research purposes： In order to assess the safety of surface settlement during construction of Liuyang River Tunnel,in this paper,the surface settlement standard was discussed from the views of rock stability,empirical formula and relative norms.The three-dimensional model was established by GTS to simulate construction using three bench method and two side-wall pilot method.The comparison of numerical simulation results with the in-site monitoring results was made as well.Research conclusions：The standard of surface settlement for shallow tunnel is stricter than deep buried tunnel.The harder the rock is,the smaller the tunnel span is,the lower the side wall is and the smaller the allowable surface settlement is.Otherwise they are bigger and higher.The main influence factor is rock＇s property,and the secondary influence factor is tunnel span.Both three-bench method and two-side-wall pilot method can meet the requirements of the settlement safety.Considering the construction schedule,three-bench method is adopted.The data values of in-site monitoring are smaller than numerical simulation.

关 键 词：隧道工程 沉降控制标准 施工安全评估 

分 类 号：U455[建筑科学—桥梁与隧道工程]