摘要
针对大王顶隧道围岩较软弱破碎、埋深较浅、施工步骤多、难度大、处理不当极易坍塌的问题,为确保该工程能在不良地质条件下顺利安全施工,选择隧道左线出口段的K43+842为典型断面,运用FLAC建立数值分析模型,分析和比较了全断面法、上下台阶法、三台阶法、双侧壁导坑法对隧道Ⅴ级软弱破碎围岩段的围岩位移、塑性区大小和分布的影响程度。结果表明,双侧壁导坑法对围岩位移的整体控制效果最好,且施工质量最好,最适合于大王顶隧道Ⅴ级浅埋围岩段的施工。
The surrounding rock of Dawangding tunnel has characteristics of soft and fragment, shallow buried depth, many difficult construction steps and easy collapse. In order to ensure a successful and safe construction in the bad geological conditions, choosing the K43＋842 near the left exit of the runnel as the typical fault surface, FLAC is used to build the numerical simulation model. And then the effcct on the surrounding rock displacement and the plastic zone size of four construction methods including full section method, top and bottom shoulder method, three shoulder method, double pilot tunnel method are analyzed and compared. The results show that the total control effect on surrounding rock displacement and the construction quality with double pilot tunnel method is the best and this method is fit for the construction of Dawangding tunnel in the V-level surrounding rock shallow-buried section.
出处
《水电能源科学》
北大核心
2011年第7期84-88,共5页
Water Resources and Power
基金
广东省交通厅科技基金资助项目(2009-02-015)
关键词
软质破碎围岩
隧道
施工方法
数值模拟
比选
soft and fragmented surrounding rock
tunnel
construction method
numerical simulation
optimization
