_FONT+face%3DVerdana_复杂地质条件下隧道浅埋段全空间综合超前地质预报技术_FONT_.pdfVIP

第 28 卷 增 2 岩石力学与工程学报 Vol.28 Supp.2 2009 年 9 月 Chinese Journal of Rock Mechanics and Engineering Sept. ，2009 复杂地质条件下隧道浅埋段全空间综合 超前地质预报技术 雷明锋，彭立敏，施成华 ( 中南大学 土木建筑学院，湖南 长沙 410075) 摘要：以衡炎高速公路上的官冲隧道为工程背景，采用地表空间微分探测和掌子面 TSP203 系统探测相结合的技 术手段，构建针对复杂地质条件下隧道浅埋段全空间综合超前地质预报方案，并进行实例验证和工程应用。预报 结果认为：该地段隧道所穿越地层主要为全风化～强风化板岩，岩体破碎，富含地下水，存在潜在的滑移面，且 隧道拱肩至拱顶范围已伸入碎石土层内，极不利于隧道的安全施工，建议采取长为 40 m 的 108 mm 大管棚进行 预支护。经掌子面揭示，预报结果与实际开挖揭示情况吻合较好，达到预期效果，说明提出的全空间综合超前地 质预报方案是有效的。 关键词：隧道工程；浅埋段；全空间综合超前地质预报技术；地表空间微分探测；TSP203 系统 中图分类号：U 45 文献标识码：A 文章编号：1000 –6915(2009)增 2 –3571 –06 WHOLE SPACE COMPREHENSIVE ADVANCED GEOLOGICAL PREDICTION TECHNIQUE FOR SHALLOW-BURIED SECTION OF TUNNEL UNDER COMPLICATED GEOLOGICAL CONDITION LEI Mingfeng，PENG Limin ，SHI Chenghua (School of Civil Engineering and Architecture，Central South University，Changsha，Hunan 410075 ，China) Abstract ：Taking Guanchong tunnel on Hengyang Yanling expressway as engineering background，a whole space comprehensive advanced geological prediction scheme for shallow-buried section of tunnel under complicated geological condition is established by technical means of surface spatial differential detection combined with tunnel face TSP203 system. Then it is tested and applied in this project as an example. The prediction result shows that the formations along tunnel are mainly fully weathered to strong weathered slate with rock broken zones ， abundant groundwater and potential slip surface. Even more，the range between spandrel and vault stretches into the gravel clays. All of these are unsafe for tunnel construction and suggests