强风化砂岩地区浅埋偏压隧道病害分析及整治.pdfVIP

第59卷 第4期 铁 道 标 准 设 计 Vol.59 No.4 2015年4月 RAILWAY STANDARD DESIGN Apr. 2015 文章编号:1004 2954(2015)04 0079 05 强风化砂岩地区浅埋偏压隧道病害分析及整治 周运祥 (中国铁路总公司工程管理中心,北京 100038) 摘 要:浅埋偏压隧道在铁路建设中较为常见,偏压荷载是形成隧道病害隐患的根本原因。 为解决强风化砂岩地 区浅埋偏压对隧道结构稳定造成的不利影响,以某隧道为研究背景,通过现场观察和分析监测结果,探讨隧道受力 机理,归纳总结出地形因素是偏压荷载产生的根本原因,施工干扰及水的因素恶化了隧道不平衡的条件。 隧道成 功的施工,验证了反压回填能够平衡隧道承受的偏压荷载、注浆加固能够提高破碎围岩的整体稳定性,双侧壁导坑 法对施工干扰少,在开挖中应优先选用。 关键词:铁路隧道;强风化; 砂岩;浅埋; 偏压; 病害; 整治 + 中图分类号:U457 .2 文献标识码:B DOl:10.13238/ j.issn.1004-2954.2015.04.020 Analysis and Improvement of Bias Shallow Tunnel in Heavily Weathered Sandstone Area ZHOU Yun-xiang (Engineering Management Center of China Railway Corporation,Beijing 100038,China) Abstract:The bias shallow tunnel is very common in railway construction. The bias load is the root cause of potential tunnel defects. Thispaper addressestunnel stressmechanism andtheroot cause of the biasload based on site observation and analysis of monitoring data collected from a tunnel as to mitigate the adverse effects onthestability oftunnel structureinheavilyweatheredsandstonearea. Itisgeological conditions that generate bias load, and the construction activities and water that deteriorate tunnel unbalanced conditions. The success of tunnel construction verifies that the back pressure backfill can balance the tunnel under bias load,grouting reinforcement can improve the overall stability of broken surrounding rock, and the double side heading method has less interference on the construction and