高铁隧道底部大型溶洞先通过后处治技术研究  

Study on Treatment-after-passing Technology for Large Karst Cave below High-speed Railway Tunnel

作　　者：陈文尹 CHEN Wenyin(China Railway 4th Bureau Group Co.,Ltd.,Hefei 230023)

机构地区：[1]中铁四局集团有限公司,合肥230023

出　　处：《现代隧道技术》2022年第4期248-255,共8页Modern Tunnelling Technology

摘　　要：在岩溶发育区进行高铁隧道开挖施工时,底部大型溶洞对隧道的施工影响不可忽视。针对南崇铁路汪庄隧道施工中遇到的底部大型溶洞工程难题,采用数值模拟和模型试验分析的方法,基于灰岩自身承载力高的特点,提出了“先通过,后处治”施工技术应对底部溶洞:上台阶施工后增设锁脚锚杆及拱部锚索,上吊下撑支护结构后,掌子面向前继续掘进,采用洞渣快速回填底部溶洞,待施工作业区域与溶洞处理区域互不干扰时,下台阶逐段揭开隧底溶洞顶板,再对溶洞进行永久性处理;底部大型溶洞的处治采用筏板和桩基形成“桩板结构”,减少溶洞对隧道运营期的影响。该溶洞隧道施工技术有效减少了溶洞处治对施工进度的影响,施工安全、施工质量也可得到有效保障,可为类似工程提供有益的参考。When the high-speed railway tunnel is excavated in the karst development area, the influence of large karst cave below on tunnel construction cannot be ignored. In view of construction difficulty in bottom large karst cave encountered in Wangzhuang Tunnel of Nanning-Chongzuo Railway, the "treatment-after-passing" construction technology was proposed to deal with the karst cave below by using the methods of numerical simulation and model test analysis on the basis of high bearing capacity characteristics of limestone, as shown below. The foot-locking bolts and arch anchor cables will be added after completion of upper bench, and the lower support structure will be lifted. The tunnelling process will continue, and the muck will be quickly used to backfill the karst cave below.When there is no interference between the construction area and the karst cave treament area the karst cave roof will be exposed in the lower bench and the permanent treatment will be conducted for the karst cave. Raft and pile foundation is adopted to treat the large karst cave below to form a "pile-slab structure" to reduce the impact of the karst cave on the tunnel operation. This karst tunnel construction technology effectively reduces the impact of karst tunnel treatment on construction progress and ensures construction safety and quality. So, it provides a useful reference for similar projects.

关 键 词：隧底溶洞 高铁隧道 先通过后治理 桩板结构 

分 类 号：U457.5[建筑科学—桥梁与隧道工程]