摘要
针对怀邵衡铁路岩鹰鞍隧道段F4断层带涌水涌砂的施工难题,运用FLAC"进行数值模拟,根据实际地质情况确定断层带的隧道围岩力学参数,结合现场设计方案建立以岩鹰鞍隧道正洞,排水支洞以及迂回导洞在内的三维计算模型,确立了只进行正洞开挖和先修建排水支洞和迂回导洞再进行正洞开挖两种不同的计算工况。计算结果发现在开挖排水支洞和迂回导洞并降水之后再进行正洞开挖可以明显减小正洞开挖时围岩的塑形变形,有利于正洞的围岩稳定。结果表明,先修建排水支洞和迂回导洞的方案是切实可行的,能够保障施工安全、确保工期。
In view of the construction problem of water and sand gushing in F4 fault zone of Yanying1 an Tunnel of Huaihua- Hengyang Railway, numerical simulation was carried out by FLAC", and the mechanical parameters of tunnel surrounding rock in fault zone were determined according to the actual geological conditions. Based on the site design scheme, a threedimensional calculation model was established, which contained the main tunnel, drainage branch tunnel and circuitous pilot tunnel, and two different calculation conditions were established, including excavation of main tunnel only, construction of drainage branch tunnel and circuitous pilot tunnel before excavating main tunnel. It was found that the plastic deformation of surrounding rock during the excavation of the main tunnel could be reduced obviously after precipitation and constructing the drainage branch tunnel and the circuitous pilot tunnel in advance, which was conducive to the surrounding rock stability of the main tunnel. The results showed that the scheme of first building drainage branch tunnel and circuitous pilot tunnel was feasible, which could ensure the construction safety and the duration of the project.
作者
吴应明
任少强
Wu Yingming;Ren Shaoqiang(China Railway 20^th Bureau Group Co. Ltd. , Xi'an Shaanxi 710016, China)
出处
《铁道建筑技术》
2019年第3期95-99,共5页
Railway Construction Technology
基金
湖南省科技厅2017年度省重点研发计划项目(2017SK2393)资助
关键词
大涌水
排水洞
迂回导洞
正洞开挖
施工顺序
数值计算
water gushing
drainage tunnel
circuitous pilot tunnel
excavation of main tunnel
construction sequence
numerical calculation
