同家村隧道明挖暗作施工技术研究

发布时间：2018-02-15 11:42

本文关键词： 明挖暗作法数值模拟稳定性控制技术　出处：《石家庄铁道大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着我国经济飞速发展,铁路公路路网逐渐完善。在高速公路、铁路修建过程中,单座隧道同时下穿数座山岭的情况时有发生。受地形条件及隧道平纵剖面设计等因素影响,隧道通过山谷处时,常出现超浅埋和偏压的情况。并且两山的山谷处往往风化侵蚀严重、断层破碎带发育、雨季汇水集中,一般多系风化破碎岩层,或堆积层、冲积层、坡积层等比较松软的地层。因此,在确保安全、高效、低投入的前提下,采用怎样的施工方案是山谷段隧道施工经常面临的问题。文以娄邵铁路扩能改造工程中的同家村隧道为工程背景,提出了明挖暗作法通过山谷地段,并进行了几下几方面科研工作:(1)根据推测的监控量测结果,通过BMP2000参数反演和有限元参数正演得出同家村隧道明挖暗作段围岩参数。(2)根据前面对明挖暗作法工序详细的介绍,作者先对明挖参数进行优化,包括护拱的高度、验证了边坡的稳定性、回填时机,又针对暗洞开挖时台阶长度、台阶高度、循环进尺等明挖暗作法的关键技术,进行数值模拟,从洞周位移、围岩塑性区分布、掌子面挤出变形和结构内力几个方面比较分析结合实际施工情况综合确定最适合的施工方法。(3)根据明挖暗作法整个施工过程以及施工工法优化的结论,确定了出关于护拱的施作、明暗交界的处理、护拱结构的稳定和中下台阶围岩的稳定等施工过程中的关键技术参数,这几项关键技术对同家村隧道工程明挖暗作段的成败起到了决定性作用。(4)根据明挖暗作段监控量测结果结合工程实际施工情况,对同家村隧道明挖暗作法施工效果进行评价。
[Abstract]:With the rapid development of economy in our country, the railway highway network is gradually consummated. In the process of highway and railway construction, the situation of single tunnel passing through several mountains at the same time occurs from time to time, which is influenced by the terrain condition and the design of tunnel horizontal and longitudinal profile. When the tunnel passes through the valley, it often appears the situation of super shallow burying and bias. And the valley of the two mountains is often weathered and eroded seriously, the fault fracture zone is developed, the catchment of water is concentrated in the rainy season, and there are generally many systems of weathered broken rock, or accumulation, alluvium, etc. Sloping layers and other relatively soft formations. Therefore, under the premise of ensuring safety, efficiency and low investment, What kind of construction scheme is often faced by tunnel construction in valley section. Taking Tongjiacun Tunnel in Loushao Railway capacity expansion Project as the engineering background, this paper puts forward the method of open digging and dark digging through the valley section. Several aspects of scientific research work are also carried out. (1) according to the results of the speculated monitoring measurements, the parameters of surrounding rock of the open excavation and dark section of Tongjiacun Tunnel are derived by the inversion of BMP2000 parameters and the parameters of the finite element method.) according to the detailed introduction of the procedure of open excavation and dark excavation, The author first optimizes the open excavation parameters, including the height of the arch, verifies the stability of the slope, the timing of backfill, and carries out numerical simulation aiming at the key techniques of the dark excavation, such as the length of the step, the height of the step, the circular ruler, and so on. From the displacement around the hole, the distribution of the plastic zone of surrounding rock, Comparative analysis of extrusion deformation and structural internal force of palm face combined with actual construction conditions, the most suitable construction method is determined synthetically. (3) according to the conclusion of the whole construction process of open excavation and the optimization of construction method, The key technical parameters in the construction process, such as the construction of arch protection, the treatment of light and dark junction, the stability of arch structure and the stability of surrounding rock of middle and lower steps, are determined. These key technologies play a decisive role in the success or failure of the open excavation and dark work section of Tongjiacun tunnel project. According to the monitoring and measurement results of the open excavation and hidden work section, combined with the actual construction situation of the project, the construction effect of the open excavation and dark excavation method in Tongjiacun tunnel is evaluated.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.4

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