双碑隧道涌水量预测及运营预警措施研究

发布时间：2018-03-26 15:39

本文选题：岩体渗流　切入点：涌水量预测　出处：《西南交通大学》2015年硕士论文

【摘要】：随着西南地区交通基础设施的建设,隧道工程的规模越来越大,在隧道修建过程中,所遇到地质条件复杂,涌突水、突泥、软岩大变形、岩爆等灾害时有发生,其中突涌水灾害所造成的人员伤亡和经济损失在各类隧道地质灾害中居于前列,不仅导致重大人员伤亡或严重工期延误,也对地表及隧址区水资源和环境造成了不可修复的污染和生态破坏。并且在隧道运营阶段,由于岩溶地区地下水与降雨联系密切,造成隧道运营阶段出现涌水,进而对行车安全造成危害。本文以重庆双碑隧道为例,对隧道施工和运营期涌水量进行了预测,并提出了预警措施。主要研究内容及成果如下：(1)根据隧址区地质条件和水文条件对隧道涌水量因素进行评价,初步判断了出现涌水的大小与位置。基于岩体渗流理论,提出了适用中梁山观音峡地区的地下水流模型,即考虑裂隙存在的等效介质模型。(2)划分了隧道各区段的地下水动力带,并依据理论公式的适用范围对各区段进行了理论公式的选择和结果预测,经与实际监测数据进行了对比,确定了各区段的正常涌水量和最大涌水量适用公式。(3)通过有限差分软件Visual MODFLOW建立了该地区的水文地质概念模型,预测了施工过程中各区段的平均涌水量,证明了该软件在隧址区的适用性,并研究了施工阶段隧址区的渗流场变化。(4)预测了隧道运营阶段枯水期和降雨期的隧道涌水量,针对运营隧道涌水病害提出了预警措施。
[Abstract]:With the construction of traffic infrastructure in southwest China, the scale of tunnel engineering is becoming larger and larger. In the process of tunnel construction, the geological conditions are complicated, such as water gushing, mud outburst, large deformation of soft rock, rock burst and so on. Among them, the casualties and economic losses caused by the sudden flooding of water are in the forefront of all kinds of tunnel geological disasters, which not only lead to heavy casualties or serious delays in the construction period, It also causes irreparable pollution and ecological damage to the water resources and environment in the surface and tunnel area. In the tunnel operation stage, the groundwater in karst area is closely related to rainfall, resulting in water gushing in tunnel operation stage. Taking Chongqing Shuangbei Tunnel as an example, the water inflow during the construction and operation of the tunnel is forecasted. The main research contents and results are as follows: 1) based on the geological and hydrological conditions of tunnel area, the factors of tunnel water inflow are evaluated, and the magnitude and position of water gushing are preliminarily judged, based on the seepage theory of rock mass. A model of groundwater flow in Guanyin Gorge area of Zhongliangshan, I. e., equivalent medium model considering the existence of fissures, is proposed. The groundwater dynamic zones of each section of the tunnel are divided. According to the scope of application of the theoretical formula, the selection of the theoretical formula and the prediction of the results of each section are carried out, and the results are compared with the actual monitoring data. The suitable formula for normal and maximum discharge of each section is determined. The hydrogeological conceptual model of this area is established by using finite difference software Visual MODFLOW, and the average water inflow of each section during construction is predicted. The applicability of the software in tunnel area is proved, and the variation of seepage field in tunnel site area in construction stage is studied. (4) the tunnel water inflow during dry and rainfall periods is forecasted, and the early warning measures are put forward for the water gushing disease of operating tunnel.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U456.32

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