昆仑山铁路隧道与拟建公路隧道合理间距研究

发布时间：2019-02-25 17:20

【摘要】：本文针对温度场对2座寒区隧道之间的最小合理间距进行了研究。重点分析了邻近寒区隧道之间的围岩温度场随时间的变化情况，并提出了一种判断相邻寒区隧道间距是否合理的方法。 为了尽量缩小环境破坏的范围，便于参考已建成线路进行勘察、设计、施工，避免浪费额外的人力、物力和财力。必然会出现较多的新建隧道与已建隧道相邻的情况。本文围绕已建成通车的青藏铁路昆仑山铁路隧道展开，并在距离该隧道右边墙的水平位置25m~35m范围内模拟新建一个公路隧道，采用数值模拟、数据对比的方法分析研究了两座邻近寒区隧道之间围岩的温度场分布状况。本文还研究了3个特定位置的围岩温度在不同时间、不同间距和不同工况下的温度变化情况。本文最后还采用ANSYS软件里面的优化模块（/OPT），通过优化设计确定了考虑温度场下两座寒区隧道合理间距的可行域，并最终确定了两座寒区隧道的最小合理间距BHmin。 首先针对两座相邻寒区隧道温度场的影响规律，，结合工程实例，采用数值模拟手段进行瞬态温度分析，采用25m和35m两个极限间距的模型作为典型工况，对比在修建新隧道与不修建新隧道2种情况下，昆仑山铁路隧道附近的围岩温度在不同时期的不同状态，研究得到了对既有隧道附近围岩温度场的影响规律。主要规律为新建隧道施工期间对两条隧道之间围岩温度场的影响远大于新隧道通车后对两条隧道之间围岩温度场的影响。整个温度场在新隧道通车后（第16年）明显开始趋于稳定。 然后使用ANSYS优化模块。优化的目标是当新隧道通车时，对既有隧道原有温度场的干扰能够消除。计算了在同一种施工方案下，新建公路隧道既有昆仑山铁路隧道的影响，给定了优化设计的的约束条件和临界条件，最终找出了的合理间距区间BH，并找出了最小合理间距BHmin。 最优方案满足的主要约束条件为：B∈[25m,35m]。满足的临界条件为：ΔT16max≤0.2℃。当B=BHmin时，距既有隧道15m的D15位置的ΔT16max=0.19426℃＜0.2℃，计算结果正确。 最优方案下，新建隧道通车后，两隧道之间围岩的最高温度变化约在-2.681℃~-2.752℃范围，比第10年同期温度仅下降了1.9%~4.6%。这表明新隧道通车后对两条隧道之间围岩温度场的影响已基本消除。
[Abstract]:In this paper, the minimum reasonable spacing between two tunnels in cold region is studied according to the temperature field. In this paper, the variation of surrounding rock temperature field with time between tunnels in adjacent cold regions is analyzed emphatically, and a method to judge whether the distance between tunnels in adjacent cold regions is reasonable or not is put forward. In order to minimize the scope of environmental damage, it is easy to refer to the built lines for investigation, design, construction, and avoid wasting additional manpower, material and financial resources. There must be more new tunnels adjacent to the existing ones. In this paper, the Kunlun Mountain Railway Tunnel of the Qinghai-Tibet Railway, which has been opened to traffic, is carried out, and a new highway tunnel is simulated within the horizontal position of 25m~35m from the right wall of the tunnel, and the numerical simulation is adopted. The temperature field distribution of surrounding rock between two tunnels in adjacent cold region is analyzed by the method of data comparison. In this paper, the temperature variation of the surrounding rock at different time, spacing and working conditions at three specific locations is also studied. Finally, the optimization module in ANSYS software (/ OPT),) is used to determine the feasible region considering the reasonable spacing between the two tunnels in the cold region under the temperature field, and finally the minimum reasonable spacing of the tunnels in the two cold regions is determined by the optimal design. Firstly, according to the influence law of temperature field in two adjacent cold region tunnels, combined with engineering example, the transient temperature analysis is carried out by means of numerical simulation, and the two limit spacing models of 25m and 35m are adopted as the typical working conditions. Comparing the different conditions of surrounding rock temperature near Kunlun Mountain Railway Tunnel in different periods under the conditions of constructing new tunnel and not constructing new tunnel, the influence rule of surrounding rock temperature field near existing tunnel is studied. The main rule is that the influence of the surrounding rock temperature field between the two tunnels during the construction of the new tunnel is much greater than that of the surrounding rock temperature field between the two tunnels after the opening of the new tunnel. The whole temperature field began to stabilize obviously after the opening of the new tunnel (16 years). Then use ANSYS optimization module. The objective of the optimization is to eliminate the interference to the existing temperature field when the new tunnel is opened to traffic. Under the same construction scheme, the influence of the existing Kunlun Mountain railway tunnel in the new highway tunnel is calculated. The constraint conditions and critical conditions of the optimal design are given. Finally, the reasonable interval BH, and the minimum reasonable spacing BHmin. are found out. The main constraints of the optimal scheme are: B 鈭

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