城市轨道交通富水岩溶隧道衬砌外水压力及结构受力研究
[Abstract]:With the development of rail transit in our country, it is inevitable to pass through the high water pressure and water rich ground layer when selecting the tunnel route. In the past, the problem of high water pressure and water rich ground layer is often adopted by the principle of "drainage as the main factor", and the water load is less considered. However, the ecological environment and engineering will cause a lot of adverse effects. In order to protect the ecological environment and ensure the durability and safety of engineering, this paper takes "active water plugging, limited discharge" as the concept of tunnel design, considering the influence of water load on tunnel structure and stability. In this paper, with the support of Chongqing Natural Science Foundation and the first long mountain tunnel in the field of railway transportation in Chongqing, which is Zhongliangshan Tunnel on Line 1, theoretical analysis and field test are adopted. By numerical simulation and other methods, the external water pressure and structural stress characteristics of the lining of water-rich karst tunnel are studied systematically and deeply. The following main results are obtained: 1 through the investigation of engineering hydrogeological data, The influence of water on the stability of surrounding rock and lining structure of tunnel is analyzed. It is found that the influence of water on the stability of surrounding rock is mainly manifested by the decrease of cohesion, angle of internal friction and effective stress of surrounding rock. The influence of water on the stability of lining mainly shows that the movement of water in the micro-crack of concrete lining produces splitting force and the corrosion of steel bar by karst water. 2. Through the construction of Zhongliangshan Tunnel, the force on the lining structure and the lining are carried out. Field measurement test of external water pressure, The variation of stress on lining structure with time and the variation of external water pressure of tunnel lining under different failure section length of drainage hole are obtained. 3 on the basis of field test and numerical simulation, the unobstructed drainage system behind lining is analyzed. On the tunnel surrounding rock, The influence of seepage field distribution of reinforced ring and lining on the water pressure of grouting ring, primary support and secondary lining is obtained with the increase of drainage failure length. The tunnel excavation process is simulated by FLAC3D, and the distribution law and stress characteristics of surrounding rock, reinforcement ring and lining structure during tunnel excavation are obtained. 4. Through analyzing the thickness and permeability coefficient of different grouting reinforcement ring, the tunnel reinforcement ring is obtained. With the influence of seepage field, stress field, displacement field and stability of primary support and secondary lining, the seepage field and stress field of tunnel reinforcement ring, initial support and secondary lining are obtained with the change of the thickness and permeability coefficient of reinforcement ring. The distribution law of displacement field, variation characteristic and variation law of secondary lining stability are put forward. A reasonable design parameter of grouting reinforcement ring is proposed to solve the problem of (non-stable) seepage field formed after tunnel excavation. Based on Bernoulli equation and Darcy's law, the relationship between permeability coefficient and water pressure under unsteady seepage is derived, and the credibility of numerical simulation results is verified qualitatively.
【学位授予单位】:重庆大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:U451
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