淺埋大斷面軟弱圍巖隧道進(jìn)洞技術(shù)研究
[Abstract]:With the rapid development of social economy in our country, the construction of expressway is more and more, especially in the western mountainous area, the terrain and geological conditions are complex, and the tunnel construction is difficult. The entrance section has always been regarded as the throat of the tunnel, which has the characteristics of shallow buried depth and serious weathered and broken surrounding rock compared with other sections. In addition, the excavation section of expressway tunnel is large, and it is easy to cause the collapse of tunnel entrance, large deformation and other engineering accidents in the process of tunnel entrance construction. Therefore, it is very important to study the tunnel entry technology of shallow buried large section weak surrounding rock tunnel. In this paper, based on a new two-way six-lane tunnel, the tunnel entry technology is studied by means of theoretical analysis, numerical simulation and field monitoring. The main research contents are as follows: (1) according to the existing research results at home and abroad, the characteristics of shallow buried large section weak surrounding rock and the influencing factors of deformation are summarized, and the advanced support of tunnel entry technology is also summarized. The tunnel excavation method and support method are summarized and analyzed. (2) taking the tunnel entrance section as the research object, the ring excavation core soil method, CD method and CRD method are established by finite element method. The effects of four different construction methods on the deformation of surrounding rock, the stress of surrounding rock and the stress of initial supporting structure in the excavation process of different construction methods are analyzed by combining the excavation model of advance pipe shed support with four different construction methods. The numerical simulation results show that the surface subsidence is caused by the bilateral wall pit guide method, and the maximum values of tunnel arch roof subsidence and peripheral convergence are 9.02 mm, 22.77 mm and 13.51 mm, respectively, which are smaller than those of other construction methods and do not exceed the allowable values of the code. At the same time, the stress of supporting structure in the initial stage of surrounding rock stress is lower than that of other construction methods. Therefore, the double side wall pit guide method combined with pipe shed advance support is used as the tunnel entry scheme. (3) the three dimensional numerical simulation is carried out by using the hole entry scheme suggested in this paper, and combined with YK159 360 of the entrance section of the tunnel, The results of arch roof subsidence, peripheral convergence and surface subsidence measured by YK159 370 section are compared. the results show that there is a certain error between the measured value and the simulated value, but the deformation law of surrounding rock is basically the same. It is verified that the proposed tunnel entry scheme is feasible.
【學(xué)位授予單位】:西安工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:U455.4
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