Lining Variation Analysis Of Hallow-Buried And Unsymmetrical Pressure Tunnel

Shallow-buried and unsymmetrical pressure tunnels often occurs the diseases of variation in tunnel lining in the course of running, due to the design, construction, as well as support measures misconduct, while the current treatment methods that regulates the defects of shallow-buried and unsymmetrical pressure tunnels lining are not according to the root causes. So this paper analyses the influence condition of the defects of shallow-buried and unsymmetrical pressure tunnels lining, in order to guide the treatment of tunnel defects.This paper studies and analyses the influence condition of the defects of the unsymmetrical pressure tunnels lining in the stable relief. The finite element soft is used to simulate computing and analyses the each influential factors of the unsymmetrical pressure tunnels lining in the stable relief. And the orthogonal method is used for analyse the test data.In this thesis, orthogonal design theory is used for experimental designing and data processing analysis, and the ANSYS software is used for the finite element computation and analyse each experimental model. The finite element computations include the planar model computation and three-dimensional model computation. Thereinto, the planar model computation analyses topographical condition, surrounding rock condition and secondary lining condition of shallow-buried and unsymmetrical pressure tunnel, in order to ascertain their primary and secondary relations for lining variation's influence; three-dimensional model computation mainly analyse the lining cracks situation, influencing situation of each factors and the relationship between the lining displacement and the surrounding rock pressure.By this analysis of this paper, the conclusions are found as follow:1) The orthogonal design method can reduce workload effectively. Moreover, the result of this analysis of experiments can represent the result of comprehensive test analysis.2) The planar model computation for topographical condition studies mostly two influencing factors: topographic slope and minimum buried depth of the tunnel. Through analyzing, it is found that the two factors have great influence on the unsymmetrical pressure on tunnel. Above all things the two factors have great influence on the unsymmetrical pressure on tunnel, when the topographic slope is more than 1:1.5 and the minimum buried depth is small than 15m, and it need to be considered that stability of the side rock and soil bodies. While the unsymmetrical pressure on tunnel is less affected when the minimum buried depth is larger than 30m.3)According to the analyses of the wall rock, the paper mostly analyses the density, the deformation modulus, the poison ratio, the angle of internal friction and the cohesion of wall rock. The deformation modulus most affects the displacement and stress of the liner. So some effective methods should be taken to control the deformation modulus during the regulating the defects of shallow-buried and unsymmetrical pressure tunnels lining.4) According to the regression analysis of the data, it found that there is the functional relationship between the lining displacement and surrounding rock pressure;...