Bearing Capacity Analysis And Design Optimization Of The Multi-arch Tunnel Lining

For different surrounding rock, different depths and different span, different construction methods, different types of double-arch tunnel lining parameters of the selected differences, the paper lining of the tunnel in the domestic and foreign research methods and research results on the basis of the arch tunnel Construction of key technologies for the background, and to address the arch tunnel construction process of lining parameter optimization as the starting point. Through the deep and shallow arch tunnel both cases, III, IV, V rock category three status, recorded a total of six kinds of conditions for carrying capacity analysis and numerical simulation. Application of bearing capacity of structure and ANSYS finite element method to study a variety of typical double-arch tunnel model, the arch tunnel primary support and secondary lining carrying capacity calculation and analysis, as well as changes in the lining of the component parameters Under the arch tunnel effect.First, A Primary Study on the arch of the lining of the tunnel structure of the various factors and establishment of six kinds of typical double-arch tunnel model. Based on the actual arch tunnel force in the establishment of deep and shallow arch tunnel loading model.And then by the bearing capacity of law can be drawn various depths, under different rock bolt system, sprayed concrete, steel and secondary lining bearing capacity of the structure, further analysis of the various components of the lining of the state and Changes in laws and specific terms to six kinds of typical model of the tunnel lining carrying capacity, the parameters recommended for norms have been adjusted.Followed by ANSYS simulation software supporting different parameters under the conditions of rock and supporting structure of the stress, displacement, quantitative analysis of a change in the respective parameters for a possible nature of the norms on the recommendation of the lining of support parameters Optimized.Finally, the arch tunnel ANSYS secondary lining of the field analysis, from the most disadvantaged sections M, N, Q value and then establish a project cost as the objective function, the penalty function (SUMT) to solve the optimal model of Second lining to optimize the thickness.