Study On The Key Technology For Design And Construction Of Underground Cavern With Large Span And High Sidewall

With China's rapid economic development, more and more projects enter the planning and implementation stages. Especially in the national defense projects, the underground works with high walls and large spans are common. Although most projects are built in the surrounding rock of higher levels, but for the defense works on the underground, there is no uniform method of rock classification. There does not have a mature construction method for the special requirements of national defense underground engineering in China.By studying the surrounding rock classification method, the basic deformation of underground caverns and support parameters, information construction in the monitoring methodology and information feedback, the paper reached the following conclusions and results:(1) This paper is to study the rock underground works on the defense Classification. Article summarizes the current domestic and foreign popular rock classification methods, and statistical classification methods for rock classification of common indicators. This paper selects a representative number of indicators, both qualitative and quantitative, which are proposed a project for underground rock in defense Classification. There is a specific large high wall underground cavern as an example to verify the usefulness of this method. Article uses the on-site monitoring of the surrounding rock displacement and bolt axial force data to study the feasibility of the design and construction program.(2) In this paper, MIDAS/GTS calculation software is used to simulate the concrete construction program, to verify the rock deformation and Anchors. Through on-site monitoring data and actual monitoring data analysis, design and construction program is feasible, and the problems in the construction are given suggestions for improvement.(3) In this paper, GA-ANFIS is used to predict the displacement of underground rock engineering, and compare with the actual monitoring of the surrounding rock displacement. By comparison, the projected results are consistent well with actual results, the error is relatively low. This also proves that GA-ANFIS working in the field of national defense ground have a good fitness.