Large Span Tunnel Monitoring Measurement And Dynamic Feedback Technique To Construction

With a great deal of long-span tunnels springing up, the different project conditions mechanical action and the stability of tunnel round rock mass are being studided on the basis of the experiments for the past engineering. And the information construction technology of tunnel plays a more and more important role.With successful application of information construction and its good guidance on construction, the application of tunnel monitor and the information construction technology in the construction of Meiguan long-span tunnel of Shaogan highway are studied in this disseration. By using the random fuzzy theory and modern numerical analysis methods, the monitor data of the tunnel were optimized. And the back-analyzed rock mechanical parameters aimed at the optimization design and effective construction. A dynamic feedback of the tunnel construction techniques, which from theory to practice and then to the theory, was ultimately sek.The main contents of this dissertation include follows:(1) To different forms of single tunnel, the distribution of stress and displacement are analyzed.(2) Particularly discussed the theory of information construction technology, analyzed the effect of monitoring survey in information construction technology and the information from tunnel construct spot.(3) With the adoption of the elastic-plastic model, this paper uses the method of nonlinear displacement back-analysis to analyze the surrounding rocks' parameter, and chooses the sensitive parameters to speed up the calculation;(4) Considering the incertitude property of tunnel rock mass, the random-fuzzy method is used to deal with the monitor data which will be fitted for FLAC results. A conclusion can be obtained that the combination method of the random-fuzzy method and FLAC numerical simulation could easily forecast the internal force and displacement of each note of tunnel section, so the method is practicable.(5) Analyzed the stress and displacement field caused by the later-stage tunnel construction by introducing the method of normal computation for back-analysis. And discussed the influence of the supporting time and supporting stiffness, displacement and stability of all parts of the tunnel.