| With the development of modern transportation tunnel, tunnel crossing phenomenon began to appear more and more, the construction difficulty also increases gradually, especially in complex geological conditions, two adjacent tunnel cross section, support design tends to be conservative,while the waste, the construction quality and safety risk increases, how to reduce the complicated geological conditions fast railway near the cross section of tunnel construction difficulty, reduce the construction cost, the quantitative determination of influencing factors on the stability of surrounding rock of cross tunnel. It is the focus of the work of railway to study and resolve in cross section of tunnel in construction.This research is supported by the new railway where the CaoMeigou2# tunnel cross under PanDaoling tunnel betwteen Qianyang to Zhuanghe DT2, through the application of Hoek-Brown strength criterion, Mohr-Coulomb criterion,subgrade settlement control standard calculation theory, through theoretical derivation, get on a plastic solution and the corresponding analytical range through the small spacing tunnel effect next, by computing the confining pressure deformation and stress strain, a comprehensive evaluation on the stability of the confining pressure of cross tunnel. By theoretical study,laboratory test, numerical simulation, field monitoring and comprehensive research method, carries out the research on three stages, starting with the engineering geological exploration information and field conditions, through the comparison of schemes preliminary monitoring program and determine the simulation parameters, and then calculate the tunnel surrounding rock tunnel support and no support under the condition of deformation. For the adjacent tunnel intersection confining pressure stability study to broaden the thinking, provide a useful reference for future similar engineering application. |
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