| With the development of expressway and railway construction, the underground engineering construction is developing to be longer and buried deeper than usual. In the past years, large numbers of buried deeply and long tunnel which passed through the foul engineering geology environment had been emerged unceasingly. Therefore, panying more attention on the analysis of tunnel space stability and its control engineering research is rather important to the construction and operation of the highway and railroad.First, the formation and judge method of unsymmetrical pressure tunnel are summarized, and then the wall rock pressure calculation and contrary calculation of geology and topography unsymmetrical tunnel are analyzed.Taking the example of Gonghe tunnel from Pengshui to Wulong of Xiangyu expressway the finite element software 2D-sigma are used to analyze the distribution rule of quadric stress and the wall rock transformation condition of unsymmetrical tunnel after excavation, then compare to the field measurement dates that includes horizontal constringency, arch roof subsidence, wall rock pressure, steel backstop stressstrain, and axial force of anchor bolt and so on. The evaluated results agree well with the practical records.Finally, after studying the stressstrain distribution law and wall rock transformation of unsymmetrical tunnel and simulating the support form of GongHe tunnel with the 2D-sigma numerical analysis, we can suggest construction projects and support ways which are reasonable in scientific and feasible in economic.
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