| With the continuous development of urban expansion, a growing number of urban highway traffic tunnel. But, most of these tunnels are facing difficulties such as large-span, shallow-depth, complex of geological conditions, higher requirement of construction. Based on the Dongshan-tunnel of the Shannan new area in Huainan city to the carrier of study, to the scene measured data as the basis, set up a method about the tunnel back analysis of displacement and surrounding rock stability analysis, it is applied to actual projects similar to the design, construction, monitoring is of important guiding significance.This paper content and research results are:1. Basis on collecting the tunnel detailed information, formulate reasonable control monitoring program. Monitoring of data processing, forecast the surrounding rock deformation trend, analysis the relationship of the surrounding rock deformation and rock excavation and the time, analysis deformation characteristics, and to determine the stable time and total deformation of displacement convergence, provide a reasonable support time for second—lining. Analysis of measurement results of the main factors that determine rock parameters inversion.2. FLAC3D briefly introduced the basic principles and development, analysis of its strengths and weaknesses. And analysis runnel process of stress and deformation characteristics through the numerical simulation of the Dongshan-tunnel excavation and support in construction. Verification of the numerical model can be used as the tunnel surrounding rock parameters inversion is analysis procedures.3. Design of E and K, using procedures FLAC3D the BP neural network learning and training samples are built, parameters of surrounding rock tunnel are calculated by back analysis. Monitoring data and compared the scene to verify its accuracy to meet the requirements, provide a reasonable basis for the later design, construction, monitoring measurements of tunnel. |
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