Numerical Method For Forecast Water Gush Of Tunnels And Evaluation Of Engineering Step Measurement

Water gushing of tunnel is not only affect the normal construction, but will also affect the security after the completion of operations, and sometimes would undermine the structure of the tunnel, interrupting traffic, causing huge economic losses. Through theoretical analysis, numerical simulation method, the thesis will predict the tunnel inflow. At the same time, the gushing tunnel project management measures quantified assessment studies.This thesis based on fractured rock flow combined the theory of tunnel rock with the peculiarities of basic fractured rock flow theory - Darcy's law and the basic flow equation, then established two-dimensional tunnel inflow prediction equation. According Shi-tai passenger dedicated railway of Nanliang tunnel hydrological and geological conditions and engineering geological conditions, built a reasonable hydrogeological conceptual model, based on this corresponding numerical model, rationally define its boundary conditions and parameters such as permeability coefficient, the radius of influence , and so on, using computer programs solution model, which predicted Shi-tai passenger dedicated railway of Nanliang Tunnel inflow. Under such circumstances predicted by the inflow is not yet taken any measures to control the situation arising from the excavation of rock inflow, through the analysis forecasting water results, the corresponding section will be made by engineering measures into a model of the boundary change initial conditions into the equation, using a computer program calculated results, according to the results of data analysis results and icon of the effectiveness of the measures mentioned in the actual construction process in the water gushing of tunnel project management and reasonable measures to provide reference. For the general section under inflow take corresponding measures, and for some segments excessive water gushing in the construction process require special attention, not construction inflow big lots to be prepared in advance, to reduce losses minimum.Based on the numerical method to predict the Shi-tai Passenger dedicated railway of Nanliang tunnel inflow and quantitative assessment of the effectiveness of the measures mentioned. In this paper, the results of research on the accurate prediction of Passenger dedicated railway tunnel inflow size and the effective assessment measures have played a positive role.