A Study On The Estimation Of Water-Gushing Amount In Qiyueshan Tunnel

Water-gushing is one of most attentive problems in tunnel construction. With the development of tunnel's design, construction technology and mechanism, many design schemes for long distance and deep buried tunnels are made, which will cause this problem more and more prominent and imminently to be solved.In this paper, combined with the geological condition of Qiyueshan tunnel in Yi-Wan Railway, the qualification and influencing factors of occurrence of water-gushing in karst tunnel are deeply studied. It presents that the capability of energy stockpile and release in water-bearing surrounding rock, hydrodynamic capability, and the stabilization of surrounding rock and so on are all the necessary conditions of occurrence of water-gushing in tunnel, and they also decide the scale and intensity of water-gushing. Based on this theoretically analyzing, the theory and method of estimation of water-gushing are studied comprehensively. At the same time, the advantage, disadvantage and applying rang of variety forecasting methods are studied and compared.Aimed at the karst developing character and the karst water moving rule in the area of Qiyueshan tunnel, method of infiltration coefficient of precipitation, modulus method of groundwater runoff, method of hydrogeological analogy and method of grey incident degree analysis and grey dummy variable multiple regression analysis are adopted to calculate and forecast the water-gushing amount. Incorporated with location condition, correlation parameters have been corrected to ensure the forecast accuracy and reliability. At last, comparing with the four methods forecasting results, the estimation of appropriate water-gushing amount has been adopted, and corresponding solutions have been advised.The studied result has referenced effect on the estimation of water-gushing amount of Qiyueshan tunnel and other tunnels.