The Research On The Geological Predication And The Stability Classification Of The Surrounding Rocks Of Guandou Mountain Tunnel

The present paper elaborates the engineering geological conditions of Guandou Mountain tunnel area, using modern geophysical means in geological disaster forecasts of the tunnel in conjunction with the concept of numerical calculation method to do the system research of the rock stability of this tunnel. Followings are the research results:1. Geological analysis as the main line, a multidisciplinary approach to the tunnel Geological Prediction: forecast of the geological disasters ,respectively, on the long (middle), short scale, as well as the macro-and micro-scale,such as in the lithology of the tunnel, the rock category, grew up joints, faulting, broken belt, groundwater, and stress conditions,and other major engineering geological conditions and landslides , gushing water, to provide effectively a guide for construction.2.Through the long, medium and short-range forecasting and the level of drilling as well as the outcome of the analysis ahead of time, we concluded a set of Forecast Forecast System which can be applied in complicated geological conditions in the middle of highway tunnel under geological disasters: that is based on the geological analysis, the entire tunnel using holes sound probing (HSP), 100 m long distance range forecasting, using ground penetrating radar (GPR) to 40 m distance within the scope of the forecast, adopting geological analysis method 5-10 m within the scope of the short-range forecasting, and special sections using advanced drilling to verify the level of the whole CHT to carry out geological conditions Forecast predicted. On this basis, the Forecast is practiced as a normal construction process into the construction process.3. Through the analysis of the reasons why early and late damage has undermined the tunnel, the conclusion can be made about the seven factors that affect the stability of the rock in Guandou Mountain tunnel: degree of hard rock, rock quality indicators (RQD), the surface density structure, the characteristics of surrounding rock strata, structure lofts, groundwater, and the impact of stress conditions. 4. On the basis of the analysis on the status and trends of the surrounding rock classification in underground engineering, using the method is based on RMR of jointed rock and the help of fuzzy math theory and method, in view of the surrounding rock in rock classification categories and assessing indicators of the "fuzzy "relations, the establishment has been made of Fuzzy Information Classification System of the highway tunnel dedicated rock (" certainty "model classification standards).This realized the combination of qualitative and quantitative determination, and achieved realatively good result after engineering practice...