ASSESSMENT METHOD FOR GEOLOGICAL CONDITIONS OF SURROUNDING ROCKS ALONG HIGHWAY TUNNELS AND ITS APPLICATION TO FUXI TUNNELING

In order to quickly and accurately classify surrounding rock and instruct the tunnel construction, and on the basis of comprehensive review of the surrounding rock classification methods in domestic and abord, the paper proposes a method for quickly classification of surrounding rocks during tunnel construction period. The method combines qualitative and quantitative evaluations and uses experts evaluation method to quickly obtain the appraisal result for observing, measuring and appraisaling the surrounding rocks in the scene of excavating tunnel face. It does not need complex experiments and computations. In order to comprehensively reflect the tunnel surrounding situation and accurately appraise the project nature, and take into consideration of the Q-system, the paper appraises the surrounding rock of Fuxi tunnel on the basis of the first hand survey data using both the quick classification method and the Q-system method. It provides the rational supporting parameters for the construction of Fuxi tunnel.