A Research Of Risk Assessment And Measures During The Construction Based On The Geology Forecast

With the extension of tunnels to the mountainous areas, the number of the highwaytunnels is increasing gradually. The geologic conditions itself and all other factors may lead tocertain risks when the tunnel is constructed in the bad geology areas. Thus, it has attractedpeople`s attention to the risks assessment during the tunnel construction. Both effective risksassessment and control of risks has become an important part.In terms of the assessment methods, most methods are qualitative and much subjective,such as the Experts Investigation Method, etc. All these methods are much subjective, and theinfluence factors of risks are also much random and discrete. Moreover, between thesemethods, the assignment of related parameter is often different with individuals, and this willcause the inconformity of the assessment result easily.This paper is based on the practical engineering program, and assesses the special risksbased on the geology forecast during the construction.Combined with the ExpertsInvestigation Method and GPR as the method of the geology forecast to detect the risk factorsof the tunnel, and the tunnel is classified into several sections based on these risk factors.Making the special risk assessment for these sections with the method of Fuzzy AHP based onthese risk factors; as for the risk treatments, it analyzes the feasibility of the constructionmethods and the supports with the Numerical Calculation. The use of this method offersreliable informations to the construction, and improves the realistic value of risk assessment.Meanwhile, it offers reference to the risk assessment during the construction in the future.