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Belong to the most important engineering work sites in which the mountain highway design , construction , tunnel engineering , tunnel engineering construction safe or not directly affect the security and stability of the entire line , while in the process of investigation and design of the tunnel project , the most fundamental , the core problem is the problem of tunnel surrounding rock classification , tunnel builders are now more and more recognized that in which the mountain highway construction on the tunnel wall rock fast , accurate grading directly determines the design of the entire line construction and safe operation. First, the basis of previous studies , the method of tunnel surrounding rock classification system summary on several commonly used tunnel surrounding rock classification method set forth . Combination before the surrounding rock classification method research in the study of environmental and geological conditions in the study area , according to the characteristics of the study area 21 tunnels , each tunnel proposed tunnel surrounding rock classification method . Second, the previous selection of tunnel surrounding rock classification evaluation factors applicable Baiyun Mountain tunnel surrounding rock classification of the seven evaluation factors : rock uniaxial compressive strength , the level of the degree of influence of the geological structure , joints and fractures Level weight , structural features and the complete state of the rock quality , elastic wave velocity and rock mass integrity coefficient , and the analytic hierarchy process to determine the evaluation factors . Finally , the use of fuzzy comprehensive evaluation method dialogue Yunshan tunnel paragraph 13 Rock Classification fuzzy evaluation , while the results of its results with site grading methods (BQ method ) are compared and the following conclusions : 13 segment of the tunnel circumference rock hierarchical fuzzy evaluation results and site grading method the (BQ Act ) and the results are consistent , and the former over the latter . 1,5,9,13 segment surrounding rock level of the Ⅴ Grade surrounding rock ; 2,6,12 segment of wall rock grade Ⅳ grade ; 3,4,7,8,10,11 segment wall rock grade Ⅲ grade . We build the tunnel surrounding rock classification ideas , not only a more accurate evaluation of tunnel surrounding rock classification of the study area , and also to provide a reference for the area similar type of tunnel surrounding rock classification , has some reference significance .
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