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Non-homogeneity of the deformation and failure of the tunnel within weak rockmass and its controlling countermeasures

ZOU Zheng sheng 1, LIU Ming hui 2 (1 Beijing Urban Construction Research Institute, Beijing 100081,China; 2 General Institute of Architectural Research of MMI, Beijing 100081,China)  
The modes of non\|homogeneity of the deformation and failure of the tunnel within weak rock mass are summed up. The cause of the non\|homogeneity is analyzed with geo\|engineering view. The analysis indicates that the non\|homogeneity associates with the non\|homogeneity in aspect of both weak rock mass and its environment, construction factors,which cause supporting system not to match with deformation process of weak rockmass. Then some corresponding controlling countermeasures are summarized in the paper. The necessity of uniting some countermeasures is pointed out. In order to use correctly these countermeasures, it is stressed that the engineering geology must be firstly used in researching in detail, and that the engineering geological condition, mechanical characteristics and behaviors of weak rock should be mastered. It is also emphasized that the geotechnical design thinking and principle under the condition of large deformation must be followed during design of supporting.
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