Abstract:

To evaluate the rock classification, a useful rock sub-classification method is needed to eliminate the subjectivism and empiricism and to improve the precision of rock classification. Therefore taking into account of the attributes of the current indices, quantification theory is adopted to give the rocky surrounding rock quantitative evaluation. At first the index system was built on the basis of survey; then 500 data was gained from the more than 800 examples of 72 tunnels; thus the quantitative evaluation was achieved. Finally, through case studies, the judge method based on quantification theory was tested and a high precision and reliability is achieved. The research results show: The indices of rocky surrounding rock sub-classification during construction are rock hardness degree, rock mass integrity condition and ground water condition. Self-check coincidence rate of the discriminatory equation and values based on quantification theory exceed 85%. Quantification theory is a reliable method in rocky surrounding rock sub-classification during construction.

Key words: tunnel construction, rocky surrounding rock sub-classification, quantification theory, quantitative evaluation