|
Abstract The shortages of Mahalanobis distance discriminant method and analytic hierarchy process are improved；and the improved distance discriminant analysis method is applied to the classification of surrounding rock mass by TBM tunneling in west route of South-to-North Water Transfer Project. The standard of surrounding rock mass classification cut by TBM is divided into four classes according to the characters of TBM tunneling and some corresponding research results. The improved distance discriminant analysis model of surrounding rock mass classification of tunnel by TBM tunneling is established，which considers five indexes，that are rock strength，petrofabric characters，the distance of structure faces，the included angle between structure face and tunnel axis and quartz content. The linear discriminant functions are obtained by training with a large of case data which come from Duke River-Make River reaches in west route of South-to-North Water Transfer Project. And the classification of waiting discriminant samples is carried out with the discriminant functions. At last，the judged results of improved distance discriminant analysis method are compared with the results of traditional Mahalanobis distance discriminant method，RTBM(rating of TBM) method and RMR(rock mass rating) method. The effectiveness of improved distance discriminant analysis method is verified. The research results show that the improved distance discriminant analysis model has many advantages，such as high prediction accuracy，and provides a new effective method for surrounding rock mass classification of tunnel by TBM tunneling.
|
|
|
|
|
|
2012, Vol. 31 
