Application of the Grey Clustering Evaluation to Inhered Road Condition

During the rapid increase of the total built freeway mileage,early built freeway is in front of extension or heavy repair. To detect and make use of inhered subgrade has become a very significative problem. The Grey Theory is used to evaluate the quality of inhered freeway subgrade. A new method of evaluating the engineering suitable degree of the subgrade is put forward. At last the evaluating results are compared with drilling data and the practicability of this method is proved.