STUDY ON WEATHERING DEGREE OF BASALT IN A DAM FOUNDATION

The differences of weathering indexes and ranking of rock mass in three national codes were compared firstly. The engineering experiences of weathering evaluation in hydroelectric engineering were summarized. And then according to the characters of basalt in a dam site, the weathering indexes and classification were put forward. The quantitative evaluation of weathering of basalt in the dam site was arrived and the better basis of rock mass quality evaluation was provided.