Multi-factorial Comprehensive Estimation for Jinchuan's Deep Typical Rockburst Tendency

The rocks in a deep mining area in Jinchuan 2nd mine are studied in this paper. Several mechanical experiments were conducted, including pre-peak loading and unloading, for six kinds of typical rocks, such as granite, marble and peridotite. Combined with the prospected data, different rockburst criteria, like the coefficient R method, Barton method, elastic strain energy index WET method and rock mass rating system method, are employed, respectively, according to different lithology and stress conditions to theoretically forecast the rockburst tendency of the rock mass. Fuzzy mathematics comprehensive prediction method is also used, with its index being based on each single criterion results, together with the expert-system evaluation method to determine the weight of every impact factor, to evaluate systematically the rockburst tendency of rock in Jinchuan No. 2 Mine. Results show that the single traditional rockburst forecast method is not suitable for the special geological environment in Jinchuan, while fuzzy mathematics comprehensive prediction method can provide better results. Six types of rock specimens, such as granite, marble, are of weak rockburst tendency, which are in accordance with the situ results. The forecast method proposed in this paper provides some guidance for preventing rockburst in mining excavation.