Tendency Identification of Rockburst in Underground Engineering Based on Extension Theory of Dynamic Weight

摘要

Based on the matter-element theory and dependent function, the extension theory was introduced to evaluate the rockburst tendency, and an extension classification evaluation method for the rockburst tendency was put forward. Firstly, three factors, σo/σc, σc/σt and Wet were defined as the criterion factors for rockburst identification. Secondly, classical Meld and limited field were constructed. Thirdly, an extension classification model was established to predict the rockburst tendency by applying the correlated functions of matter elements and extension sets. Furthermore, from the definition of weight, it is pointed out that the factor weight is not unchangeable, which can vary with the difference of actual values of factors, and taking this as starting point, the improved A HP method for weight calculation based on the simple dependent degree was proposed. Finally, a series of underground rock projects were evaluated with the proposed model. The evaluated results agree with the practical records, which show that the extension theory method is effective and feasible in identification of rockburst tendency. Moreover, using improved AHP method to calculate the factor weight can avoid the disadvantage of overmuch effect of subjective element in the process of weight calculation and make the result of weight more objective.