Abstract:
On the basis of analyzing natural geological factors and index
W1,mining technology factors and index
W2 that influencing widespread mined-out area instability dangerous states,the risk of coalmine widespread mined-out area was classified with comprehensive index method,and the comprehensive index
W of grade evaluation in its dangerous state was determined.The instability dangerous source in widespread mined-out area was divided into four: Ⅰ-level dangerous source(extraordinarily serious risk:
W≥0.8);Ⅱ-level dangerous source(serious risk:0.6≤
W<0.8);Ⅲ-level dangerous source(higher risk:0.3≤
W<0.6) and Ⅳ-level dangerous source(general risk:
W<0.3).According to the example,the instability risk of widespread mined-out area in one mining area of Hebei was classified and the practice showed that the classification criterions are reasonable and feasible.