在分析影响煤矿大面积采空区失稳危险状态的自然地质条件因素与指数W1和开采技术条件因素与指数W2的基础上,采用综合指数法对煤矿大面积采空区危险性进行了分级研究,确定了其危险状态等级评定的综合指数W。将煤矿大面积采空区失稳危险源分为4级,即Ⅰ级危险源（特大危险性：W≥0.8）;Ⅱ级危险源（重大危险性：0.6≤W〈0.8）;Ⅲ级危险源（较大危险性：0.3≤W〈0.6）和Ⅳ级危险源（一般危险性：W〈0.3）。结合实例,对河北某矿区煤矿大面积采空区失稳危险性进行了分级,实践表明,该分级方法是合理和可行的。%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≤W0.8）;Ⅲ-level dangerous source（higher risk：0.3≤W0.6） and Ⅳ-level dangerous source（general risk：W0.3）.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.
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