大南湖七矿极近距离煤层合并开采顶煤冒放性评价

Evaluation on Caving Ability of Top Coal in Combined Mining of Extremely Close Seams in Dananhu No.7 Coal Mine

以大南湖七矿一分区5煤、6煤为工程背景,采用理论计算、模糊数学、层次分析法对一分区各钻孔对应柱状进行综合分析,采用多指标综合隶属函数确定5+6煤合并综放可行性及冒放性特征。主要结论如下:一分区5煤、6煤合并综放开采时顶煤冒放性以Ⅲ类(中等)和Ⅱ类(较好)为主,局部区域的顶煤冒放性分别为Ⅳ类(较差)和Ⅴ类(差);合并开采顶煤冒放性取决于上覆顶煤和顶板较硬、较厚岩层的性质与层位。

Based on the engineering background of No.5 and No.6 coal seams in No.7 coal mine of Dananhu,uses theoretical calculation,fuzzy mathematics and analytic hierarchy process to comprehensively analyze the corresponding column shape of each borehole in No.1 coal seam,and uses multi index comprehensive membership function to determine the feasibility and caving characteristics of No.5 and No.6 coal seam combined with fully mechanized caving.The main conclusions are as follows:the top coal caving ability of No.5 coal and No.6 coal combined with fully mechanized top coal caving mining in the first division is mainly class III(medium) and class II(good),and the top coal caving ability of local area is class IV(comparatively poor) and class V(poor),respectively;the caving property of top coal in combined mining depends on the property and horizon of overlying top coal and hard and thick roof strata.