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全苏矿山测量科学研究院和各矿区研究所对缓倾斜煤层开采条件所做的分析表明,大约70％的煤层顶板的下位岩层是不稳定的,顶板允许的暴露面积不到8米~2。尤其在缓倾斜薄煤层(厚度小于1.3米),不稳定顶板很普遍。可是,到目前为止尚未研制出适于开采这种薄煤层专用的综采配套设备。顿涅茨煤矿机械设计院对这种条件所研制的—70型综采设备的井下试验表明,这套设备还不能保证及时地支护不稳定的顶板岩层。 在不稳定顶板条件下,使用批量生产的
An analysis of the mining conditions of gently inclined coal seams by the Institute of Surveying and Mapping and All the Mining Research Institutes shows that about 70% of the coal beds below the rock are unstable and the allowable exposed area of the roof is less than 8-2. Especially in the gently inclined thin seam (thickness less than 1.3 meters), unstable roof is very common. However, up to now no fully-mechanized mining equipment suitable for mining such thin coal seams has been developed. Downhole tests of the -70 type of fully mechanized mining equipment developed by the Donets Coal Mine Machinery Design Institute on this condition show that this equipment can not yet guarantee the timely support of unstable roof rock formations. In unstable roof conditions, the use of mass production