晋城矿区东部9号煤层及其顶底板岩性的研究

通过对 9号煤层及其顶底板岩性的研究 ,得出如下结论 :9号煤层煤层厚度变化很大 ,但层位稳定 ,在现代开采技术条件下应属大部可采煤层 ;9号煤层顶板K4灰岩厚度不稳定、相变大 ,须注意小于 0 .5m厚度顶板范围及相变部位的顶板管理 ;9号煤层底板为高岭石粘土岩 ,遇水易膨胀底鼓 ,对综采机械化生产可造成影响

Researches on No.9 coal seam and its roof and floor lithologic in the eastern part of Jincheng coal mining area

It has researched No.9 coal seam and its roof and floor lithologic.A conclusion has been drawn,that is,there is great changes in the thikness in No.9 coal seam,but the seam position is stable.So,it is considered that most part of the seam can be mined with the advanced mining technology.It is also stated that the thikness of the limestone K 4 of the roof in No.9 coal seam is unstable and its phases are changeable.Therefore,more attention should be paid to the control of the scope of the roof thikness which is less than 0.5?m and the phase change positions of the roof.It has explained that there will easily occur expansion and heaving floor when meet with water because the floor of No.9 coal seam is Kaolinit clay.As a result,the comprehesive mining mechanical production will be effected by the above mentioned.