煤层底土 undercast; seasoning timber
煤层黏土脉 Spar
拌煤黏土 Clay
大倾角地层煤层气钻井 CBM well boring in strata at great inclination
煤层层数 coal layers
煤层底板 coal seam floor; seam floor; thill; coal seam floor rock mass; coal seat; coal floor; floor of coal seam; seamfloor
煤层底板突水 water inrush from coal seam floor
煤层底板粘土 warrant
煤层底板注浆改造技术 grouting techniques on coal floor
煤层底部突起 hog back
煤层煤样 coal seam-sample; coal seem sample
煤层煤质 coal seam a nd coal quality
煤底土 coal seat
深层煤层气 Coal bed methane
1.积水地的水底土层2.荖叶 Pan
剥层黏土 delaminated clay
薄层黏土 paper clay
成层黏土 varved clay
成层土层 layered-soil