School of Mining Engineering Taiyuan University of Technology Taiyuan 030024 Shanxi China;
School of Mining Engineering Taiyuan University of Technology Taiyuan 030024 Shanxi China;
Geological Survey Department Yangquan Coal Industry(Group)Co. Ltd. Yangquan 045000 Shanxi China;
Geological Survey Department Yangquan Coal Industry(Group)Co. Ltd. Yangquan 045000 Shanxi China;
Loess layer; Main geological and mining factors; Ground cracks; Ground slope; Underground coal mining;