Land damage evaluation in coal mining area with super-size mining face at western aeolian sandy area

According to the distinctive characteristics of fragile ecological environment and strong mining intensity in the super-size mining face at western aeolian sandy area, the paper took Daliuta Mining Area in Shendong as a study case, established the land quality index system and evaluation standard which divided the land quality in mining area into five levels, determin ed the evaluation index weight based on the entropy technology, and evaluated the land damage degree in mining area by using the improved gray correlation method. The evaluation results s how that the most important impact factors of the land quality in mining area include crack width, additional slope, sinking depth and erosion modulus; the second main impact factors include e ffective P, effective K, vegetation coverage, organic matter and others. The land quality of Daliuta Mining Area faces is in the fourth level, which indicates that the land damage is relatively seri ous leading to poor land quality, and the land condition needs to be improved. It is necessary to predict land damage circumstance before mining, optimize the mining technologies and control the topographic change in the mining process, and carry out the artificial restoration and self-recovery of ecological environment after mining to improve the land quality in mining area.