Study on the rapid evaluation method of mining subsidence damage in Yu Shen Fu mining area

Abstract

Considering YuShenfu coal mining area, this paper uses the Gray correlation analysis method to analyze and select the 7 major factors which come from two aspects that are geological occurrence condition and coal mining design condition, on the basis of analyzing the formation mechanism of mining subsidence in the study area. And the five of seven which are disturbance coefficient, width-depth ratio, comprehensive hardness of overlying strata, subsidence factor, the ratio of mining depth and height were selected as key impact factors and they would be the evaluation indexes in the damage assessment behind. Then, this paper applies a new method, called polygon area method, to evaluate the mining subsidence damage. And the results are going to compare with results of fuzzy comprehensive evaluation method. The results show that: first, in the YuShenFu mining area, 11 of 12 sample points reached a serious level of the mining subsidence damage, just only one reached moderate. So, the mining subsidence damage of Yushenfu mining area has been very serious on the whole, which consistent with the fact; second, the evaluation results based on polygon area method had a good identical to mature and reliable fuzzy comprehensive evaluation method. It shows that polygon area method is stable and reliable; third, all of 5 evaluation indexes can obtain easily with the basic parameters of the geological and mining, additionally, polygon area method has several advantages such as clear physical meaning, comparability and simple, which show good convenience. The polygon area method will become a new method of the fast and accurate evaluation of mining subsidence damage in the coal mining area.