Study On The Main Control Factors Of Yushenfu Mining Subsidence And The Key Ecological Restoration Of Goaf

Yushenfu mining area has a rich coal resources, it is famous for high quality non-caking coal. With the full development of coal, Yushenfu mining area come forth large area goaf. The problems of safe and environmental disruption caused by mining subsidence are increasingly serious. Yushenfu mining area come forth large area land subsidence, not only destroy a great amount of cultivated land bu also caused severe damage to the mining area environment ecological environment.Mining subsidence has been studied for many years, researchers have achieved high quality research results in surface subsidence prediction and evaluation. But quantitative study on main control factors of surface subsidence is not perfect. This thesis objective is Study on main control factors to provide evidence for surface subsidence prediction and evaluation and control and prevent mining damage.This thesis chooses twelve diggings in Yushenfu mining area, according twelve complications confirm. Do principal component analysis of this eighteen main control factors by software of SPSS. The results show that, the ratio of mining depth and mining thickness is the most important factor; contribution rate of eighteen main control factors is 32.43%. The sorting of main control factors is the ratio of mining depth and mining thickness> recovery method and mining intensity > geological conditions > mine field > dip. Form the comparison study on Sorting of score of main control factors and Sorting of subsidence prediction; we know we can believe the result principal component analysis. But this analyze has some shortcomings, all of the mining area we choose are fully mechanized types and not considered the effect of fault and groundwater. How to quantization fault and groundwater as main control factors, further study is required.Research the ecological restorative of mining subsidence in Huojitu Mine, Shenmu County. Orthogonal Test on five crops: potato, mungbean, black soybean, broomcorn millet and sudan-grass, the result is that mining subsidence has no significant influence to emergence situation, but the mining subsidence has significant effect on and the production. The crop growth of non-mining subsidence is better than mining subsidence. Form the mechanism of mining subsidence effect on crop production; we know soil water content is the most important factor.In mining subsidence area, proper Technology should take to demonstrated the grain yield, change tradition agricultural planting system. Comprehensive consideration of crop production and economic income, we choose potato as the first crops of the mining subsidence land reclamation, better than black soybean and broomcorn millet. According to study area we put forward six kind of key ecological restoration: soil amelioration techniques, irrigation technology, crop choose technology, fertilization technology, field management technology and recycling of high stubble straw technology.