Effect of different machinery and rolling times on the physical property of reclamation soil in coal area

At present, coal is the primary energy of China, accounting for 74% of disposable energy consumption, and China is also the world’s largest coal producer and consumer (Hu & Wei 2003). However, coal mining has caused a lot of land destruction. According to the data concerned show that, China’s destructive land cumulatively of industry and mining is about 4 million hectares, of which the largest number is the coal mining subsidence land, and it is still increasing at a rate of 40000 hectares annually (Wang et al. 2009).