Improving Principles and Techniques of Coal Mine Goaf

At present,the coal mining depth is deeper,and goaf is more and more.In these areas,collapse and serious deformation commonly occurred.The goaf causes the problems about engineering stability and quality in coal mining.In addition,it seriously influences underground water level,which is serious against the growth of vegetation and ecological protection.On this basis,this paper mainly discusses the improving ways of coal goaf combining with cases.