Comprehensive Treatment Methods of Floor Heave Disasters in Mining Areas of China

With the increasing depth of underground coal mining in China year by year, the problems of the floor heave of roadway become more and more serious. As one of the main forms of the deformation and failure of the surrounding rock in the soft rock roadway, floor heave is the most difficult problem to be solved in the deep mining of coal mines and other underground tunnel engineering. In order to control the floor heave effectively, Chinese scholars have systematically studied the treatment methods of floor heave under various conditions. In this paper, the direct reinforcement method, the indirect reinforcement method and the unloading method are analyzed emphatically, and the comprehensive treatment methods of the grouting bolt combined with reinforcing sidewalls and corners for the floor heave are put forward. After the engineering application of the methods of the grouting bolt combined with reinforcing sidewalls and corners in Baode coal mine, the floor heave of the roadway is controlled at 283 mm and the reinforcement cost of roadway floor is reduced by 40%, which has achieved remarkable technical and economic results. Finally, the prevention and control of floor heave technology is prospected.