Study on large deformation and failure characteristics of water-rich roof and zoning dynamic support technology

The water-rich roof has a strong impact on mining roadway excavation and service period. The water absorption or loss process of roadway roof will weaken its integrity, causing large deformation of roadway and affecting the safe and efficient production of working face. Taking the 22204 working face of Buertai Coal Mine as the research object, defines the distribution characteristics of the plastic zone in different sections of roadway by using the comprehensive research methods of theoretical analysis, field detection and numerical simulation. It is believed that the plastic zone in water bearing section is about 5 m under the condition of no support, which is obviously 2 m larger than the plastic zone in the normal section, and the plastic zones are obviously asymmetric. At the same time, increasing the support strength can significantly control the plastic zone radius of water bearing roadway. On this basis, the zoning dynamic support scheme of “anchor cable + steel belt” reinforcement support for roadway in roof water-rich section is proposed and industrial practice is carried out, and the surrounding rock control effect is remarkable.