Study on advanced regional control technology for strong mine pressure dynamic disaster in hard roof
Under the development condition of thick and hard roof,the mine pressure of fully mechanized caving face with large mining height is strong,which is easy to cause disasters such as rock burst and mine earthquake.In order to master the law of overburden fracture evolution under the fully mechanized caving mining condition with hard roof and large mining height,theoretical analysis,numerical simulation,field monitoring and other methods were used to reveal the disaster-causing mechanism of the caving and breaking impact energy at hard roof strata in the form of large cantilever beam.On the basis,the advanced weakening technology of staged fracturing for hard roof was put forward.The results showed that the lower hard rock strata often appeared as cantilever beam structure during the migration of overburden rock,and the structure was not easy to collapse,leading to the energy accumulation and mine pressure dynamic disaster.However,after the treatment of hydraulic fracturing advanced weakening technology,the roof caving step was significantly reduced with a average reduction of 54％,and the compressive strength was reduced by 21.67％,which effectively changed the degree of the lower hard roof breakage,expanded the scope of the caving zone of working face,impoved the degree of gangue filling in the goaf,and achieved the purpose of roof structure transformation and effective control of dynamic disasters.
hard roofstrong mine pressuredisaster-causing mechanismstaged hydraulic fracturingcontrol mechanism
万方数据
维普
