Experimental Study on the Instability Law of Brittle Coal Rock Material Structure under Deep Complex Stress Environment
In order to solve the problem of strong mining pressure in the western mining area,in view of the unknown migration law of overlying strata under strong mining,and the dynamic load disturbance ac-tivities such as roof fracture,the multi-field coupling rock mass dynamic disturbance test system was used to carry out the deep complex stress environment mechanical loading test on brittle coal rock materials,so as to study the failure response characteristics of coal samples under composite loading conditions.The results show that after the combination of static and dynamic loading,the failure cracks of coal and rock increase and the strength decreases,the characteristics of active acoustic emission signal,severe damage and small fragmentation are showed.The dynamic load disturbance reduces the strength of the coal sample,and the dy-namic load with lower frequency can strengthen the damage intensity of the coal sample and induce the coal sample to undergo severe damage such as coal burst.The analysis results provide a theoretical reference for the management of strong mine pressure problems in western mining areas.
coal rockdynamic and static superpositionsound emissionfracture characteristic
万方数据
维普
