Development and application of a series of experimental devices for coal mining dynamic behavior research

It is difficult to change the pattern of coal energy consumption in China over a short time frame. The combined action of static load (nonuniform load) and dynamic load (disturbance stress) often induces dynamic instability in underground engineering rock masses. It is difficult to quantitatively study the nonuniform load and disturbance stress of different underground projects by means of field monitoring. It is of great practical significance to study the failure characteristics of rock under the action of nonuniform and disturbance stresses and improve the understanding of engineering disaster prevention and control using laboratory tests. In view of the mechanical response mechanism of coal and rock masses under mining stress and the failure characteristics and disaster-causing mechanism of engineering rock masses under different disturbance forms, a research group studying mining dynamics independently developed a series of testing systems, including a “mining dynamic stress test system” and a “creep and dynamic disturbance impact loading test system”, which established a mining stress laboratory and used physical experiments to assess the above problems. Based on a series of test equipment and acoustic emission (AE) technology, with event location as the parameter index, the failure laws of rock strength and AE characteristics of samples with different horizontal stresses under nonuniform loading based on AE events and different disturbance stress loading paths are studied. The failure characteristics and time–space damage laws of rock under different disturbance combinations are restored at the test scale, and the time–space characteristics of rock damage and failure under nonuniform loading are revealed. Article Highlights Relying on the self-developed “creep and dynamic disturbance impact loading test system”, the failure characteristics of engineering rock mass under disturbance stress was studied. Relying on the self-developed “Mining-induced stress test system”, the research on the temporal and spatial characteristics of damage and failure of engineering rock mass under non-uniform load was realized. The laboratory of mining stress was established,and the development process of mining stress was reproduced in the laboratory. Relevant achievements fill in the deficiency of mining dynamics test equipment.