“Migrate-Transfer-Control” Support System of Surrounding Rock in the Deep Roadway and Its Application

Abstract

After coal mining enters the deep, the mining environment changes dramatically, and engineering disasters become increasingly prominent, which are mostly related to rock instability and failure. As traditional support is difficult to meet production needs, it is necessary to improve the support system. Based on the engineering background of the Pinggang mining roadway, this work studies the migration law of overlying strata in deep goaf by theoretical analysis and numerical simulation. The results show that the vertical stress and plastic failure range of the surrounding rock in front of the working face increase with the advance distance and when the working face advances to the first square, reaching the maximum. A stope spatial model considering the influence of horizontal stress is established. Combined with the theory of key strata, the stress transfer characteristics of overlying strata are analyzed. It can be seen that 0~30 m in front of the coal wall of the working face is the influence range of advanced abutment pressure, and the dynamic mining pressure in this range has a great influence. The inclined direction of the working face, 0~20 m away from the coal wall of the roadway, is the influence range of the solid coal abutment pressure. On this basis, the “migration- transfer- control” technical system of surrounding rock in deep stope face is put forward, i.e., the stress transfer of surrounding rock is caused by overlying rock migration, and the large deformation of surrounding rock is controlled by supporting means. Based on the original support scheme of the roadway, three reinforcement schemes are designed for the roof, the sidewalls, and both the roof and sides. The deformation control effect of the reinforcement scheme is far greater than that of the single factor, and the field monitoring effect is good. The research results aim to provide theoretical and technical support for the deformation control of mining roadways in the deep mining process.

Research on the Failure Mechanism of Surrounding Rock in a Dynamic Pressure Roadway and Active and Passive Coordinated Support Technology

“…Frequent damage phenomena, such as roadway tunnels' roofs breaking and falling, anchor bolts and cables shearing and detaching, and shoulder corners of the roadways severely squeezing and deforming, require regular repairs and maintenance. This has seriously affected the daily use of roadways and personnel safety, and the situation has gradually attracted the attention of experts and scholars [2,3].…”

Stand-Up Time Dependence on Protective Roof–Pillar Bearing Structure of Bauxite

“…At present, relevant studies on goaf bearing structures at home and abroad such as [10][11][12][13][14][15][16] mainly describe the bearing structure characteristics by establishing a hard rock beam model, and carry out static analysis of the structure by using structural mechanics and elastic mechanics methods. The most common mechanical model of load-bearing structures is the rock-beam model.…”

“…The numerical simulation based on the criterion of rock damaged fracture reflect the bending process of rock beams under three-point bending stress. Qin (2023) [16] established a stope spatial model considering the influence of horizontal stress. Through theoretical analysis and numerical simulation, the migration law of overlying strata in deep goaf was studied.…”