Research on collaborative control technology of “unloading and support balance” for surrounding rock of isolated roadway under the influence of dynamic pressure

Abstract

During the mining process of deep coal mining faces, they are often affected by strong mining dynamic pressure, resulting in strong mining pressure and significant deformation and damage of the surrounding rock of the roadway. Especially for isolated working faces, the dynamic pressure effect is more significant, and the difficulty of controlling the surrounding rock increases exponentially. In order to solve the problem of the influence of strong dynamic pressure on the control of surrounding rock in mining tunnels in deep isolated working faces, this paper takes 2308 working face as the research background and uses methods such as theoretical analysis, numerical simulation, and on-site verification. Firstly, the structural model of the surrounding rock in the tunnel is analyzed to determine the main factors affecting the stability of the surrounding rock in the working face. Further research will be conducted on the two options of coal pillar width and drilling pressure relief, and based on the actual deformation of the tunnel surrounding rock, the asymmetric support parameters of the tunnel surrounding rock will be determined to achieve a “unloading and support balance” collaborative control plan for the mining tunnel affected by strong dynamic pressure. After on-site practice verification, the displacement of the roof and floor of the 2308 working face roadway is 260 mm, and the displacement of the two sides is 471 mm. The integrity of the surrounding rock of the roadway is enhanced, and deformation is effectively controlled. The use of “unloading and support balance” has a significant control effect on the surrounding rock of tunnels affected by dynamic pressure.

Keywords

• deep roadway
• dynamic pressure influence
• island working face
• gob-side entry driving
• surrounding rock control