Efficient Excavation and Support Cooperation Technology for Surrounding Rock of Deep Buried Long-Distance and Large Section Gob-Side Roadway: A Case Study

Abstract

The gob-side roadway technology is widely used in coal mining in China, as it can improves the recovery rate of coal resources and alleviate the shortage of mining replacement. However, it is still difficult to control the stability of surrounding rock in gob-side roadway under deeper mining depth and more complex stress environment. With the auxiliary transportation roadway 30207 (ATR 30207) of the Muduchaideng Coal Mine as engineering background, this paper introduces the engineering case of gob-side roadway characterized by deep buried, long-distance, and large section. Through comprehensive methods, we studied and put forward the efficient excavation-support cooperation technology for surrounding rock of gob-side roadway. The research shows that the head-on cutting of gob-side roadway causes the stress to transfer and gradually adjust in the heading face to form a steady-state advanced abutment stress field. The coupling effect of the advanced abutment stress and the lateral abutment stress of goaf are the main reasons for repeated hole collapse of anchor cable drilling in solid coal rib, development and expansion of the roof separation fracture, and the low excavation speed. Supposed that upon the heading face support is completed, the next excavation-support cycle is quickly started during the early stage of stress adjustment, and the time effect can be fully utilized to alleviate the disturbance intensity of the advanced abutment stress in the heading face, as well as reduce the damage of rock mass. This paper puts forward the time-effect collaborative control countermeasures of the roof and rib in gob-side roadway of “hole collapse anchor cable of solid coal rib lag construction and waits for pressure relief and rapid excavation-support cycle in the heading face.” Engineering practice shows that the mine pressure behavior of roadway roof and solid coal rib is effectively controlled, and the roadway forming speed is greatly improved, which can provide reference for the efficient excavation-support design of gob-side roadway under the conditions of deep buried, long-distance, and large section in similar deep mines.

The Active Roof Supporting Technique of a Double-Layer Flexible and Thick Anchorage for Deep Withdrawal Roadway under Strong Mining Disturbance

“…It serves as a direct connection to the gob after the completion of mining operations, providing crucial spatial support for withdrawing the mining equipment [1,2]. The mining areas in the Inner Mongolia Autonomous Region and Shaanxi Province are the core regions of coal production in China, and the deep mining method has been widely employed in these mining areas [3][4][5]. To ensure the safe and efficient mining of deep coal, the mining equipment should be transported and withdrawn efficiently.…”

Multifactor analysis of roof deformation and reasonable determination of the unsupported distance of a coal roadway heading face based on response surface method

“…This results in increased boring and support cycle times, but low single‐cycle efficiency. Therefore, the problem of slow excavation cannot be solved only by improving the supporting speed, and the maximum empty head distance must be reasonably determined to improve the efficiency of a single operation as much as possible 11–13 …”

“…Therefore, the problem of slow excavation cannot be solved only by improving the supporting speed, and the maximum empty head distance must be reasonably determined to improve the efficiency of a single operation as much as possible. [11][12][13] Many investigators have researched methods for determining reasonable unsupported roof distances in heading faces. For example, Chen et al 14 Ma, 15 Yang et al, [16][17][18] and Bi et al 19 adopted mechanical models such as thin plates and rock beams to study the ultimate unsupported roof distance and the factors influencing the deformation and failure of the unsupported area.…”