Abstract
In order to solve the problem of roadway support safety in coal mining under high stress conditions and to improve safe and efficient production in coal mines, the control countermeasures of the surrounding rock stability and the optimization scheme of support are put forward and the model and numerical simulation of roadway bolt support system are established. Based on bolt support theory and instability mechanism of the coal rock dynamic system, this paper puts forward the evaluation of support effect and the optimization parameters of bolt support, and the scheme of mine pressure monitoring and the corresponding support optimization system are established. The roof fall accident and the bolt and cable of support have been broken in the Wudong coal mine, the phenomenon of bolt pulling out in the roadway. The causes of roof fall are analyzed and the solutions are put forth, judging the influence of different factors on roadway support. In view of the roof fall accident in the North Lane of the east wing of the +575 level 43 #coal seam in the north mining area of the Wudong coal mine, the cause analysis and support suggestions are made. And, according to the performance of the bolting material and anchoring agent, the laboratory theoretical research was carried out. Through the experiment, it is concluded that the FRP bolt with a diameter not less than 27 mm is the first choice for the side support of the working face in the mining roadway, then ribbed steel bolt with a diameter not less than 20 mm for the nonworking face, and the length of the anchor rod not less than the range of the loose circle. Therefore, full-length anchoring should be carried out in roadway support, the anchorage length of the anchor cable should be increased, and the integrity of the roof should be improved, so as to reduce the amount of roadway roof separation and improve the support effect.
Highlights
Because of the different geological dynamic environment, the stress distribution characteristics and energy accumulation degree of coal bodies in different areas in the mining field are different; there are stress rising areas and coal rock mass areas with high degree of energy accumulation [1]
(1) e angle between the maximum principal stress and the strike of mining roadway is nearly vertical in the Wudong coal mine, and mining roadway is strongly affected by in situ stress; it is an important reason for the difficulty of roadway support in the Wudong coal mine
Considering the influence of the strength and elongation of the bar material on the supporting effect, HRB500 thread steel can be used for roadway support in the Wudong coal mine. e anchoring agent has good performance and should be stored in a suitable environment to avoid failure. e length of anchor should be increased or full-length anchorage should be adopted
Summary
Because of the different geological dynamic environment, the stress distribution characteristics and energy accumulation degree of coal bodies in different areas in the mining field are different; there are stress rising areas and coal rock mass areas with high degree of energy accumulation [1]. Wang et al [16] taking the weak cemented soft rock roadway of the Yi li No 1 mine as the research object, based on the analysis of deformation and failure of surrounding rock of the roadway, and optimization of support parameters by numerical simulation, put forward the scheme of anchor mesh cable coupling support. Xu et al [32] discussed the fracture instability mechanism and control technology of narrow coal pillar through the combination of theoretical analysis, numerical simulation, and field measurement and put forward the support scheme of fully mechanized top coal caving goaf roadway of the “high-strength bolt support + roof anchor cable channel steel composite structure + coal pillar side anchor cable reinforcement” and carried out field application. It provides important support for the technical progress and sustainable development of mines with similar conditions
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