Abstract
China is one of the leading countries in the mining and utilization of coal resources, and the problems of coal-mining technology and safety have been concerned by the world, while the serious deformation and destruction of surrounding rock and the difficulty of support have brought inconvenience to the mining of coal resources due to repeated mining. This paper takes the actual engineering 22205 mining roadway in Buertai mine as the research background, through the combination of numerical simulation and field measurement. In this paper, the stress environment, plastic zone, and surrounding rock deformation in the advancing process of coal-mining face are studied, and the stress evolution law of surrounding rock in repeated mining roadway is obtained. It is clarified that the surrounding rock deformation is the failure mechanism under the combined action of principal stress difference and stress direction deflection. As a result, the surrounding rock of the roadway is asymmetrically deformed and destroyed, and the corresponding surrounding rock control scheme is put forward. The results show that the influence of repeated mining on roadway stress environment can be divided into four stages with the mining process: the stability stage of mining influence, the expansion stage of primary mining, the stable stage after primary mining, and the expansion stage of second mining. At the same time, the shape changes of the plastic zone and the displacement monitoring results of the monitoring are analyzed, and the results are obtained; the stage of stress change is suitable, and combined with the failure characteristics of surrounding rock in each stage, it is put forward that reinforcement measures should be taken in the stable stage after mining; the specific reinforcement scheme is determined according to the expansion form of plastic zone and field measurement. The on-site monitoring shows that there is no roof fall accident during the use of the roadway, which ensures the safety in production.
Highlights
Coal is one of the three major energy sources in the world and accounts for one-third of the global energy consumption
The mining intensity of coal mines has been increasing, of which the double-roadway layout is mostly used in ten million ton coal mines, which reduces the number of moving of coal-mining face, improves the output and efficiency of coal-mining face, solves the problem of long-distance single head driving ventilation, and makes the transportation of coal, materials, and pedestrians more convenient, and the transportation, installation, and withdrawal of coal-mining face equipment are more convenient; speed up and flexibility create many convenient conditions for the production of the coal-mining face
Advances in Civil Engineering the damage degree of repeated mining is greater than that of the primary mining, which directly affects whether the coal resource mining process can be carried out safely and smoothly. erefore, the failure mechanism of surrounding rock of the repeated mining roadway is worthy of in-depth study
Summary
Coal is one of the three major energy sources in the world and accounts for one-third of the global energy consumption. E above study on the stability of roadway under the condition of double roadway arrangement provides valuable experience, but the process of failure mechanism and characters of roadway surrounding rock in the process of repeated mining needs further study. In this paper, based on the engineering background of the air return roadway of coal-mining face 22205 in Buertai, through studying the stress evolution of the surrounding rock and the expansion and change of the plastic zone in the roadway, to reveal the stage and the plastic zone failure mechanism in the process of roadway failure, so as to provide the basis for the control method of the surrounding rock and the stability control technology of the surrounding rock in the repeated mining roadway, which has certain theoretical significance to ensure the safe and efficient production of the mine and practical value
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