Abstract
When a working face is crossing the abandoned roadways, problems such as roof subsidence, rock fracture, and instability will occur, resulting in widespread roof fall and rib spalling, which seriously affect safe and efficient mining on the working face. In this paper, the no. 23 coal pillar working face of Juji coal mine is taken as the engineering background, a mechanical model of crossing the abandoned roadways is constructed aimed at the problem of the working face crossing the abandoned roadway group, the collapse of the abandoned roadway roof is analyzed, a scheme of crossing the abandoned roadways is designed, and the development law of the stress and plastic zone after the reinforcement scheme is stimulated and analyzed. The results show that when the working face advances to the abandoned roadway, key block B crosses the abandoned roadway and the solid coal to form a “cross-roadway long key block.” It is calculated that the minimum support resistance required for the abandoned roadway is 6700 kN. Based on the results of numerical comparison, it is concluded that filling wood pile when the working face passes through the roof abandoned roadway and adding anchor cables for reinforcement support when the working face crosses the coal seam abandoned roadway effectively reduce the stress concentration of surrounding rocks, decrease the development of the plastic zone, and achieve safe and efficient mining when the working face crosses the abandoned roadways.
Highlights
In the process of coal mine production, in order to save coal resources and ensure smooth replacement of the working face, the reserved coal pillar is often recovered and mined
In the coal pillar mining, the coal pillar working face often passes through abandoned roadways, which are usually abandoned roadways that exist before the working face mining and lose their functions
The main problems faced in coal pillar mining include the following: (1) the occurrence conditions of the coal seam are complex, both sides of the coal pillar working face are goafs, and abandoned roadways can exist in the coal seams
Summary
In the process of coal mine production, in order to save coal resources and ensure smooth replacement of the working face, the reserved coal pillar is often recovered and mined. Bai and Hou [4] established a mechanical model of the working face through abandoned roadways and adopted the new technology of high water material filling to ensure the stability of the surrounding rocks of abandoned roadways. 23 coal pillar working face in Juji coal mine is taken as the research background, with the methods of theoretical analysis, numerical simulation, and field measurement, the deformation control characteristics of surrounding rocks in the mining in the coal pillar working face in a deep well is studied, and the support scheme for crossing abandoned roadways and the reinforcement support of the weak roof are designed, which ensures that the stope face crosses abandoned roadways smoothly The no. 23 coal pillar working face in Juji coal mine is taken as the research background, with the methods of theoretical analysis, numerical simulation, and field measurement, the deformation control characteristics of surrounding rocks in the mining in the coal pillar working face in a deep well is studied, and the support scheme for crossing abandoned roadways and the reinforcement support of the weak roof are designed, which ensures that the stope face crosses abandoned roadways smoothly
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