Abstract
The gob-side entry driving is driving in low pressure area, which bears less support pressure and is easy to maintain, so it is widely used. Taking the gob-side entry driving in thick coal seam of Dongtan Coal Mine as an example, the reasonable size of pillar and the section of roadway are numerically simulated by combining numerical with measurement, and the roadway support is designed. According to the distribution of lateral stress in working face, eight pillars of different sizes are designed. By simulating and comparing the stress distribution of surrounding rock and the development range and shape of plastic zone in different positions, the pillar size of gob-side entry driving is optimized to be 4.5 m. According to the results of optimization of roadway section, the section of straight wall semi-circular arch roadway is adopted. According to the analysis, the roadway is supported by bolt + steel mesh + anchor cable. By observing the stability of roadway, it provides experience for the stability study of roadway the gob-side entry driving with small pillar in thick seam.
Highlights
The size of coal pillar in mining area has a great influence on the recovery rate of coal seam
Taking the gob-side entry driving in thick coal seam of Dongtan Coal Mine as an example, the reasonable size of pillar and the section of roadway are numerically simulated by combining numerical with measurement, and the roadway support is designed
The research shows that the coal loss of the gob-side entry driving with small coal pillar is smaller than that of the gob-side entry driving with large coal pillar, and the coal loss can be reduced as much as 6% ~ 9.5%
Summary
The size of coal pillar in mining area has a great influence on the recovery rate of coal seam. It is necessary to take advanced theoretical analysis and optimization to find the balance point between them. (LI 2016; WANG 2015; ZHANG 2015; Yan 2013)
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