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| Research and application of pillar support technology for retaining roadway in right angle trapezoidal roadway
of inclined coal seam |
| Zeng Cheng, Du Jinchao, Ao Xuejun, Long Shengde |
| Guizhou Songhe Coal Development Co., Ltd., Liupanshui 553000, China |
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Abstract In order to ensure the smooth application of gob-side entry retaining technology in inclined coal seam mining face, taking 120306 return airway as the technical background, the technical feasibility and reasonable parameters of gob-side entry retaining with high-strength pillar roadside support were studied by means of engineering analogy, numerical simulation, field industrial test and mine pressure monitoring. The results showed that the diameter of the concrete pillar should be greater than 1.2 m and the layout spacing should be less than 3.0 m to control the instability and failure of the surrounding rock of the retaining roadway. The high-strength concrete pillar can make the roof of the goaf side break at its outer boundary, reduce the pressure of the surrounding rock of the empty roadway and improve its stability. The surface deformation of the retaining roadway was controlled at a low level, the ideal effect of retaining roadway was obtained.
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