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| Research and application of gob-side entry driving technology without coal pillar in Chengjiao Coal Mine |
| Yang Changrui |
| Chengjiao Coal Mine, Henan Zhenglong Coal Industry Co., Ltd., Yongcheng 476600, China |
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Abstract In order to reduce the deformation of roadway and improve the recovery rate of coal resources, the research on the support technology of gob-side entry driving without coal pillar is carried out in the track roadway of the fourteen auxiliary mining area in Chengjiao Coal Mine. The pressure observation of bolt cable and other supporting bodies by dynamometer shows that the support pressure of gob-side entry driving without coal pillar presents asymmetric distribution. An asymmetric support scheme is adopted for this design. The roof is supported by bolt + steel mesh + steel ladder + anchor beam. The left side of the roadway is supported by bolt + steel belt + steel mesh, and the right side of the roadway is supported by 29 U steel shed column + steel mesh. The observation shows that the maximum separation amount is 61 mm, the maximum floor heave is 120 mm, and the roadway deformation is within the controllable range.
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