Research on Walling-up with Concrete Block Technology of Gob-Side Entry Retaining Based on Fully Mechanized Face in Medium-Thickness Coal Seam

Abstract

Gob-side entry retaining is an advanced and green mining technology, which can avoid using pillar and island working face, reduce driving workload, alleviate the tension between extraction and driving, and achieve a Y-type ventilation. The coal mine in this research successfully reserved a 485m roadway in No.10302 fully mechanized coal face by employing wide lane driving, pre-driven roadway, pre-controlling immediate roof in the roadway, and gob-side entry retaining by walling up with multi-standard concrete block using break-joint vertical stacking technology. From doing so, the supporting effect is significant, the roadway is integrated and the stable wall is free of distortion or cracking. This research paves a new way for gob-side entry retaining of fully mechanized mining in China.