Analysis of Surrounding Support and Stability on Gob-side Entry Retaining with Flexible- formwork Concrete in Shallow Seam

Combined with rapid gob-side entry retaining engineering practice in No.43308 working face of Yujialiang Mine, this paper introduced gob-side entry reta ining support form and parameters in shallow buried depth, thin bedrock, rapid mining, high output and efficiency mine:using flexible-formwork concrete wall as gob-side support, using anchor-net-cable as roadway-in support;lagging temporary support by pillars and long beam, retraining gangue support by wood column and metal mesh, and studying the pressure of concrete wall which being 1 meter thick in roadway-side.The mine pressure observation results of gob-side entry in No.43308 working face showed that gob-side entry's peak pressure laged behind working face 60 m, the maximum was 10 MPa;gob-side entry along the roof and floor closer for the maximum amount was 60 mm, to achieve stable after 200 m away from working face.The technology with flexible formwork concrete as gob-side entry retaining support in shallow coal seam was reasonable and the effect was obvious.