Experimental study on non-pillar gob-side entry retaining and roof-cutting combination support in shallow buried coal seams

Aimed at the problems of surrounding rock support in non-pillar gob-side entry retaining under multiple coal seams, racture instability characteristics of 1 ateral roof along the gob-rib support are studied.The paper induced that lateral roof were cut along the roadway, support resistance reduced quickly; based on this conc lusion, the design of entry-side roof-cutting support was discussed. The resistance, shrink and lateral gangue pressure of roof-cutting combination support for pillarless gob-side entry retaining was checking by combining conditions, such aspreset load, preset deformatio, ateral gangue pressure and loor specific pressure, which was Su ccessfully testing in Work Face 3101 of Laomupo Coal Mine. The conclusion indicated that the deformation value of the roof and floor could stayed within 225 mm, the d eformation value of two sides could stayed within 243 mm, the deformation speed could stayed within 1 mm/d. The field measured data indicated that this support meth od had a remarkable effect and strictly controlled the roof sink and provided enough support resistance. The research results can provide some useful experience for th e gob-side entry retaining work under the similar condition.