Shandong University

Zhongping Guo

Zhijie Wen

Jianguo Ning

Kegong Fan

Yong Jian

Zhongcheng Qin

Weizhen Liu

Huiqiang Duan

Qihua Ma

Hengze Yang

Wenwu Xie

A method is to excavate main roadways in the upper and lower parts separately and an inclined intake roadway in the central part of the mine and pre-excavate an inclined seam roadway as the first mining face at the boundary on one side of the mine. Staring from the mine boundary, the retreating mining shall be carried out on the first mining face strip by strip with belt conveyors arranged in the upper main roadway and assistant conveying devices in the lower main roadway and inclined intake roadway; the open-off cut of the first mining face shall be built on the underside of the upper main roadway at the boundary of the mine to carry out the downward inclined mining on the strike and along the inclination.

Kind of no-pillar and gob-side entry retaining mining and construction method without the mining area division

Provided is a method of forming a roadway by filling gangue paste during wide roadway excavation of a thick coal seam belonging to the technical field of mining industry. The method comprises: firstly designing a width of a filing strip and a width of a new excavation roadway according to a geological condition of a coal seam; secondly, determining a length of each filling, i.e. a cyclic filling interval, according to an existing excavation technical condition of a mining shaft; when the new excavation roadway is excavated, performing supporting for a roof, a floor and an inner side of a roadway by using a strong bolt and bolt-mesh-cable; then, after the new excavation roadway is excavated for the cyclic filling interval, starting to perform roadway-expanding excavation along an outer side of the roadway; when roadway-expanding excavation is performed, performing temporary supporting for a filling strip and a junction of the filling strip and the new excavation roadway by using a single hydraulic prop in cooperation with a metal articulated roof beam; finally, after roadway-expanding excavation is completed, removing temporary supports and filling the filling strip; afterwards, the above steps are performed alternately. In this way, coal losses caused by reserving coal pillars can be effectively reduced, the impact of the underground pressure during roadway excavation is relieved and the costs of gangue treatment and roadway excavation are lowered.

Roadway forming method by expanding excavating and filling gangue paste in thick coal seam

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Qingdao, China

Zhongping Guo