Key technology of cutting roof in fully mechanized caving face with a height of 6 m

Abstract

In order to solve the problem of roof sinking and serious floor heave caused by mining without coal pillar in No.2 coal mine of Sangshuping in Hancheng Mining Area, the field test and construction of roadway retaining along gob in fully mechanized caving coal with a height of 6 m were carried out. Advanced roof cutting was carried out for the roadway retaining by means of energy-gathered blasting, the direct roof and part of the basic roof of the roadway are cut off to change the stress distribution characteristics of the surrounding rock of the roadway, and the pressure-relief treatment is carried out in advance for the stability of the roadway during the influence of mining. During the working face advancing and mining, the retaining roadway is reinforced with “anchor cable + steel beam + concrete filled steel tube pillar in the roadway”, which can meet the requirements of large deformation of roadway surrounding rock.

Keywords

• fully mechanized caving face
• energy-gathered blasting
• pressure relief by roof cutting
• gob-side entry retaining
• concrete-filled steel tubular column