Abstract
The gob-side roadway in an isolated island working face is a typical representative of a strong mining roadway, which seriously restricts the efficient and safe production of underground coal mines. With the engineering background of the main transportation roadway 1513 (MTR 1513) of the Xinyi Coal Mine, this paper introduces the engineering case of gob-side roadway driving with small coal-pillar facing mining in an isolated island working face under the alternate mining of wide and narrow working faces. Through comprehensive research methods, we studied zoning disturbance deformation characteristics and stress evolution law of gob-side roadway driving under face mining. Based on the characteristics of zoning disturbance, MTR 1513 is divided into three zones, which are the heading face mining zone, the mining influenced zone, and the mining stability zone. A collaborative control technology using pressure relief and anchoring is proposed, and the differentiated control method is formed for the three zones. For the heading face mining zone, the control method of anchoring first and then pressure relief is adopted; for the mining influenced zone, the control idea of synchronous coordination of pressure relief and anchorage is adopted; for the mining stability zone, the control method of anchoring without pressure relief is adopted. Engineering practices show that the disturbance influence distance of working face 1511 on MTR 1513 changes from 110 m advanced to 175 m delay. At this time, the surrounding rock deformation is effectively controlled, which verified the rationality of the division and the feasibility of three zoning control technology. The research results can provide reference for gob-side roadway driving with small coal pillar facing mining in a special isolated island working face.
Highlights
The gob-side roadway in an isolated island working face is a typical representative of a strong mining roadway [1], whose surrounding rock control problem is one of the major technical challenges that restricts underground coal mines
From the deformation law of the three zones of MTR 1513, the mining influence r coal-pillar facing mining in isolated island working face under alternate mining of wide and of adjacent working face on roadway rockofranged from 110 m adva narrow working faces, this paper studies and findssurrounding the characteristics zoning differential to 175 m delayed, whichrock wasstress closeand to deformation the mining of influence range of thedriving previous ana distribution of surrounding the gob-side roadway with small pillar facing mining in displacement the special isolated island working
SolidBased coalon side, and this, the roadway was divided into several zones, for different zones, the zoning control pillar side were 43 mm, 54 mm, and 72 mm, respectively, before being influenced b cooperative control technology of pressure relief and anchorage was proposed, and an vanced mining, which indicated that the anchorage support technology proposed in industrial test was carried out
Summary
The gob-side roadway in an isolated island working face is a typical representative of a strong mining roadway [1], whose surrounding rock control problem is one of the major technical challenges that restricts underground coal mines. Dou et al [4] divided the overlying strata spatial structure into three types, which are “OX” type, “F” type, and “T” type, according to the different boundary states of overlying strata on working surfaces They studied the evolution characteristics of “OX-F-T” type, that is, the “OX” type structure formed by roof “O-X” type fracture is the basic form of overlying strata. At this time, in the boundary condition of adjacent working faces, the “OX” type structure on one side forms the “F” type overlying strata structure, and the “OX” type structure on both sides forms the “T” type overlying strata structure [4]. Jiang et al put forward the calculation formula of abutment pressure and an instability analysis method of coal body in the isolated island working face
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