Abstract
High-intensity mining effect induced by long working face mining causes dynamic disasters to safe and efficient coal mining. For the purpose of in-depth study of the movement law of earth’s surface on ultra-long working face, this paperused to build a numerical model, analyzes the law of roof-to-floor strata behaviors in coal bed during mining, and studies the weakening of roof-to-floor parameters in coal bed, bearing pressure and the law of roof caving and rock strata movement. Analyzes the face length effect resulted from the difference in face lengths. It has been recognized that the sphere of influence of bearing pressure changes from small to large and then to small, and changes in distribution of arch bottom and arch height at the plastic failure zone are further intensified over advancing of the working face, moreover, the movement of rock strata is subject to the cumulative influence of the advancing direction of the working face and the face length effect. The above-mentioned research results can serve as a theoretical basis for practical engineering.
Highlights
Double-length working face mainly refers to the working face with ultra-long advance and super face length
For the purpose of in-depth study of the law of earth’s surface movement on ultra-long working face, this paper, with FLAC3D used to build a numerical model of ultra-long working face, analyzes the law of roof-to-floor strata behaviors in coal bed during mining, and studies the weakening of roof-to-floor parameters in coal bed, bearing pressure and the law of roof caving and rock strata movement; Analyzes the face length effect resulted from the difference in face lengths
It has been recognized that the sphere of influence of bearing pressure changes from small to large and to small, and changes in distribution of arch bottom and arch height at the plastic failure zone are further intensified over advancing of the working face, the movement of rock strata is subject to the cumulative influence of the advancing direction of the working face and the face length effect
Summary
Double-length working face mainly refers to the working face with ultra-long advance and super face length. According to the theory of clamped beam and cantilever beam, Jin (2019) by means of 3DEC numerical simulation and on-site measurement, analyzed the behavior law of underground pressure after ultra-long fully mechanized caving face in ultra-thick coal seams is mined. In view of the problem, it is necessary to study ultra-long working face and analyze the distribution law of roof and floor support pressure induced by face length effect, the height of caving zone and the law of rock movement. For the purpose of in-depth study of the law of earth’s surface movement on ultra-long working face, this paper, with FLAC3D (numerical simulation software) used to build a numerical model of ultra-long working face, analyzes the law of roof-to-floor strata behaviors in coal bed during mining, and studies the weakening of roof-to-floor parameters in coal bed, bearing pressure and the law of roof caving and rock strata movement.
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