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Study on Rockburst Hazard under Deep Large Braid Fully Mechanized Mining

Author: KongLingFeng
Tutor: PanLiYou
School: Shandong University of Science and Technology
Course: Engineering Mechanics
Keywords: Deep strip mining Mechanical model Rockburst danger Abutment pressure Numerical Simulation
CLC: TD324
Type: Master's thesis
Year: 2008
Downloads: 56
Quote: 0
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Abstract


Rock stress-strain curve that presented with progressive destruction and brittle failure of two forms of coal and rock in the peak intensity, and easily lead to brittle failure occurs rockburst. About the theory of elastic-plastic mechanics, rock mechanics and mining pressure mechanical model of deep mining under the roof structure, theoretical analysis, that the impact of the failure mechanism and general stope and islands of the stope under general stope old items easy to induce Face of initial pressure and cycle pressure during the high-risk period for face rockburst occurred; island stope roof load and the goaf span reached the limits of state rockburst. Application the common discrete element program UDEC3.1, simulation analysis of deep large striped face toward the side of coal pillar bearing pressure, obtained support pressure distribution law, further revealed the law of energy release of coal and rock and rock burst dangerous region division. Strip mining of the deep impact of coal pillar recovery risk analysis for conventional coal face, the impact may occur pressure divided into the roof fracture type, coal bulge type three types of compression type and floor; strip The face of the impact of dangerous mainly located in the support pressure development in the second stage, the impact mainly in the form of coal body type or roof; roadway impact dangerous mainly located along the roadway sideways and face toward the high bearing pressure superimposed regional roadway Shun slot outstanding; impact form of help coal coal pillar with the coal pillar size decreases, supporting pressure gradually from low stress saddle-type distribution to high stress arch distribution impact risk gradually increasing. When the coal pillar size is too small, the entire coal pillar plastic damage does not occur shock hazard, but the entire coal pillar instability is likely to occur. Large strip coal pillar normally does not occur in goaf Coal columnar rockburst, shock hazard occurs mainly along the the coal pillar strike and the lateral bearing pressure under the influence of mining the superimposed area roadway Shun slot. In addition, the coal pillar roadway layout in low stress areas or shock hazard gob roadway will greatly reduce the roadway. Finally the results of this study, to mine for Liangbaosi 3107 with a face impact pressure risk analysis and evaluation, and propose appropriate control measures to effectively eliminate the face rockburst danger good , perfect deep strip mechanized mining rockburst risk assessment theory and method.

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CLC: > Industrial Technology > Mining Engineering > Mine the pressure and support > Rock pressure and rock movement > Rockburst
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