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不同推进方式下断层工作面围岩应力演化研究

Study on Stress Evolution of Surrounding Rock in Fault Face under Different Propulsion Methods
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摘要 基于正断层采用FLAC^(3D)研究了上下盘向断层不同推进方式开采下断层影响区工作面围岩应力演化规律,结果表明:上盘开采时工作面前方煤体垂直支撑应力峰值大于下盘工作面,不论是上盘向断层推进开采还是下盘向断层推进开采,随着工作面逐渐接近断层,断层前方煤体的垂直支撑应力先增大后减小,主要是因为煤柱较宽时能够承载工作面前方的垂直支撑应力叠加,但是当煤柱宽度减小到一定程度时,煤柱发生整体塑性破坏使得承载能力降低,同时随着工作面逐渐向断层推进,工作面端头两侧煤体的垂直支撑应力逐渐增大,成为主要承载区。 The FLAC3 Dbased on normal fault was used to study the effect of different propulsion modes of upper and lower disk faults on the stress evolution law of fault surrounding rock and the influence of surrounding rock stress on fault under mining conditions,the study found: face mining mining face ahead of the peak stress is slightly smaller than the lower face of the work surface,but the scope of the fault slightly wider than the lower plate; whether the plate is pushed to the fault or the plate is pushed to the fault,as the working face gradually approaches the fault,the advance support stress in front of the fault first increases and then decreases,mainly because the coal pillar can bear the weight of the working face however,when the width of coal pillar is reduced to a certain extent,the overall plastic failure of coal pillar reduces the carrying capacity,and at the same time,the supporting stress of the coal body on both ends of the working face gradually increases and becomes the main bearing area.
作者 李小裕 丁楠 LI Xiao-yu;DING Nan(Construction of National Key Laboratory Nurture Base by Ministry of Mines Disaster Prevention and Control,Shandong University of Science and Technology,Taian 271000,China)
出处 《煤》 2018年第10期1-3,共3页 Coal
基金 国家自然科学基金面上资助项目(51374139 51574155)
关键词 正断层 推进方式 围岩应力 数值模拟 normal fault promote the way surrounding rock stress numerical sinmlation
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