底板内次生断层采动活化影响作用研究

发布时间：2018-03-28 09:21

本文选题：主断层　切入点：次生断层　出处：《山东科技大学》2017年硕士论文

【摘要】：论文针对次生断层影响下主断层活化规律以及断层煤柱留设问题进行研究,运用数值模拟的方法和正交实验,由主断层倾角、次生断层倾角、主次断层间距、次生断层上端与煤层间距四种因素入手,研究了次生断层对主断层应力变化、活化程度、煤柱宽度的影响规律,论文对底板突水的防治措施进行了总结,主要结论如下:1)主次断层间距的增大,主断层法向应力、切向应力峰值逐渐变小,并且逐渐向深部移动,次生断层对主断层应力及活化的影响程度和影响范围也逐渐变小,须留设的煤柱宽度先增大后减小;2)主断层倾角的增大,次生断层对主断层上靠近煤层处法向应力、切向应力的影响程度减小,对于其他位置的影响程度相差不大,次生断层对主断层30-60m处活化的影响程度变化不大,整体来看,次生断层对主断层活化的影响程度变小,需留设的煤柱宽度均随之减小,次生断层对煤柱宽度的影响程度随之减小;3)次生断层的倾角减小,次生断层对主断层法向应力、切向应力的影响范围变化不大,次生断层对主断层法向应力、切向应力的影响程度加大,次生断层对主断层活化的影响逐渐增大,随着次生断层倾角的增加,所需留设的煤柱宽度也随之增加,当次生断层倾角大于150′时,随着次生断层倾角的增加,须留设的煤柱宽度变化不大;4)次生断层与煤层底板之间距离的增大,法向应力、切向应力峰值逐渐向深部移动,次生断层对主断层法向应力、切向应力的影响范围逐渐向深部移动,次生断层对主断层法向应力、切向应力的影响程度也越来越小,次生断层对主断层的活化的影响程度呈先增大后减小的趋势,须留设的煤柱宽度先增大后减小;5)以上四种因素对煤柱宽度的影响程度排序是:次生断层倾角主断层倾角次生断层上端与煤层间距主次断层间距。研究成果对含次生断层情况下底板断层活化突水的防治具有一定的借鉴意义。
[Abstract]:In this paper, the activation law of main fault and the problem of coal pillar retention under the influence of secondary fault are studied. By means of numerical simulation and orthogonal experiment, the main fault dip angle, secondary fault dip angle and primary and secondary fault spacing are studied. Starting with four factors of the distance between the upper end of the secondary fault and the coal seam, the influence of secondary fault on the main fault stress change, activation degree and coal pillar width is studied, and the prevention measures of water inrush from the floor are summarized in this paper. The main conclusions are as follows: (1) with the increase of the distance between primary and secondary faults, the peak value of normal stress and tangential stress of the main fault becomes smaller, and gradually moves to the deep, and the influence of secondary fault on the stress and activation of the main fault becomes smaller, and the influence of the secondary fault on the stress and activation of the main fault becomes smaller. The width of the coal pillar needed to be set up increases first and then decreases the slope angle of the main fault. The influence of secondary fault on the normal stress and tangential stress near the coal seam on the main fault decreases, but the influence degree on other positions is not significant. The influence of secondary faults on the activation of main faults at 30-60 m has little change. On the whole, the influence of secondary faults on the activation of main faults becomes smaller, and the width of coal pillars that need to be set up decreases accordingly. The influence of secondary fault on the width of coal pillar decreases accordingly) the dip angle of secondary fault decreases, the influence range of secondary fault on normal stress and tangential stress of main fault changes little, and the secondary fault affects normal stress of main fault. The influence of the tangential stress on the activation of the main fault increases gradually, and with the increase of the dip angle of the secondary fault, the width of the coal pillar needed to be set up increases, and when the dip angle of the secondary fault is greater than 150', With the increase of dip angle of secondary fault, the width of coal pillar that needs to be set up is not changed much.) the distance between secondary fault and coal seam floor increases, the normal stress and tangential stress peak gradually move deep, and the secondary fault moves to the normal stress of main fault. The influence of tangential stress on the normal stress and tangential stress of the main fault is becoming smaller and smaller, and the influence of secondary fault on the activation of the main fault is increasing first and then decreasing. The influence degree of the above four factors on the coal pillar width is as follows: secondary fault dip angle main fault dip angle upper end of secondary fault and coal seam distance between main fault and secondary fault. The prevention and treatment of activated water inrush of floor fault under secondary fault has certain reference significance.
【学位授予单位】：山东科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD822.3;TD163.1

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