基于相似模拟和地质力学模型试验的突出装置研制及应用

发布时间：2018-02-25 07:11

本文关键词： 煤与瓦斯突出相似模拟地质构造石门揭煤突出装置　出处：《岩土力学》2015年03期 　论文类型：期刊论文

【摘要】：国内外学者对煤与瓦斯突出过程及机制进行了大量的研究,但使用的均是型煤试验,很少涉及地质构造对突出的影响,而且数据监测均未深入到煤体内部。基于相似模拟试验思想和地质力学模型试验新思路,在实验室搭建了综合考虑地应力、瓦斯压力及煤体结构的大型石门揭煤的煤与瓦斯突出试验平台。该试验平台包括试验箱体和反力架、液压加载系统、密封系统、试验监测系统;设计了线充气和面充气系统,用来模拟煤层的瓦斯赋存差异。同时,利用该试验平台进行了石门揭构造软煤的相似模拟试验,研究了石门揭构造软煤过程中煤岩应力和位移的变化规律,以及突出过程中煤层内瓦斯压力和声发射的变化规律。结果表明,在巷道开挖过程中,掘进工作面前方存在明显的应力集中,且越靠近构造软煤应力集中现象越明显;突出发生的瞬间,在突出点附近的位移产生了突变;在突出发生前,声发射信号有一次降低;掘进工作面前方煤岩体应力释放,煤体裂隙增大,为瓦斯的快速放散提供了条件。
[Abstract]:Scholars at home and abroad have done a great deal of research on the process and mechanism of coal and gas outburst, but they use briquette tests, and rarely involve the influence of geological structure on outburst. And the data monitoring is not deep into the coal body. Based on the idea of similar simulation test and the new idea of geomechanical model test, a comprehensive consideration of in-situ stress is built in the laboratory. The test platform for coal and gas outburst of large Shimen uncovering coal with gas pressure and coal structure. The test platform includes test box and counterforce frame, hydraulic loading system, sealing system, test monitoring system, line inflating system and surface inflating system, It is used to simulate the difference of gas occurrence in coal seams. At the same time, the similar simulation tests of soft coal in Shimen structure are carried out by using the test platform, and the variation law of stress and displacement of coal and rock during the process of shimen structure soft coal is studied. The results show that the stress concentration in the front of tunneling face is obvious, and the stress concentration phenomenon is more obvious when the coal is closer to the structural soft coal. At the moment of outburst, the displacement near the outburst point has a sudden change; before the outburst occurs, the acoustic emission signal decreases once; the stress release of the coal and rock mass in front of the heading face and the enlargement of the coal body fissure provide the condition for the rapid release of gas.
【作者单位】：安徽理工大学煤矿安全高效开采省部共建教育部重点实验室;安徽理工大学能源与安全学院;
【基金】：国家自然科学基金资助项目(No.51474009) 安徽理工大学引进人才科研启动基金(No.ZY027) 安徽理工大学青年教师科学研究基金(No.12675)
【分类号】：TD713

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