不同含水率及黏土含量下松软煤体力学特征试验研究

发布时间：2018-05-19 05:59

  本文选题：采矿工程 + 松软煤体　； 参考：《岩石力学与工程学报》2017年S1期

【摘要】：运用自行研制的型煤制样设备,借助RMT 150B岩石力学试验系统对不同含水率及黏土含量下松软煤体的力学特征开展试验研究。结果表明:(1)在试验含水率(1.59%~6.50%)范围内,相同黏土含量下的松软煤体均存在一个临界含水率,在该含水率水平时,煤体的抗压强度最高、弹性模量最大;(2)黏土含量由4.00%增加到19.36%过程中,各含水率下的松软煤体抗压强度和弹性模量均呈先增后减的变化趋势,极高点黏土含量皆在11.68%左右;(3)其他条件相同时,随含水率的增大、黏土含量的增多,松软煤体脆性降低而延性增加,泊松比逐渐增大;(4)松软煤体颗粒间液桥力随含水率的变化是煤体宏观力学行为演化的主要原因,适量的黏土颗粒能够作为胶结物进一步强化煤体。研究成果对松软煤层的安全高效开采具有重要的理论意义和工程应用价值。
[Abstract]:With the help of RMT 150B rock mechanics test system, the mechanical characteristics of soft coal under different moisture content and clay content were studied by using the self-developed briquette sample preparation equipment. The results show that there exists a critical moisture content in soft coal with the same clay content in the range of water content of 1.59 and 6.50), and the compressive strength of the coal is the highest at this water content level. When the content of clay increased from 4.00% to 19.36%, the compressive strength and elastic modulus of soft coal increased first and then decreased, and the clay content at the extreme high point was 11.68% or so. With the increase of water content and clay content, the brittleness of soft coal decreases and the ductility increases. Poisson's ratio increases gradually) the variation of liquid bridge force between particles of soft coal with water content is the main reason for the evolution of macroscopic mechanical behavior of coal. Proper amount of clay particles can be used as cement to further strengthen coal body. The research results have important theoretical significance and engineering application value for safe and efficient mining of soft coal seam.
【作者单位】： 安徽理工大学深部煤矿采动响应与灾害防控安徽省重点实验室;安徽理工大学能源与安全学院;淮南矿业(集团)有限责任公司;
【基金】：国家自然科学基金资助项目(U1361208,51504005) 安徽理工大学深部煤矿采动响应与灾害防控安徽省重点实验室开放基金项目(KLDCMERDPC15105)~~
【分类号】：TD315
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本文编号：1908978