不同赋存深度煤的物性特征
发布时间:2018-05-22 12:58
本文选题:煤 + 赋存深度 ; 参考:《煤炭学报》2017年08期
【摘要】:浅部矿产资源日益枯竭,深部地下开采将成为常态。因此,对不同赋存深度,尤其是超千米深煤岩开展系统研究具有重要的工程意义。现有研究大多通过改变围压、温度等条件来模拟岩体所处的外在环境,并未采用真实赋存深度样品开展研究,同时忽略了原位岩体初始结构、物质组成和性质的差异。对取自平顶山矿区已组煤层300,600,700,850和1 050 m五个不同深度的煤岩开展系统试验,研究不同赋存深度煤岩成分、细观结构、瓦斯吸附及声学特性。测试结果表明:随着赋存深度增加,煤的组成和结构发生改变,变质程度增大,结构更为致密,瓦斯吸附能力增强,超声波在其内传播发生散射和折射的几率减少,损耗能量降低,纵波波速增大。该成果可为后续开展不同赋存深度煤岩宏观力学特性相关研究提供借鉴。
[Abstract]:The shallow mineral resources are exhausted day by day, the deep underground mining will become the normal. Therefore, it is of great engineering significance to carry out systematic research on different occurrence depth, especially over kilometer depth coal and rock. Most of the existing studies simulate the external environment of the rock mass by changing the confining pressure and temperature, and do not use the real depth samples to carry out the research, while ignoring the difference of the initial structure, material composition and properties of the in-situ rock mass. A systematic test was carried out on five coal rocks with different depths of 300600700850 and 1 050m coal seams in Pingdingshan Mining area. The composition of coal and rock, mesoscopic structure, gas adsorption and acoustical characteristics were studied. The test results show that with the increase of occurrence depth, the composition and structure of coal change, the degree of metamorphism increases, the structure becomes denser, the ability of gas adsorption increases, and the probability of scattering and refraction of ultrasonic wave propagating in the coal decreases. The loss of energy decreases and the velocity of the longitudinal wave increases. The results can be used for reference for further research on macroscopic mechanical properties of coal and rock with different occurrence depth.
【作者单位】: 四川大学水力学与山区河流开发保护国家重点实验室;四川大学水利水电学院;四川大学能源工程安全与灾害力学教育部重点实验室;中国平煤神马集团炼焦煤资源开发及综合利用国家重点实验室;中国平煤神马集团;
【基金】:优秀青年科学基金资助项目(5162200272) 国家重点研发计划资助项目(2016YFC0600702)
【分类号】:P618.11;TQ531.1
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