湿度对煤炭机械和物理性能的影响:一个单轴压缩研究
Song Li1,2, Dazhen Tang1,2, Peng Feng3,4
1School of Energy Resources, China University of Geosciences (Beijing), Beijing, 100083, China.
Scientific reports
|November 10, 2024
概括
了解煤矿库的特性是煤床甲 (CBM) 开发的关键. 这项研究揭示了压力和湿度如何影响煤炭.
科学领域:
- 地质技术工程 地质技术工程
- 石油工程是石油工程中的一个.
- 材料科学 是一种材料科学.
背景情况:
- 精确估计煤矿库的机械和物理性能对于成功的煤床甲 (CBM) 勘探和开发至关重要.
- 煤炭储库表现出独特的应激敏感行为,与传统的砂岩储库不同.
研究的目的:
- 研究单轴应力和不同湿度条件对低级和高级煤样品的机械和物理性能的影响.
- 阐明压力,水分含量和煤炭多孔性和透性的变化之间的关系.
主要方法:
- 在受控湿度条件下,对煤样进行了单轴压缩试验.
- 轴应力应用于高达2.8MPa的轴向应力,以监测轴向应力,Young的模量和Poisson的比率的变化.
- 测量了孔隙性和透性,以量化它们对应用于应力和水分含量的反应.
主要成果:
- 轴应变迅速增加,然后在负载下减速,扬模量在稳定之前线性增加. 波桑比率保持相对不变或增加.
- 孔隙性和透性显示,随着压力增加,呈指数级下降.
- 湿度会影响机械性能:低和度会导致凝固效应,而高和度会导致软化. 透性和透性最初增加,然后随着水和度的增加而下降.
- 在含水煤的应力卸载过程中观察到显著的应力歇斯底里,特别是在低级煤中.
结论:
- 煤炭的机械和物理性能对应加压和水分含量都非常敏感.
- 水含量显著改变煤炭对压力的反应,影响其变形,弹性,多孔性和透性.
- 了解这些依赖压力和水分的行为,包括应变歇斯底里,对于有效的CBM水库表征和管理至关重要.
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