在冲击负载下暴露于酸腐蚀的煤炭的损伤和故障行为研究
Zhaoying Chen1, Wenmei Han2, Xiang Zheng2
1State Key Laboratory of Coal and CBM Co-mining, Jincheng, China.
PloS one
|December 18, 2025
概括
酸性水会削弱煤炭,降低其动态拉伸强度. 较高的撞击速度增加了煤炭的碎片化和强度,但酸性条件加剧了裂的形成.
科学领域:
- 地质技术工程 地质技术工程
- 材料科学 材料科学 材料科学
- 采矿工程 采矿工程 采矿工程
背景情况:
- 深层煤炭开采面临复杂的水文和酸性水腐蚀的挑战.
- 酸性水与岩石的相互作用降低了煤炭的机械性能,增加了采矿风险.
- 爆炸和岩石爆炸的动态负荷进一步威胁到深矿的安全.
研究的目的:
- 调查暴露在酸性水环境中的炭酸煤的动态机械性能.
- 分析在酸性条件下的动态负载下煤的损伤机制和故障模式.
- 为在具有挑战性的地质环境中确保安全的煤炭开采运作提供见解.
主要方法:
- 动态巴西分裂试验在煤样本上使用Split Hopkinson压力棒 (SHPB) 装置进行.
- 使用连续离散合方法和平面关节模型 (FJM) 开发了一个三维SHPB数值模型.
- 分析包括动态机械反应,损伤演变和故障模式.
主要成果:
- 在暴露于酸性溶液后,煤的动力拉伸强度下降 (原煤 > pH 4 > pH 2).
- 增加撞击速度或加载速度对所有样品的线性增强动态拉伸强度,碎片化和消散能量.
- 在相同的撞击速度下,在pH 2的样本中,破裂形成在故障时是最高的,其次是pH 4和原煤.
结论:
- 酸性水显著降低了炭酸煤的动态拉伸强度.
- 冲击速度和加载速度是影响煤炭动态反应和碎片化的关键因素.
- 了解这些影响对于减轻在酸性环境中深层煤矿开采相关的风险至关重要.
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