在正常断层中悬挂墙和脚墙的气体透性特性,基于真三轴实验系统实验系统
Weihua Song1, Luo Yan2, Huice Jiao1
1College of Mining, Liaoning Technical University, Fuxin, Liaoning, China.
Scientific reports
|July 2, 2025
概括
深矿中的正常断层会影响煤层的透性,这对于煤炭和天然气爆发至关重要. 这项研究显示,挂墙煤的透率低于脚墙煤,指导了有针对性的气体控制策略.
科学领域:
- 地质地质地质地质地质地
- 采矿工程 采矿工程 采矿工程
- 岩石力学 岩石力学 岩石力学
背景情况:
- 正常的断层结构在深层采矿中显著影响煤层透性.
- 煤炭和天然气喷发在这些环境中是一个主要问题.
- 了解故障相关的透性对于矿山安全至关重要.
研究的目的:
- 调查与正常断层相关的煤层中的气体泄漏和液压压裂情况.
- 分析悬挂墙和脚墙中煤层透性的演变.
- 建议对受故障影响的煤层采取加强的气体控制措施.
主要方法:
- 使用了一个真正的三轴多功能物理模拟系统.
- 在-400米,-600米和-800米的深度进行了气体泄漏和液压压裂实验.
- 在不同限制压力下检查的透性变化.
主要成果:
- 透性与限制压力呈负指数关系.
- 悬挂墙煤通常比脚墙煤具有较低的透性,该比率随深度增加 (2.96到10.2倍).
- 水力压裂显著增加了透性,特别是在脚墙上,但放大因子随着深度的增加而下降.
结论:
- 挂墙和脚墙煤炭之间的透率差异随着深度的增加而增加.
- 基于故障特征和透性模式,提出了针对性气体控制策略.
- 该研究提供了关于在受故障影响的煤层中提取气体和防止爆发的指导.
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