关于天然石崩柱 (KCP) 填充物在质量外流上的透突变的实验研究
Boyang Zhang1,2, Gang Liu1, Yingchun Li3
1School of Civil Engineering, Henan Polytechnic University, Jiaozuo, 454000, China.
Environmental science and pollution research international
|October 5, 2023
概括
石灰岩崩塌柱 (KCP) 和采矿断层可能导致煤矿水涌入. 由KCP填充损失驱动的透突变是关键,特别是在高孔隙性和大骨折的情况下.
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
- 水文地质学 水文地质学
背景情况:
- 煤矿水涌入是中国北部的一大灾难,通常与石崩柱 (KCP) 和采矿引起的骨折有关.
- 由KCP填充物损失引起的漏突变是与KCP相关的水冲入事件的公认前体.
- 流体路径尺度和KCP填充孔隙对漏突变的影响仍然不太清楚.
研究的目的:
- 调查流体路径尺度和KCP填充孔隙在漏突变中的作用.
- 了解驱动KCP填充物漏突变的机制.
- 确定增加KCP相关水冲入的可能性的条件.
主要方法:
- 透测试对具有不同岩石颗粒大小的天然KCP填充进行了透测试.
- 通过轴向压缩,样品的多孔度控制在14%至26%之间.
- 模拟了流体路径尺度,使用孔径从2.5毫米到12.5毫米的漏板.
主要成果:
- 观察到透突变,导致在特定条件下 (孔径12.5毫米,多孔度26%) 的两倍的透性增强.
- 在漏突变期间,在样本透性和雷诺兹数 (Re) 之间发现了强烈的线性相关性.
- 突变机制涉及KCP填充的结构骨架的突然崩和快速的粒子外流.
结论:
- 当KCP填充物具有较高的孔隙性并且采矿诱导的骨折很发达时,与KCP相关的水冲入更有可能发生.
- 采矿引起的断裂 (流体路径) 的规模显著影响漏突变.
- 了解KCP填充孔隙和断裂的发展对于预测和减轻水冲入风险至关重要.
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