Advanced modeling of seepage dynamics and control strategies in thick coal seams under high-confined aquifer conditions: A case study

IF 6.2 2区 工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY alexandria engineering journal Pub Date : 2024-10-26 DOI:10.1016/j.aej.2024.09.069
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Abstract

The hydraulic behavior of the connection between the floor failure area and the aquifer water-conductive zone is considered to be the root cause of mine water inrush disasters. Therefore, unraveling the floor failure mechanism is particularly important for safe coal mining above the high-confined aquifer. This paper estimates the depth of the baseplate failure to be 18.4–27.3 m by combining network parallel electrical methods with drilling visualization technology. The FLAC3D-based numerical model considering the strain hardening of caved rock was established with rigorous calibration and verification. The results showed that the depth of damage to the floor is 23.1 m, and the dominating floor failure mechanism is shear failure caused by the vertical stress exceeding the rock bearing capacity. Moreover, the stress recovery process of the baseplate does not alter the failure morphology of the baseplate. Based on the above research findings, the in-situ floor control technique of the working face No. 4305 is proposed and practiced in the field. Field measurements show that floor control performance is satisfactory with water inflow in the goaf being roughly stable at 50 m3/h. Our results can provide useful reference for safe mining above confined aquifer and prevention and mitigation of water-related hazards.
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高封闭含水层条件下厚煤层渗流动力学和控制策略的高级建模:案例研究
底板破坏区与含水层导水带之间连接的水力行为被认为是矿井涌水灾害的根本原因。因此,揭示底板破坏机理对高封闭含水层上的煤矿安全开采尤为重要。本文通过将网络并行电法与钻孔可视化技术相结合,估算出底板破坏深度为 18.4-27.3 米。建立了基于 FLAC3D 的数值模型,考虑了空洞岩石的应变硬化,并进行了严格的校核和验证。结果表明,底板破坏深度为 23.1 米,主要的底板破坏机理是垂直应力超过岩石承载力导致的剪切破坏。此外,底板的应力恢复过程不会改变底板的破坏形态。根据上述研究成果,提出了 4305 号工作面的原位底板控制技术,并在现场进行了实践。现场测量结果表明,底板控制性能令人满意,巷道进水量基本稳定在 50 立方米/小时。我们的研究结果可为在承压含水层上安全采矿以及预防和减轻与水有关的危害提供有益的参考。
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来源期刊
alexandria engineering journal
alexandria engineering journal Engineering-General Engineering
CiteScore
11.20
自引率
4.40%
发文量
1015
审稿时长
43 days
期刊介绍: Alexandria Engineering Journal is an international journal devoted to publishing high quality papers in the field of engineering and applied science. Alexandria Engineering Journal is cited in the Engineering Information Services (EIS) and the Chemical Abstracts (CA). The papers published in Alexandria Engineering Journal are grouped into five sections, according to the following classification: • Mechanical, Production, Marine and Textile Engineering • Electrical Engineering, Computer Science and Nuclear Engineering • Civil and Architecture Engineering • Chemical Engineering and Applied Sciences • Environmental Engineering
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