Modeling and control method of coal instability around cavity under water jet impact loading

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology Pub Date : 2025-03-14 DOI:10.1016/j.tust.2025.106574

Man Yuan , Shuaibin Sun , Yingke Liu , Tengrui Yang , Chao Li , Yue Niu , Xiaojiang Wen

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Abstract

In the process of Hydraulic jet cavity completion (HJCC), the elastic energy and gas expansion energy endowed in the coal around cavity can be instantly released under the strong disturbance of the water jet and cause dynamic disasters. Currently, the influence mechanisms of external disturbance and gas desorption on the cavity instability are unclear, and the technical methods to ensure cavity stability cannot be obtained. In this paper, a cavity instability model under water jet impact loading was derived, which considered both the dynamic stress field and the gas pressure field of the coal, and the control method was given by studying the influence mechanisms of the jet (or coal seam) parameters on the energy leading to instability. The results show that the jet pressure and ground stress affect the elastic energy by determining the effective stress distribution within the energy release zone. The initial gas pressure affects the gas expansion energy by determining the ratio of free to adsorbed gas pressure for the same desorption time. Besides, the jet pressure determines the dominant energy of cavity instability. Finally, the guidelines for “Pressurization by step” were proposed to ensure cavity stability. The results can ensure the safety of HJCC’s operation.

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喷水冲击加载下空腔周围煤炭不稳定性的建模与控制方法

在水力喷射成腔（HJCC）过程中，煤腔周围蕴藏的弹性能和瓦斯膨胀能会在水射流的强烈扰动下瞬间释放，造成动力灾害。目前，外部扰动和瓦斯解吸对空腔失稳的影响机理尚不清楚，无法获得保证空腔稳定的技术方法。本文推导了水射流冲击载荷下空腔失稳模型，同时考虑了煤的动应力场和瓦斯压力场，通过研究水射流（或煤层）参数对导致失稳能量的影响机理，给出了控制方法。结果表明，射流压力和地应力通过决定能量释放区内的有效应力分布来影响弹性能量。初始瓦斯压力决定了相同解吸时间内自由瓦斯压力与吸附瓦斯压力之比，从而影响瓦斯膨胀能量。此外，喷射压力还决定了空腔不稳定性的主导能量。最后，提出了 "分步加压 "准则，以确保空腔的稳定性。这些结果可以确保 HJCC 的运行安全。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Tunnelling and Underground Space Technology 工程技术-工程：土木

CiteScore

11.90

自引率

18.80%

发文量

454

审稿时长

10.8 months

期刊介绍： Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.