高压水射流冲击下热岩流体演化与破碎特征

IF 11.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology Pub Date : 2025-03-01 DOI:10.1016/j.ijmst.2025.02.004

Jianming Shangguan, Zhaolong Ge, Qinglin Deng, Yuhuai Cui, Zhi Yao

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引用次数: 0

摘要

在高压水射流辅助破碎深部地下岩石工程的应用中，岩石温度对射流作用下岩石破碎过程的影响机制尚不清楚。为此，对射流冲击过程中流体演化特征和岩石破裂行为进行了研究。结果表明：高温岩石射流破碎过程可分为初始流固接触阶段、剧烈热交换阶段、射孔破裂阶段和裂纹扩展穿透阶段四个阶段；随着岩石温度的升高，射流反射角和冲击面完全冷却所需时间显著减小，裂纹数量和裂纹扩展速度显著增加，岩石破碎临界时间缩短达34.5%。数值模拟结果表明，在射流冲击作用下，400℃花岗岩的中心温度在0.7 s内迅速从390℃下降到260℃。此外，建立了考虑热岩分阶段破碎的临界温度和临界热流密度预测模型。这些研究结果为指导水射流技术辅助的深部热岩开挖工程提供了有价值的见解。

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Fluid evolution and fragmentation characteristics under high pressure water jet impact on thermal rock

In the application of high-pressure water jet assisted breaking of deep underground rock engineering, the influence mechanism of rock temperature on the rock fragmentation process under jet action is still unclear. Therefore, the fluid evolution characteristics and rock fracture behavior during jet impingement were studied. The results indicate that the breaking process of high-temperature rock by jet impact can be divided into four stages: initial fluid-solid contact stage, intense thermal exchange stage, perforation and fracturing stage, and crack propagation and penetration stage. With the increase of rock temperature, the jet reflection angles and the time required for complete cooling of the impact surface significantly decrease, while the number of cracks and crack propagation rate significantly increase, and the rock breaking critical time is shortened by up to 34.5%. Based on numerical simulation results, it was found that the center temperature of granite at 400 °C rapidly decreased from 390 to 260 °C within 0.7 s under jet impact. In addition, a critical temperature and critical heat flux prediction model considering the staged breaking of hot rocks was established. These findings provide valuable insights to guide the water jet technology assisted deep ground hot rock excavation project.

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来源期刊

International Journal of Mining Science and Technology Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology

CiteScore

19.10

自引率

11.90%

发文量

2541

审稿时长

44 days

期刊介绍： The International Journal of Mining Science and Technology, founded in 1990 as the Journal of China University of Mining and Technology, is a monthly English-language journal. It publishes original research papers and high-quality reviews that explore the latest advancements in theories, methodologies, and applications within the realm of mining sciences and technologies. The journal serves as an international exchange forum for readers and authors worldwide involved in mining sciences and technologies. All papers undergo a peer-review process and meticulous editing by specialists and authorities, with the entire submission-to-publication process conducted electronically.