Experimental study on the dynamic evolution of rock pore structure in real-time monitoring based on nuclear magnetic resonance

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters Pub Date : 2024-06-24 DOI:10.1016/j.matlet.2024.136905

Xiangxi Meng , Xianghai Lv , Weitao Liu , Mingguang Zhang

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Abstract

The rock structure determines the stability and reliability of underground engineering. Great achievements have been made in the study of rock structural damage, but there are few studies on real-time monitoring of rock structural changes under different increasing and unloading decreasing pressures. In this paper, the dynamic evolution rule of pore structure in rock under the combined action of water pressure and different confining pressure of increasing and decreasing is monitored by NMR technique. The porosity and permeability of rock under different confining pressures are consistent. The increase of confining pressure leads to the closure of pores, which leads to the decrease of porosity and permeability, but the amplitude and time of change are different. During the process of decreasing confining pressure, the T₂ spectral curve, porosity and permeability of the rock did not fully recover due to the reduction of confining pressure, indicating that plastic deformation occurs inside the rock at this time. The mathematical relationship between porosity and permeability is established, and the permeability of rock is not only related to the size of porosity, but also closely related to the pore structure of rock.

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基于核磁共振实时监测岩石孔隙结构动态演变的实验研究

岩石结构决定了地下工程的稳定性和可靠性。目前对岩石结构破坏的研究已经取得了很大的成果，但对不同增减载压力作用下岩石结构变化的实时监测研究还很少。本文利用核磁共振技术监测了水压力和不同增减荷载约束压力共同作用下岩石孔隙结构的动态演化规律。不同约束压力下岩石的孔隙度和渗透率是一致的。封闭压力的增加会导致孔隙的封闭，从而导致孔隙度和渗透率的降低，但变化的幅度和时间不同。在圈闭压力降低的过程中，岩石的 T2 频谱曲线、孔隙度和渗透率并没有因为圈闭压力的降低而完全恢复，说明此时岩石内部发生了塑性变形。建立了孔隙度与渗透率之间的数学关系，岩石的渗透率不仅与孔隙度的大小有关，还与岩石的孔隙结构密切相关。

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

Materials Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

期刊介绍： Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials. Contributions include, but are not limited to, a variety of topics such as: • Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors • Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart • Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction • Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots. • Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing. • Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic • Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive

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