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微波循环作用下饱水煤体损伤及渗流特性研究

Study on the damage and seepage characteristics of water-saturated coal by microwave cycling.

作者信息

Qi Xiaohan, Liu Xiaodong, Ma Heng, Liu Zhonghua, Xie Wenkun, Zhang Ying, Zhao Xinwei

机构信息

College of Safety Science and Engineering, Liaoning Technical University, Huludao, 125105, Liaoning, China.

Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education, Liaoning Technical University, Huludao, 125105, Liaoning, China.

出版信息

Sci Rep. 2024 Jul 30;14(1):17514. doi: 10.1038/s41598-024-68506-4.

DOI:10.1038/s41598-024-68506-4
PMID:39079953
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11289454/
Abstract

To investigate the extent of damage and seepage characteristics of water-saturated coal samples after subjecting them to microwave cycling. The microwave equipment was used to process the coal samples by microwave cycling. The non-contact digital image processing technology and acoustic emission system were used to carry out the triaxial loading experimental study of the coal samples to obtain the mechanical parameter characteristics, energy evolution pattern, acoustic emission information and permeability characteristics of coal samples under different microwave cycle times. The results of the study show that: With the increase in the number of microwave cycles, dense grid-loaded cracks gradually appeared on the surface of the coal samples, the triaxial partial stresses of the coal samples decreased, and the strains also decreased, and the modulus of elasticity and Poisson's ratio also decreased; In the densification stage stage, the dissipated energy is higher than the elastic energy, and as the elastic stage proceeds, the elastic energy gradually reverses to exceed the dissipated energy, and the total energy and elastic energy of the coal samples decrease with the increase in the number of cycles, and the dissipated energy rises; Coal samples produce a large number of fissures due to the increase in the number of microwave cycles, the more frequent the fissure activity during the loading process, the acoustic emission amplitude and ringing count scattering points all become dense with the increase in the number of cycles, and the data increase; Initial permeability, destructive permeability and average permeability were all increased, microwave treatment has a better effect of permeability enhancement, the permeability of the treated coal samples was changed from low permeability to medium permeability, and the permeability enhancement was the largest in 6 cycles, and the permeability was increased by 7.18 times. This article explores the damage condition of water-saturated coal samples under microwave cycling treatment. Then, it explores the effect of microwave cycling on the permeability enhancement of the coal body, which provides a new method for exploring the gas permeability enhancement and extraction of low-permeability coal samples underground.

摘要

为研究饱水煤样在微波循环作用后的损伤程度及渗流特性。采用微波设备对煤样进行微波循环处理。利用非接触式数字图像处理技术和声发射系统对煤样进行三轴加载试验研究，以获取不同微波循环次数下煤样的力学参数特性、能量演化规律、声发射信息及渗透特性。研究结果表明：随着微波循环次数的增加，煤样表面逐渐出现密集的网格状加载裂纹，煤样的三轴偏应力减小，应变也减小，弹性模量和泊松比也减小；在致密化阶段，耗散能高于弹性能，随着弹性阶段的进行，弹性能逐渐反超耗散能，煤样的总能量和弹性能随循环次数增加而减小，耗散能上升；煤样因微波循环次数增加产生大量裂隙，加载过程中裂隙活动越频繁，声发射幅度和振铃计数散射点均随循环次数增加而变得密集，数据增多；初始渗透率、破坏渗透率和平均渗透率均增大，微波处理具有较好的增透效果，处理后的煤样渗透率由低渗透率变为中渗透率，在6次循环时增透效果最大，渗透率提高了7.18倍。本文探究了饱水煤样在微波循环处理下的损伤情况。进而探究了微波循环对煤体增透的影响，为探索井下低渗透煤样的瓦斯增透及抽采提供了一种新方法。

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