压力水浸泡下煤岩抗拉特性试验研究

doi:10.13722/j.cnki.jrme.2022.0662

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摘要基于自主研发的煤岩压力水浸泡试验装置，结合扫描电子显微镜和XTDIC三维全场应变测量系统，开展干燥及0，3和5 MPa压力水浸泡下(浸泡时长为10 d)4组煤样的巴西劈裂试验，研究压力水浸泡下煤岩抗拉特性。结果表明：随着浸水压力增大，煤样单轴抗拉强度和峰后轴向应力递减率均逐渐降低，同时煤样塑性破坏增强。加载初期，煤样最大主应变场分布几乎无规律可循，随着浸水压力增大，煤样应变等势线逐渐密集；煤样首先在原生宏观裂纹处产生应力集中，形成变形局部化带，随着轴向应力加载至应力峰值，煤样中部生成宏观主控裂纹，应变等势线梯度增大，并逐渐向主控宏观拉伸裂纹变形局部化带区域收缩靠拢；同时，煤样变形局部化带位移错动量演化与局部化带发育、扩展与贯通有关，应力峰值处变形局部化带位移错动量随着浸水压力增大而增大。浸水压力的增大加剧水–煤岩作用，破坏煤样初始储能结构，其峰前能量储存能力逐渐减小，对应至试验机加载到煤样上的机械能呈递减趋势，与干燥煤样相比，0，3和5 MPa压力水浸泡下平均机械能分别减小了29.93%，44.90%和57.14%。随着浸水压力增大，煤样破裂断口形貌由相对平整向“蜂窝”状转变，测得其平均孔隙率、孔隙最大面积和概率熵逐渐增大，说明煤样内部损伤加剧，进而导致其单轴抗拉强度减小，抗拉特性劣化效应增强。上述研究成果对煤矿防隔水煤(岩)柱合理留设及其稳定性保障等具有重要的意义。

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	尹大伟1
	丁屹松1
	汪锋1
	江宁1
	谭毅2
	李宗蓄1

关键词 ：岩石力学, 水&ndash, 煤岩作用, 抗拉特性, 变形局部化带, 应变等势线, 概率熵

Abstract：Based on the independently developed coal(rock) pressure water immersion test device，combined with Scanning Electron Microscope and XTDIC 3 D full-field strain measurement system，we carried out the Brazilian split test of four groups of coal samples under 0，3 and 5 MPa pressure water immersion(immersion time is 10 d)，and studied the tensile characteristics of coal samples under pressure water immersion. The results show that the uniaxial tensile strength and post-peak axial stress decline trend with the increase of water immersion pressure，and the plastic failure of coal samples increases at the same time. At the early stage of loading，the distribution of the maximum principal strain field of the coal sample is almost irregular. With the increase of the water immersion pressure，the strain isometric lines of the coal sample strain gradually become dense. The coal sample first produces stress concentration at the original macroscopic crack，forming the deformation localization zone. With the axial stress loads to the peak stress，the macro master control crack is generated in the middle of the coal sample，and the strain isometric line gradient increases，and gradually close to the control of the main macro tensile crack deformation localization zone area contraction. At the same time，the evolution of displacement mismomentum in the deformation localization zone of coal samples is related to the development，expansion and penetration of the localization zone，and the displacement mismomentum in the deformation localization zone at the stress peak increases with the increase of the water-immersion pressure. The increase of water immersion pressure intensifies the water-coal rock action，destroys the initial energy storage structure of coal samples，its pre-peak energy storage capacity gradually decreased，and the mechanical energy loaded to the coal samples by the test machine decreases. Compared with the dry coal samples，the average mechanical energy under 0，3 and 5 MPa pressure water immersion decreases by 29.93%，44.90% and 57.14%，respectively. As the immersion pressure increases，coal fracture morphology from relatively flat to "honeycomb" shape，measured its average porosity，pore maximum area and probability entropy，indicating that the internal damage of coal samples increased，which leads to its uniaxial tensile strength，and the tensile characteristic deterioration effect enhancement. The above research results are of great significance to the reasonable retention and stability guarantee of coal(rock) column in coal mine.

Key words： rock mechanics water-coal rock action tensile characteristic deformation localization zone strain isometric line probability entropy

引用本文:

尹大伟1，丁屹松1，汪锋1，江宁1，谭毅2，李宗蓄1. 压力水浸泡下煤岩抗拉特性试验研究[J]. 岩石力学与工程学报, 2023, 42(S1): 3178-3191.
YIN Dawei1，DING Yisong1，WANG Feng1，JIANG Ning1，TAN Yi2，LI Zongxu1. Experimental study on tensile properties and deterioration mechanism of coal samples under pressure water immersion. , 2023, 42(S1): 3178-3191.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0662 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS1/3178

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