分段高温硬煤轴向静载作用下的声发射及破碎分形特征研究

doi:10.13722/j.cnki.jrme.2021.1030

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Abstract 基于深部煤层注热、地下气化、煤层自燃等工程所处的高温、高静载、不均匀受热等环境，以深部硬煤为研究对象，采用自制加热设备加热煤样模拟深部的高温环境，施加轴向静载模拟煤层所受的高静载，开展不同加热长度的分段高温轴向静载声发射试验研究，分析煤体的变形破坏特征。研究结果表明：分段高温处理后的煤样应力–应变曲线可划分为压密、弹性、塑性和破坏4个阶段，且同一加热温度下，加热长度越长，煤样的压密过程越明显；煤样的抗压强度、弹性模量和泊松比随着加热长度的增加出现一定的波动，但整体上来说呈线性趋势减小；轴向压缩过程中没有始终伴随着声发射，且压密、弹性和塑性阶段，声发射的幅值、计数、能量的值较小，一旦进入破坏阶段，声发射参量便产生剧烈波动，且煤样发生宏观破坏时应力曲线跌落，声发射信号随之停止；轴向压缩过程中的声发射累计值从常温到100 ℃高温的变化非常明显，且累计值与常温状态下相比会有不同程度的降低，但在同一温度下，随着加热长度的增加声发射累计值与分段长度并没有明显的规律；对破碎后的煤块进行筛分试验及分形特征分析，发现煤样发生拉伸破坏的同时也伴随着剪切破坏，且分形维数的变化特征和煤样破坏块度的变化规律较一致，能较好的反映煤样破碎特征。

Key words：岩石力学硬煤分段加热轴向静载强度特征声发射分形特征

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	WANG Cheng1
	LEI Binbin1
	WANG Chun1
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	XIONG Zuqiang1
	ZHANG Yaohui3
	TAN Yi1

Cite this article:

WANG Cheng1,LEI Binbin1,WANG Chun1, et al. Research on acoustic emission and fragmentation characteristics of segmented high temperature hard coal under axial static loads[J]. , 2022, 41(7): 1394-1408.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.1030 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I7/1394

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