低围压下含瓦斯煤三轴压缩变形时的能量变化规律

doi:10.16265/j.cnki.issn1003-3033.2023.S1.1942

中国安全科学学报 ›› 2023, Vol. 33 ›› Issue (S1): 203-208.doi: 10.16265/j.cnki.issn1003-3033.2023.S1.1942

低围压下含瓦斯煤三轴压缩变形时的能量变化规律

孟伟¹(), 高霞², 张保勇³, 吴强³

¹ 西安科技大学安全科学与工程学院, 陕西西安 710054
² 黑龙江科技大学建筑工程学院,黑龙江哈尔滨 150022
³ 黑龙江科技大学安全工程学院, 黑龙江哈尔滨 150022

收稿日期:2023-01-21 修回日期:2023-04-07 出版日期:2023-06-30
作者简介:
孟伟 (1994—),男,江苏无锡人,博士研究生,主要研究方向为煤岩体力学性质。E-mail: 1435605639@qq.com。
高霞副教授
张保勇教授
吴强教授
基金资助:
国家自然科学基金面上项目(51974112); 国家自然科学基金面上项目(51674108)

Study on energy change of gas-containing coal during triaxial compression under low pressure

MENG Wei¹(), GAO Xia², ZHANG Baoyong³, WU Qiang³

¹ College of Safety and Engineering, Xi'an University of Science and Technology, Xi'an Shaanxi 710054, China
² School of Architecture & Civil Engineering, Heilongjiang University of Science & Technology, Harbin Heilongjiang 150022, China
³ School of Safety Engineering, Heilongjiang University of Science & Technology, Harbin Heilongjiang 150022, China

Received:2023-01-21 Revised:2023-04-07 Published:2023-06-30

摘要/Abstract

摘要：

为探究煤体在受压过程中的能量特征及临界破坏点能量变化规律,基于常规三轴压缩下含瓦斯煤的应力-应变曲线,分析含瓦斯煤破坏过程中弹性应变能和耗散能随应变变化的规律,据此给出含瓦斯煤在不同围压、含水率下变形破坏时的能量解释。研究结果表明:有效能比在同一围压下随着含水率的增大先增加后减小,表明含水率的增大会降低煤样强度。建立围压和含水率对含瓦斯煤三轴压缩变形过程中临界破坏点总能量耦合关系的多元线性回归方程,取得了较好的拟合度。

关键词: 含瓦斯煤, 三轴压缩, 能量特征, 有效能比, 临界破坏点

Abstract:

To explore the energy characteristics of coal under pressure and the law of energy change of critical destruction point, based on the stress-strain curve of gas-containing coal during conventional triaxial compression, the law of elastic strain energy and dissipation energy change with strain in the process of gas-containing coal destruction was studied. The energy explanation for the deformation of gas-containing coal under different moisture contents and different pressures was given. The results show that the effective energy ratio increases first and then decreases with the increasing moisture content under the same pressure, indicating that the increase in moisture content decreases the strength of coal samples. A multi-linear regression equation of the total energy coupling relationship between the critical destruction point during the triaxial compression deformation of gas-containing coal and pressure and moisture content was established, with a better fitting effect.

Key words: gas-containing coal, triaxial compression, energy characteristics, effective energy ratio, critical destruction point

孟伟, 高霞, 张保勇, 吴强. 低围压下含瓦斯煤三轴压缩变形时的能量变化规律[J]. 中国安全科学学报, 2023, 33(S1): 203-208.

MENG Wei, GAO Xia, ZHANG Baoyong, WU Qiang. Study on energy change of gas-containing coal during triaxial compression under low pressure[J]. China Safety Science Journal, 2023, 33(S1): 203-208.

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σ₃/ MPa	ω/%	U/ (MJ·m^-3)	U^e/ (MJ·m^-3)	U^d/ (MJ·m^-3)	(U^e/U)/ %
1	3.48	0.082	0.045	0.037	54.87
1	6.95	0.100	0.059	0.041	59.00
1	11.14	0.102	0.055	0.047	53.92
2	3.48	0.129	0.073	0.056	56.59
2	6.95	0.152	0.090	0.062	59.21
2	11.14	0.249	0.148	0.101	58.43
3	3.48	0.270	0.143	0.127	52.96
3	6.95	0.278	0.169	0.109	60.79
3	11.14	0.313	0.187	0.126	59.74

低围压下含瓦斯煤三轴压缩变形时的能量变化规律

Study on energy change of gas-containing coal during triaxial compression under low pressure

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