含水率影响下煤样拉伸与压缩力学特性试验

doi:10.16265/j.cnki.issn1003-3033.2024.06.0104

中国安全科学学报 ›› 2024, Vol. 34 ›› Issue (6): 146-156.doi: 10.16265/j.cnki.issn1003-3033.2024.06.0104

含水率影响下煤样拉伸与压缩力学特性试验

张美长¹(), 白晨浩²^,^**(), 祁云³, 汪伟³, 薛凯隆², 任杰伟¹

¹ 辽宁工程技术大学矿业学院,辽宁阜新 123000
² 山西大同大学煤炭工程学院,山西大同 037002
³ 辽宁工业大学机械工程与自动化学院,辽宁锦州 121001

收稿日期:2023-12-23 修回日期:2024-03-23 出版日期:2024-06-28
通讯作者:
**白晨浩(2001—),男,内蒙古准格尔旗人,硕士研究生,主要研究方向为矿井灾害防治、应急技术与管理等。E-mail: 15248405464@163.com。
作者简介:
张美长 (1987—),男,辽宁阜新人,博士,讲师,硕士生导师,主要从事矿山压力控制及灾害防治。zhangmeichang@lntu.edu.cn。
祁云副教授
汪伟副教授
基金资助:
辽宁省教育厅基本科研项目(LJKMZ20220690); 山西省基础研究计划(自由探索类)青年项目(202203021222300); 山西省高等学校科技创新计划项目(2022L448); 山西省高等学校科技创新计划项目(2022L449)

Experimental study on tensile and compressive mechanical properties of coal samples under influence of water content

ZHANG Meichang¹(), BAI Chenhao²^,^**(), QI Yun³, WANG Wei³, XUE Kailong², REN Jiewei¹

¹ College of Mining, Liaoning University of Engineering and Technology, Fuxin Liaoning 123000, China
² School of Coal Engineering, Shanxi Datong University, Datong Shanxi 037002, China
³ College of Mechanical Engineering and Automation,Liaoning University of Technology, Jinzhou Liaoning 121001, China

Received:2023-12-23 Revised:2024-03-23 Published:2024-06-28

摘要/Abstract

摘要：

为揭示含水率对煤样拉伸与压缩力学特性的影响,选取韩家洼煤业公司22号煤层煤样,开展不同含水率和围压下煤样的巴西圆盘劈裂试验、单轴压缩试验以及三轴压缩试验,探究含水煤样的力学变化特征。结果表明:煤样的强度、弹性模量随含水率增加呈指数函数降低,煤样达到饱和状态时,其强度下降了48.3%,弹性模量下降了37.6%;随着含水率的增加,煤样的塑性增强,试样容易破碎;三轴压缩下,围压升高煤样破坏的峰值有所提升,煤样的强度提高,但不同围压状况下含水煤样的强度明显低于干燥试样;含水率对于煤样的内摩擦角影响较小,但对煤样的黏结力有显著影响。

关键词: 含水率, 煤样, 拉伸, 压缩试验, 力学特性

Abstract:

In order to reveal the effect of water content on the tensile and compressive mechanical properties of coal samples, coal samples from the No.22 seam of the Hanjiawa coal mine were selected. Brazilian disc splitting tests, uniaxial compression tests, and triaxial compression tests were conducted on coal samples with different moisture contents and confining pressures to explore the mechanical characteristics of water containing coal samples. The results show that the strength and elastic modulus of coal samples decreases exponentially with increasing water content. When the coal samples reach saturation, the strength and elastic modulus decrease by 48.3% and 37.6% respectively. With the increase in water content, the plasticity of coal samples is enhanced, and the samples are prone to breakage. Under triaxial compression, the peak value of failure and the strength of coal samples increase with the increase of confining pressure. However, the strength of water-bearing coal samples under different confining pressures is obviously lower than that of dry coal samples. The water content has little effect on the internal friction angle of coal samples but has a significant effect on the cohesive force of coal samples.

Key words: water content, coal sample, tensile, compression test, mechanical property

中图分类号:

X936

张美长, 白晨浩, 祁云, 汪伟, 薛凯隆, 任杰伟. 含水率影响下煤样拉伸与压缩力学特性试验[J]. 中国安全科学学报, 2024, 34(6): 146-156.

ZHANG Meichang, BAI Chenhao, QI Yun, WANG Wei, XUE Kailong, REN Jiewei. Experimental study on tensile and compressive mechanical properties of coal samples under influence of water content[J]. China Safety Science Journal, 2024, 34(6): 146-156.

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试样编号	直径/ mm	长度/ mm	含水率/ %	峰值载荷/kN	抗拉强度/MPa
BD-1	49.57	26.63	0	4.29	2.07
BD-2	49.69	25.633	0	3.82	1.91
BD-3	49.50	26.36	0	3.59	1.75
平均值	—	—	—	3.90	1.91
BDW1-1	49.60	25.14	1.76	2.23	1.14
BDW1-2	49.47	25.33	1.70	2.20	1.12
BDW1-3	49.79	25.11	1.81	2.57	1.31
平均值	—	—	—	2.33	1.19
BDW2-1	49.51	26.67	3.62	1.56	0.75
BDW2-2	49.75	26.40	3.58	1.94	0.94
BDW2-3	49.69	27.03	3.57	1.90	0.90
平均值	—	—	—	1.80	0.86

编号	直径/ mm	长度/ mm	含水率/%	围压/ MPa	强度/ MPa	弹性模量/GPa
DC-4	49.81	99.16	0	2	61.8	4.1
DC-5	49.79	100.15	0	4	66.7	3.8
DC-6	49.75	94.65	0	6	75.7	4.1
DC-7	49.78	97.77	0	10	85.6	4.0
WC1-4	49.81	99.96	1.69	2	48.7	3.0
WC1-5	49.78	100.23	1.78	4	63.8	2.9
WC1-6	49.82	100.17	1.77	6	70.3	3.0
WC1-7	49.85	100.11	1.82	10	75.4	3.2
WC2-4	49.83	100.06	3.57	2	40.6	2.2
WC2-5	49.78	101.22	3.56	4	50.8	2.5
WC2-6	49.81	100.08	3.52	6	58.3	2.6
WC2-7	49.80	100.35	3.62	10	67.2	2.9

含水率影响下煤样拉伸与压缩力学特性试验

Experimental study on tensile and compressive mechanical properties of coal samples under influence of water content

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