循环应力损伤对煤体冲击倾向性影响研究

杨永亮; 任建慧; 李宣良; 杜涛涛

doi:10.13272/j.issn.1671-251x.2022120064

循环应力损伤对煤体冲击倾向性影响研究

doi: 10.13272/j.issn.1671-251x.2022120064

1.
国能神东煤炭集团有限责任公司布尔台煤矿，内蒙古鄂尔多斯　017209
2.
中煤科工开采研究院有限公司，北京　100013

基金项目: 山西省科学技术厅青年科技研究基金项目（201901D211004）；山西省应用基础研究计划项目（20210302124440）。

详细信息

作者简介:
杨永亮（1982—），男，河北石家庄人，高级工程师，硕士，主要从事采矿工程、矿山压力研究工作，E-mail：yangyongliang_01@163.com

中图分类号: TD713.2
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出版历程
- 收稿日期: 2022-12-20
- 修回日期: 2023-10-15
- 网络出版日期: 2023-10-23

Research on the influence of cyclic stress damage on coal bursting liability

1.
Buertai Coal Mine, CHN Energy Shendong Coal Group Co., Ltd., Ordos 017209, China
2.
CCTEG Coal Mining Research Institute, Beijing 100013, China

摘要

摘要: 目前对煤岩体动力学行为特征的研究仅考虑了温度、围压等原始地质作用影响，并未考虑煤炭开采过程中产生的循环应力作用对煤体动力学特性的影响；且对煤体动力学显现特征的判定是以煤体冲击倾向性指标为基本依据，而循环应力损伤作用对煤体冲击倾向性及其动力学特性的影响尚未进行深入研究。针对上述问题，对煤样开展了循环应力损伤试验，分析了恒上下限及变上限2种循环应力损伤条件下的煤体冲击倾向性变化特征。试验结果表明：① 煤体经恒上下限循环应力作用及变上限循环应力作用后静态抗压强度分别降低了13.86%与16.00%，循环应力会对煤体力学强度产生劣化。② 原始煤体剩余弹性能指数为27.34 kJ·m⁻³，表示该煤体具有弱冲击倾向性，经过恒上下限循环应力损伤及变上限循环应力损伤后煤体剩余弹性能指数分别降低了约26.30%及 36.14%，表明循环应力对煤体的冲击倾向性有显著的弱化作用。③ 随着煤体剩余弹性能指数的降低，煤体动态抗压强度与动态弹性模量均减小，而动态破坏变形不断增大，表明煤体冲击倾向性将直接影响其动力学特征，煤体冲击倾向性越大，其冲击动力学相关参数劣化程度越高。④ 随着煤体剩余弹性能指数不断降低，冲击后煤体破碎分形维数降低，表明循环应力使得煤体受冲击后崩解不充分，动力学响应减弱。
- 煤体 /
- 煤体动力学 /
- 冲击倾向性 /
- 剩余弹性能指数 /
- 冲击载荷 /
- 循环应力损伤
Abstract: Currently, research on the dynamic behavior features of coal and rock masses only considers the influence of original geological processes such as temperature and confining pressure, without considering the impact of cyclic stress generated during coal mining on the dynamic features of coal. And the determination of the dynamic features of coal is based on the index of coal bursting liability. The impact of cyclic stress damage on coal bursting liability and its dynamic features has not been thoroughly studied. In order to solve the above problems, cyclic stress damage tests are conducted on coal samples. The variation features of coal bursting liability under two cyclic stress damage conditions, namely constant upper and lower limits and variable upper limits, are analyzed. The experimental results show the following points. ① The static compressive strength of coal under the action of constant upper and lower limit cyclic stress and variable upper limit cyclic stress has decreased by 13.86% and 16.00%, respectively. Cyclic stress can degrade the mechanical strength of coal. ② The remaining elastic energy index of the original coal body is 27.34 kJ·m⁻³. It indicates that the coal body has a weak bursting liability. After constant upper and lower limit cyclic stress damage and variable upper limit cyclic stress damage, the remaining elastic energy index of the coal body has decreased by about 26.30% and 36.14%, respectively. It indicates that cyclic stress has a significant weakening effect on the bursting liability of the coal body. ③ As the remaining elastic energy index of the coal decreases, the dynamic compressive strength and dynamic elastic modulus of the coal decrease, while the dynamic failure deformation continuously increases. It indicates that the bursting liability of the coal will directly affect its dynamic features. The greater the bursting liability of the coal, the higher the degree of degradation of its impact dynamics related parameters. ④ As the remaining elastic energy index of the coal body continues to decrease, the fractal dimension of coal fragmentation after impact decreases. It indicates that cyclic stress leads to insufficient disintegration of the coal body after impact and weakened dynamic response.
- coal body /
- coal dynamics /
- bursting liability /
- residual elastic energy index /
- impact load /
- cyclic stress damage

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图 1 岩石力学试验系统及声发射监测系统

Figure 1. Rock mechanics test system and acoustic emission monitoring system

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图 2 SHPB试验系统及试验实拍

Figure 2. SHPB test system and test photos

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图 3 煤试件动态应力平衡验证

Figure 3. Verification of dynamic stress balance for coal specimens

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图 4 煤试件恒上下限循环加卸载应力−应变曲线

Figure 4. Constant upper and lower limit cyclic loading and unloading stress-strain curves of the coal specimen

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图 5 煤样变上限循环加卸载应力−应变曲线

Figure 5. Stress-strain curves of coal specimen under cyclic loading and unloading with variable upper limit

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图 6 典型M_h1煤试件经过100次恒上下限应力循环试验与典型M_b1煤试件经过100次变上限应力循环试验过程中声发射事件累计数与空间分布

Figure 6. The cumulative number and spatial distribution of acoustic emission events in typical M_h1 coal specimens after 100 times of constant upper and lower limit stress cycle tests and typical M_b1 coal specimens after 100 times of variable upper limit stress cycle test

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图 7 冲击载荷下3类煤样的应力−应变曲线

Figure 7. Stress-strain curves of three types of coal samples under impact load

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图 8 煤试件循环应力作用下典型应力−应变曲线

Figure 8. Typical stress-strain curves of coal specimens subjected to cyclic stress

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图 9 煤体剩余弹性能指数与动力学参数关系曲线

Figure 9. Incremental relation curve between residual elastic energy index and dynamic parameters of coal

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表 1 2类循环加卸载条件下煤试件的试验结果

Table 1. Test results of coal specimen under two kinds of cyclic loading and unloading conditions

加载类型	试件编号	第1次循环/(kJ·m⁻³)		第10次循环/(kJ·m⁻³)		第50次循环/(kJ·m⁻³)		第80次循环/(kJ·m⁻³)		第100次循环/(kJ·m⁻³)		P/MPa	U_e^c/ (kJ·m⁻³)	U_d^p/ (kJ·m⁻³)
加载类型	试件编号	U_in¹	U_e¹	U_in¹⁰	U_e¹⁰	U_in⁵⁰	U_e⁵⁰	U_in⁸⁰	U_e⁸⁰	U_in¹⁰⁰	U_e¹⁰⁰	P/MPa	U_e^c/ (kJ·m⁻³)	U_d^p/ (kJ·m⁻³)
恒上下限循环	M_h1	16.76	13.12	16.14	12.89	13.75	13.56	12.37	10.57	11.87	9.48	9.15	25.38	4.17
恒上下限循环	M_h2	16.15	12.87	15.57	12.24	13.02	12.72	11.82	10.04	11.14	9.11	8.86	24.12	5.03
变上限循环	M_b1	17.25	14.02	17.98	14.56	21.13	19.32	23.48	21.06	25.74	21.89	8.56	23.75	5.91
变上限循环	M_b2	18.12	15.26	18.68	15.08	21.67	19.88	23.76	21.47	26.42	23.41	9.02	24.81	7.73

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表 2 循环应力损伤后煤样动力学破碎块度分析

Table 2. Dynamic fragmentation analysis of coal samples after cyclic stress damage

C_EF/（kJ·m⁻³）	r/mm	直径小于r的煤块质量/kg	k/%	$ \ln \dfrac{r}{{\rm{mm}}} $	ln k	D
27.34	12	20.37	32.59	2.42	2.73	1.37
	10	14.22	22.75	2.04	2.28
	8	10.74	17.18	1.54	1.82
	6	7.12	11.39	1.21	1.38
	4	4.65	7.44	0.89	1.14
	3	3.06	4.90	0.77	0.97
	2	2.34	0.037	0.54	−0.50
20.15	12	18.42	29.00	2.11	2.47	1.20
	10	12.36	19.46	1.82	2.05
	8	11.04	17.39	1.78	1.92
	6	8.55	13.46	1.65	1.87
	4	6.11	9.62	1.31	1.50
	3	4.17	6.57	1.07	1.28
	2	2.85	4.49	0.80	−0.51
17.46	12	15.72	23.93	2.07	2.38	1.13
	10	11.37	17.31	1.80	1.97
	8	10.68	16.26	1.75	1.91
	6	10.33	15.72	1.67	1.82
	4	8.01	12.19	1.52	1.75
	3	6.44	9.80	1.28	1.47
	2	3.15	4.79	0.98	−0.32

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