真三轴应力条件下破断煤体力学响应及渗流特性试验研究

doi:10.16265/j.cnki.issn1003-3033.2023.06.1428

中国安全科学学报 ›› 2023, Vol. 33 ›› Issue (6): 105-113.doi: 10.16265/j.cnki.issn1003-3033.2023.06.1428

真三轴应力条件下破断煤体力学响应及渗流特性试验研究

刘玉冰¹^,²(), 王恩元¹^,², 张东明³, 李铭辉⁴

1 中国矿业大学煤矿瓦斯与火灾防治教育部重点实验室,江苏徐州 221116
2 中国矿业大学安全工程学院,江苏徐州 221116
3 重庆大学煤矿灾害动力学与控制国家重点实验室,重庆 400044
4 深圳大学深地科学与绿色能源研究院,广东深圳 518060

收稿日期:2023-01-14 修回日期:2023-04-07 出版日期:2023-08-07
作者简介:
刘玉冰 (1992—),男,黑龙江佳木斯人,博士,讲师,主要从事安全科学与工程、矿山岩石力学等方面的教学与研究工作。E-mail:liuyubing@cumt.edu.cn。
基金资助:
国家自然科学基金青年基金资助(52104231); 中国博士后科学基金面上项目资助(2020M681775); 中央高校基本科研业务费专项资金资助(2021QN1088)

Experimental study on mechanical response and seepage characteristics of broken coal under true triaxial stress conditions

LIU Yubing¹^,²(), WANG Enyuan¹^,², ZHANG Dongming³, LI Minghui⁴

1 Key Laboratory of Gas and Fire Control for Coal Mines, Ministry of Education, China University of Mining and Technology, Xuzhou Jiangsu 221116, China
2 School of Safety Engineering, China University of Mining and Technology, Xuzhou Jiangsu 221116, China
3 State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
4 Institute of Deep Earth Sciences and Green Energy, Shenzhen University, Shenzhen Guangdong 518060, China

Received:2023-01-14 Revised:2023-04-07 Published:2023-08-07

摘要/Abstract

摘要：

为探究煤炭深部开采过程中破断区域煤体的力学及渗流特性,利用多功能真三轴流固耦合试验系统,结合计算机断层扫描(CT)技术分析破断煤体破坏后的内部裂隙分布情况,获得不同中间主应力下破断煤体的强度特征、渗透率演化及破坏模式。研究结果表明:真三轴应力条件下破断煤体呈现出脆-延性破坏特征,随着中间主应力的增大,峰值强度呈现先增大后减小的变化趋势;破断煤体的渗透率在临近破坏前并未出现大幅增长,在进入峰后阶段总体呈下降趋势,且在峰前阶段变化更为明显;破断煤体破坏后的裂隙形式以剪切裂隙为主,宏观剪切破裂面呈现非对称分布特征。应根据现场煤层破断区域构造应力和裂隙结构的变化,调整煤层破断区域瓦斯抽采或破碎煤岩巷道注浆加固方案,保障深部煤炭安全开采。

关键词: 真三轴应力, 破断煤体, 力学响应, 渗流特性

Abstract:

In order to investigate the mechanical response and seepage characteristics of coal in broken areas during deep underground coal mining, the multi-functional true triaxial fluid-solid coupling apparatus was used. The distribution of internal fractures of broken coal after failure was detected and analyzed by using the computed tomography (CT) scanning system. The strength characteristics, permeability evolution, and failure modes of broken coal under different intermediate principal stresses were obtained. The research results show that broken coal presents brittle-ductile failure characteristics under true triaxial stress conditions, and the peak strength shows an ascending-then-descending trend with the increase of intermediate principal stresses. The permeability of the broken coal body does not increase significantly before failure and continues to decrease at the post-peak stage. Furthermore, the permeability varies more at the pre-peak stage. The macro-fracture forms of broken coal after failure are mainly shear fractures, and the macro-shear failure plane presents asymmetrical distribution characteristics. In order to ensure the safe mining of deep coal, attention should be paid to the change of tectonic stress and fracture structure in the broken coal seam area on site, and the gas drainage in the broken coal seam area or the grouting reinforcement scheme for the broken coal rock roadway should be adjusted.

Key words: true triaxial stress, broken coal, mechanical response, seepage characteristic

刘玉冰, 王恩元, 张东明, 李铭辉. 真三轴应力条件下破断煤体力学响应及渗流特性试验研究[J]. 中国安全科学学报, 2023, 33(6): 105-113.

LIU Yubing, WANG Enyuan, ZHANG Dongming, LI Minghui. Experimental study on mechanical response and seepage characteristics of broken coal under true triaxial stress conditions[J]. China Safety Science Journal, 2023, 33(6): 105-113.

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σ₂ / MPa	k₀ / (×10^-2 μm²)	峰值强度渗透率 k_p/(×10^-2μm²)	残余强度渗透率 k_r//(×10^-2μm²)
15	4.11	0.54	1.04
20	12.44	6.74	5.51
25	3.50	1.97	1.56
30	5.94	2.91	1.53

σ₂/MPa	D	R²
15	1.34	0.94
20	1.57	0.92
25	1.42	0.93
30	1.33	0.90

真三轴应力条件下破断煤体力学响应及渗流特性试验研究

Experimental study on mechanical response and seepage characteristics of broken coal under true triaxial stress conditions

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σ₂ / MPa	破裂面角度最小值/(°)	破裂面角度最大值/(°)	破裂面角度平均值/ (°)
15	45	54	49.5
20	60	67	63.5
25	45	53	49
30	60	70	65