吸附CO2煤体静力学特性及细观损伤破坏特征

doi:10.3724/1000-6915.jrme.2024.0353

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摘要为探究不同CO2–荷载耦合作用对煤体力学特性及细观损伤破坏特征的影响，采用工业CT扫描系统、MTS 816岩石力学加载装置以及自主研制的气–固耦合试验装置，对原煤开展不同CO2压力条件下的单轴加载试验，分析CO2压力对煤体力学特性、破坏模式的影响，并基于图像处理技术分别从二维、三维尺度探究煤体细观损伤演化特征和裂纹扩展规律，从宏–细观层面揭示煤体对CO2–荷载耦合作用的力学响应机制。结果表明：(1) 气–固耦合作用下煤体应力–应变曲线可分为4个典型阶段，且峰值强度和弹性模量均随初始CO2压力增加呈劣化趋势；(2) 煤体裂隙扩展可分为裂隙吸附扩展阶段、裂隙压密闭合阶段、新裂隙萌生发育阶段和裂隙快速扩展贯通阶段，裂隙体积、裂隙率和三维分形维数均与气压呈正相关，且受CO2气楔效应影响，受载煤体内部裂隙空间分布复杂化，破坏形式由单一的张拉破坏逐渐转为张拉、剪切共存的复合型破坏；(3) 基于三维孔隙率定义了损伤变量，发现其值逐渐由0增至0.34，近似呈指数型上升，且通过对比气–固耦合作用下煤体峰值强度与损伤变量所得的理论强度，验证了损伤变量的合理性。

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	王磊
	张宇
	朱传奇
	刘怀谦
	陈礼鹏
	李少波
	吴雨轩

关键词 ：岩石力学, CO2吸附, 原煤, 静力学特性, 细观损伤, 破坏特征

Abstract：In order to explore the influence of different CO2-load coupling effects on the mechanical properties and meso-damage and failure characteristics of coal mass，the uniaxial loading tests of raw coal under different CO2 pressures were carried out by using industrial CT scanning system，MTS 816 rock mechanics loading device and self-developed gas-solid coupling test device. The influence of CO2 pressure on the mechanical properties and failure mode of coal was analyzed. Based on image processing technology，the meso-damage evolution characteristics and crack propagation laws of coal bodies are explored from two-dimensional and three-dimensional scales respectively，and the mechanical response mechanism of coal bodies to CO2-load coupling is revealed from the macro-meso-level. The results indicate that：(1) the stress-strain curve of coal mass under gas-solid coupling can be divided into four typical stages，and both peak strength and elastic modulus exhibited a degradation trend with increasing initial CO2 pressure. (2) Coal fracture expansion can be divided into fracture adsorption and expansion stage，fracture compaction and closing stage，new fracture initiation and development stage，and fracture rapid expansion and penetration stage，the fracture volume，fracture rate and three-dimensional fractal dimension are positively correlated with CO2 pressure，additionally，influenced by the CO2 gas wedge effect，the spatial distribution of fractures inside the loaded coal mass becomes complex，and its failure form gradually changes from a single tension failure to a compound failure in which tension and shear coexist. (3) The damage variable was defined based on three-dimensional porosity，and it was found that its value gradually increased from 0 to 0.34，approximately exhibiting an exponential rise. By comparing the peak strength of the coal under gas-solid coupling with the theoretical strength obtained from the damage variable，the rationality of the damage variable was validated.

Key words： rock mechanics CO2 sorption raw coal statics characteristic meso-damage failure characteristics

引用本文:

王磊，张宇，朱传奇，刘怀谦，陈礼鹏，李少波，吴雨轩. 吸附CO2煤体静力学特性及细观损伤破坏特征[J]. 岩石力学与工程学报, 2025, 44(1): 56-68.
WANG Lei，ZHANG Yu，ZHU Chuanqi，LIU Huaiqian，CHEN Lipeng，LI Shaobo，WU Yuxuan. Static mechanical properties and microstructural damage characteristics of CO2 adsorbed coal mass. , 2025, 44(1): 56-68.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.3724/1000-6915.jrme.2024.0353 或 https://rockmech.whrsm.ac.cn/CN/Y2025/V44/I1/56

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