CO2作用下煤体裂隙发育及三维动力学特性研究

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振动与冲击 ›› 2025, Vol. 44 ›› Issue (9) : 135-146.

振动理论与交叉研究

CO2作用下煤体裂隙发育及三维动力学特性研究

王磊1，廖志鹏1，陈礼鹏*1，杨震宇1，吴雨轩1，李伟利2

作者信息 +

Fracture development and 3D dynamic characteristics of coal body under action of CO 2

WANG Lei1, LIAO Zhipeng1, CHEN Lipeng*1, YANG Zhenyu1, WU Yuxuan1, LI Weili2

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摘要

为研究CO2吸附对煤体裂隙及其三维动力学特性的影响，利用高压气体吸附解吸系统和CT扫描系统分别对煤样开展了CO2吸附实验和扫描实验，实现了对吸附前后煤样内部裂隙的精准提取及数字化定量表征，并结合自主研发的高温高压含气煤岩动静组合加载系统对煤样开展了不同CO2压力和围压作用下三维动态冲击试验，分析了煤样的动态力学参数，最后从数值模拟角度探讨了煤体裂隙发育与强度劣化间的内在联系。结果表明：（1）吸附CO2会促进煤体内部裂隙扩展并伴随新生裂隙的萌发，导致裂隙网络更加复杂，且作用效果随CO2压力升高而加剧。（2）不同CO2压力作用下，煤体三维动态应力-应变曲线变化趋势大致相同，CO2压力和围压均会影响煤体的动力学特性，CO2会弱化煤体的动态强度和动态弹性模量，而围压作用会使煤体的动态强度和动态弹性模量增加。（3）CO2压力的增大会导致煤体孔隙率不断增大，减小煤体有效承载体积，进而导致煤体宏观力学特性的劣化，同时围压的存在会限制煤样环向变形，且围压越大，限制作用越强。

Abstract

To study the effects of CO2 adsorption on coal fracture development and its three-dimensional dynamic properties, a high-pressure gas adsorption-desorption system and a CT scanning system were used to conduct CO2 adsorption and scanning experiments on coal samples. This enabled precise extraction and digital quantitative characterization of internal fractures in the coal samples before and after CO2 adsorption. Additionally, a self-developed high-temperature, high-pressure, gas-bearing coal rock dynamic-static combined loading system was employed to perform three-dimensional dynamic impact tests on the coal samples under varying CO2 and confining pressures. The dynamic mechanical parameters of the coal samples were analyzed, and numerical simulations were used to explore the intrinsic relationship between fracture development and strength degradation in coal. The results showed that: (1) CO2 adsorption promotes internal fracture propagation within coal, leading to the emergence of new fractures and a more complex fracture network, with these effects intensifying as CO2 pressure increases; (2) the three-dimensional dynamic stress-strain curves of coal exhibit a similar trend under different CO2 pressures, with both CO2 pressure and confining pressure influencing the dynamic properties of coal. CO2 weakens the coal's dynamic strength and dynamic elastic modulus, whereas confining pressure enhances both parameters; (3) an increase in CO2 pressure causes a continuous increase in coal porosity, reducing the effective load-bearing volume and leading to a deterioration in the macroscopic mechanical properties of the coal. At the same time, confining pressure restricts circumferential deformation of the coal sample, with greater confining pressure resulting in stronger restriction effects.

导出引用

王磊1, 廖志鹏1, 陈礼鹏1, 杨震宇1, 吴雨轩1, 李伟利2. CO2作用下煤体裂隙发育及三维动力学特性研究[J]. 振动与冲击, 2025, 44(9): 135-146

WANG Lei1, LIAO Zhipeng1, CHEN Lipeng1, YANG Zhenyu1, WU Yuxuan1, LI Weili2. Fracture development and 3D dynamic characteristics of coal body under action of CO 2[J]. Journal of Vibration and Shock, 2025, 44(9): 135-146

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