Study on I/III mixed fracture characteristics of coal in different regions of China

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL Theoretical and Applied Fracture Mechanics Pub Date : 2024-10-09 DOI:10.1016/j.tafmec.2024.104712

Wei Wang , Chaolin Wang , Yu Zhao , Kun Zheng , Jing Bi

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Abstract

The fracture mechanical property of coal rock constitutes an important mechanical constraint for hydraulic fracturing of coal reservoir, and its three-dimensional fracture characteristics hold great significance for coal-bed methane mining. In this study, non-invasive methods were employed to investigate the pore structure and permeability of coal, aiming to understand the gas storage, distribution, and mobility of coal from various regions. To assess the influence of geological stress on coal during coal-bed methane mining, a three-point bending test was conducted to determine the characteristics of coal I/III mixed fractures. The experimental results indicate that with the decrease of the modal mixing parameter M^e, the fracture area expends, the fracture load P_f and fracture energy E_f increase, while the fracture toughness declines. The 3D fracture criterion is utilized to predict the toughness ratio of coal rock I/III mixed fracture. The 3D-MTS and 3D-MMTSN criteria offer the upper and lower limits of prediction respectively. The 3D-MTSED criterion proves to be a more appropriate fracture criterion for analyzing the 3D fracture.

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中国不同地区煤炭 I/III 混合断裂特征研究

煤岩的断裂力学性质是煤储层水力压裂的重要力学约束条件，其三维断裂特征对煤层气开采具有重要意义。本研究采用非侵入方法研究煤的孔隙结构和渗透性，旨在了解不同地区煤的瓦斯储存、分布和流动性。为评估煤层气开采过程中地质应力对煤炭的影响，进行了三点弯曲试验，以确定煤炭 I/III 混合裂缝的特征。实验结果表明，随着模态混合参数 Me 的减小，断裂面积增大，断裂载荷 Pf 和断裂能 Ef 增加，而断裂韧性下降。利用三维断裂准则预测了煤岩 I/III 混合断裂的韧性比。3D-MTS 和 3D-MMTSN 准则分别提供了预测的上限和下限。事实证明，3D-MTSED 准则是分析三维断裂的更合适的断裂准则。

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来源期刊

Theoretical and Applied Fracture Mechanics 工程技术-工程：机械

CiteScore

8.40

自引率

18.90%

发文量

435

审稿时长

37 days

期刊介绍： Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.