Numerical study on roadway stress relief of surrounding rock through hydraulic fracturing-induced roof cracking based on phase-field theory

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2025-08-12 DOI:10.1016/j.tafmec.2025.105171

Huaidong Liu, Changyou Liu, Fengfeng Wu, Zhenhua Chen, Haolei Li

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引用次数: 0

Abstract

Hydraulic fracturing is a primary method for relief stress in roadway surrounding rock (RSR). However, the impact of fracturing parameters on fracture propagation behavior and RSR stress mechanisms remain unclear. Therefore, this study establishes a hydro-mechanical coupling model for the fracturing in roadway roof based on phase-field theory. Building upon this model, we thoroughly investigate the influence mechanisms of two key factors—crack spacing and drilling angles—on hydraulic fracture propagation behavior and the stress evolution of RSR. Results show that fracturing range and fracture ratio positively correlate with both crack spacing and angle between drillings. Fracture network complexity, while not significantly correlated with these factors, most strongly influences RSR stress relief. As crack spacing increases, RSR stress relief fluctuates but remains within the stress reduction zone in all directions. Drilling angles significantly regulate the stress field: when drillings on opposite sides of the roadway and the fractures can penetrate, RSR stress relief is substantial, placing the entire roadway within the stress reduction zone. Conversely, unconnected fractures or drillings on one side creates stress increase zones. To optimize RSR stress relief, a larger angle between drillings is recommended, provided that the fractures can still be penetrated effectively. These findings provide practical guidance for parameter optimization in hydraulic fracturing strategies in roadway roof management.

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基于相场理论的水力破裂致顶板开裂巷道围岩应力释放数值研究

水力压裂是巷道围岩卸压的主要方法。然而，压裂参数对裂缝扩展行为和RSR应力机制的影响尚不清楚。因此，本研究基于相场理论建立了巷道顶板破裂的水-力耦合模型。在此模型的基础上，深入研究了裂缝间距和钻井角度两个关键因素对水力裂缝扩展行为和RSR应力演化的影响机制。结果表明，压裂范围和裂缝比与裂缝间距和井眼夹角呈正相关。裂缝网络复杂性虽然与这些因素不显著相关，但对RSR应力释放的影响最大。随着裂纹间距的增大，RSR应力释放呈波动趋势，但在各个方向上都保持在应力消减区内。钻孔角度对应力场的调节作用显著，当巷道对侧钻孔且裂缝能够穿透时，RSR应力释放较大，使整个巷道处于应力减小区。相反，未连接的裂缝或一侧的钻井会产生应力增加区。为了优化RSR应力释放，在保证裂缝仍能有效穿透的前提下，建议采用更大的钻井角度。研究结果对巷道顶板水力压裂策略的参数优化具有实际指导意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.