College of Safety Science and Engineering, Henan Polytechnic University
Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization
Engineering Research Center of Ministry of Educa⁃tion for Coal Mine Disaster Prevention and Emergency Relief

目的目的为了研究深部强矿压工作面水力压裂裂纹扩展规律,方法方法以余吾煤矿的3号煤层S5207回风巷为工程背景,首先建立水力压裂力学模型,分析最大周向拉应变准则和裂纹扩展准则,其次通过三维数值模拟,分析水力压裂裂纹扩展影响因子D和地应力对水力压裂裂纹扩展规律的影响,并根据现场情况设计水力压裂试验方案,实施水力压裂增透技术,分析现场施工效果。结果结果结果表明:预制裂纹沿着与原裂纹呈一定角度开裂并向外延伸,其扩展方向最终与最小主应力方向垂直;随着D增大,裂纹与原裂纹的夹角越来越小,当D较大时,裂纹呈现自相似的扩展状态;不同应力场下,裂纹扩展轨迹主要取决于主应力方向,最终与最小主应力方向垂直,水力裂缝为垂直缝,且在裂纹尖端有应力集中现象;现场监测发现,裂纹扩展符合最大周向拉应变准则,裂纹尖端沿着环向拉应变最大的地方扩展,环向拉应变达到最大时裂纹开始扩展,压裂过程中出现了较大环向裂隙,裂纹沿垂直于最小主应力方向延伸,与S5207回风巷的最大水平主应力方向大致相同,与数值模拟结果接近。结论结论研究结果可为深部强矿压工作面水力压裂提供参考和依据。

Objectives To investigate the crack propagation behavior of hydraulic fracturing in deep high-stress mining panels, Methods using the S5207 return airway of the No. 3 coal seam in Yuwu Coal Mine as the engineering background, a hydraulic fracturing mechanical model was established to analyze the maxi‑mum circumferential tensile strain criterion and crack propagation criterion. Subsequently, a three-dimensional numerical simulation was conducted to examine the effects of the hydraulic fracturing influence factor D and in-situ stress on crack propagation. Based on field conditions, a hydraulic fracturing test plan was designed, permeability enhancement technology was implemented, and the field performance was ana‑lyzed. Results The results indicate that prefabricated cracks propagate outward at an angle to the original crack and ultimately align perpendicular to the minimum principal stress direction. As the D value in‑creases, the angle between the new and original cracks decreases, and the cracks exhibit self-similar propa‑gation when D is sufficiently large. Under varying stress fields, crack propagation trajectories are primarily governed by the principal stress direction, ultimately aligning perpendicular to the minimum principal stress. Hydraulic fractures are vertical and exhibit stress concentration at the crack tips. On-site monitoring revealed that the observed phenomena conformed to the maximum circumferential tensile strain criterion: crack tips extended along regions of maximum circumferential tensile strain, with cracking initiated when this strain reached its peak. During fracturing, significant circumferential fractures were observed. The cracks propagated perpendicular to the minimum principal stress direction, aligning approximately with the maximum horizontal principal stress direction of the S5207 return airway, which closely matched the nu‑merical simulation results. Conclusions The integration of numerical simulations, theoretical analysis, and field experiments provides valuable insights into the crack propagation behavior of hydraulic fracturing in deep high-stress mining panels. The findings offer useful references for hydraulic fracturing design and nu‑merical simulation studies in similar mines such as Yuwu Coal Mine.

国家自然科学基金资助项目(52074104);河南省科技攻关项目(222102320142)

陈立伟,王东杰,边乐.深部强矿压工作面水力压裂裂纹扩展规律研究[J].河南理工大学学报(自然科学版),2025,44(1):18‑28.

CHEN L W, WANG D J, BIAN L. Study on the propagation behavior of hydraulic fractures in deep high-stress mining panels[J]. Journal of Henan Polytechnic University (Natural Science),2025,44(1):18-28.