工程地质学报2025，Vol.33Issue(3)：858-865,8.DOI:10.13544/j.cnki.jeg.2024-0579
流体注入对断裂面滑移过程中摩擦行为影响的试验研究
EXPERIMENTAL STUDY ON THE IMPACT OF FLUID INJECTION ON THE FRICTIONAL BEHAVIOR DURING FAULT SLIDING
摘要
Abstract
Seismicity results from the rapid release of elastic energy during unstable fault slip.Recent studies have demonstrated that high-pressure fluid injection during hydraulic fracturing for reservoir stimulation can induce fault activation and seismic events.The stick-slip behavior associated with unstable fault slip plays a key role in triggering such seismicity.This study investigates the frictional behavior of fault instability induced by fluid injection,with comparative analysis of dry(non-fluid-injection)conditions.Through triaxial compression experiments on shale specimens,we examine fault slip instability under two loading conditions:(1)axial stress-driven slip and(2)con-stant-rate fluid injection.By monitoring stress and displacement evolution while calculating shear stress and friction coefficients,we systematically analyze how fluid injection affects post-instability frictional behavior.Key findings re-veal:(1)Under dry conditions,the friction coefficient exhibits cyclic weakening and recovery around～0.6 following stick-slip events.(2)With fluid injection,immediate stress drop triggers instability,evolving into prolonged slow slip with high-frequency stick-slip recurrence.(3)Subsequent frictional weakening leads to significant slip displace-ment until fluid pressure approaches the minimum principal stress,when strengthening behavior dominates-ultimate-ly ceasing slip as sliding velocity asymptotically approaches zero.The experiments demonstrate that fluid injection can reduce the friction coefficient from～0.6 to near-zero values,unequivocally establishing pore pressure's control-ling influence on fault stability.These results provide critical insights for preventing induced seismicity during reser-voir stimulation through optimized pore pressure management.关键词
页岩/断层滑移/流体注入/摩擦行为Key words
Shale/Fault slip/Fluid injection/Frictional behavior分类
天文与地球科学引用本文复制引用
王泽华,赫建明,郑博,毛天桥,李守定,李晓..流体注入对断裂面滑移过程中摩擦行为影响的试验研究[J].工程地质学报,2025,33(3):858-865,8.基金项目
国家自然科学基金项目(资助号:42090023),国家重点研发计划项目(资助号:2023***3106500).This research is supported by the National Natural Science Foundation of China(Grant No.42090023)and National Key Research and Development Program of China(Grant No.2023***3106500). （资助号:42090023）
