基于相场法的高压电脉冲-水力压裂岩体裂缝扩展规律研究OA
Study on Fracture Propagation in Rock Masses under High-voltage Electric Pulse and Hydraulic Fracturing Based on Phase Field Method
为研究高压电脉冲-水力压裂岩体裂缝扩展规律,以流体力学、断裂力学、损伤力学为基础,基于相场法,利用数值软件,研究了水压和高压电脉冲联合作用下岩体初始裂缝的演化特征,并对岩体裂缝长度的增长值以及岩体的损伤情况进行了描述.研究结果表明,电压、水压、地应力、注水速率及能量释放率对岩体裂缝长度和岩体的损伤均产生一定影响.具体而言,随着水压和电压的增加,岩体的损伤致裂程度加剧.当地应力从 8 MPa减小至6 MPa,初始裂缝增长长度增加了30%,岩体损伤面积增加了10%,且地应力应力差越大,裂缝越偏向最大主应力的方向.水压、电压和地应力对岩体初始裂缝增长量以及岩体损伤面积的影响程度排序为:地应力>电压>水压.研究还发现,随着注水速率和能量释放率的提升,初始裂缝的增长量及岩体的损伤面积均呈现增大的趋势.且当注水速率增加至18 kg/(m3 ⋅ s)时,钻孔附近出现多条短小裂缝且初始裂缝增长量较16 kg/(m3 ⋅ s)有大幅度提高.当能量释放率Gc 增加到50 N/m时,岩石的初始裂缝和新生裂缝增长显著,且钻孔周围损伤明显加剧.研究结果可为高压电脉冲-水力压裂岩体中裂缝增长量及岩体损伤量表达提供新思路,并为工程破岩设备参数调整提供参考.
To investigate the fracture propagation patterns in rock masses subjected to high-voltage electric pulse and hydraulic fracturing,based on fluid mechanics,fracture mechanics,and damage me-chanics,this study employed the phase field method and numerical software to investigate the evolu-tion characteristics of initial fractures in rock masses under the combined effects of water pressure and high-voltage electric pulses.Additionally,the increase in fracture length and the damage conditions of the rock mass were described.The results showed that voltage,water pressure,in-situ stress,water injection rate,and energy release rate all exerted certain effects on the fracture length and damage of the rock mass.Specifically,as water pressure and voltage increased,the extent of damage-induced fracturing in the rock mass intensified.When the in-situ stress decreased from 8 MPa to 6 MPa,the initial fracture growth length increased by 30%,and the damaged area of the rock mass increased by 10%.Moreover,the greater the in-situ stress difference,the more the fractures deviated toward the di-rection of the maximum principal stress.The influence of water pressure,voltage,and in-situ stress on the initial fracture growth and damaged area of the rock mass was ranked as follows:in-situ stress>voltage>water pressure.Furthermore,the study found that with the increase of water injec-tion rate and energy release rate,both the growth of initial fractures and the damaged area of the rock mass showed an increasing trend.When the water injection rate was elevated to 18 kg/(m3⋅s),multi-ple short fractures emerged in proximity to the borehole,and the initial fracture growth was significant-ly higher than that at 16 kg/(m3⋅s).When the energy release rate was elevated to 50 N/m,the initial fractures and new fractures in the rock mass increased significantly,and the damage around the bore-hole was noticeably aggravated.The research findings can provide novel insights for characterizing fracture growth and rock mass damage in rock masses subjected to high-voltage electric pulse and hy-draulic fracturing,and offer a valuable reference for adjusting the parameters of engineering rock-breaking equipment.
饶平平;王俊瑶;金潇;崔纪飞
上海理工大学环境与建筑学院,上海 200093上海理工大学环境与建筑学院,上海 200093上海理工大学环境与建筑学院,上海 200093上海理工大学环境与建筑学院,上海 200093
能源科技
高压电脉冲水力压裂电-流-固耦合相场法裂缝扩展
high-voltage electric pulsehydraulic fracturingelectric-fluid-solid couplingphase field methodfracture propagation
《防灾减灾工程学报》 2026 (2)
325-336,12
国家自然科学基金面上项目(42077435,42377171)资助
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