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近场裂隙群的存在对水力压裂起裂力学行为的影响至关重要。通过单轴水力压裂试验、声发射监测及数字图像扫描技术，对花岗岩起裂过程中的力学与破裂特征进行研究。试验数据的统计学分析结果表明，近场裂隙群的存在显著降低了花岗岩的起裂压力、声发射振铃技术和能量，且呈现指数衰减规律。近场裂隙数量在达到双裂隙之后，起裂压力衰减速率显著降低，即裂隙数量的增加对起裂压力的影响弱化。破裂面几何分形维数在近场裂隙群的影响下，亦呈现统计意义上的显著差异，随着近场裂隙数量的增加，分形维数亦呈现增长特征，破裂面几何特征更为复杂，分形维数与起裂压力呈现负相关的线性关系。
Abstract：The presence of near-field fracture clusters plays a critical role in governing the mechanical behavior of fracture initiation during hydraulic fracturing processes. This study systematically investigates the mechanical properties and fracture propagation mechanisms in granite through uniaxial hydraulic fracturing tests, acoustic emission monitoring, and digital image scanning techniques. Statistical analysis of the experimental data shows that near-field fracture clusters induce significant reductions in fracture initiation pressure, acoustic emission activity, and energy dissipation, all of which follow an exponential decay pattern. When fracture density exceeds two cracks, the attenuation rate of the cracking pressure has decreased significantly, indicating a diminishing influence of fracture quantity on pressure reduction. Fracture surface morphology exhibits statistically significant variations under different fracture cluster configurations, with fractal dimension demonstrating a positive correlation with fracture density. The increasing complexity of fracture surfaces with higher fracture density is characterized by a negative linear relationship between fractal dimension and initiation pressure.
[1] XUE Y,LIU S,CHAI J R,et al.Effect of water-cooling shock on fracture initiation and morphology of high-temperature granite:Application of hydraulic fracturing to enhanced geothermal systems[J].Applied energy,2023,337:120858.
[2] GUO J C,LU Q L,LIU Z,et al.Concept and key technology of “multi-scale high-density” fracturing technology:A case study of tight sandstone gas reservoirs in the western Sichuan Basin[J].Natural gas industry B,2023,10(3):283-292.
[3] 崔少英，包腾飞，崔健健.水工隧洞中水力劈裂临界孔隙水压计算方法[J].水电能源科学，2012,30(5):62-64,170.(CUI S Y,BAO T F,CUI J J.Computing method study of critical pore water pressure of hydraulic splitting in hydraulic tunnel[J].Water resources and power,2012,30(5):62-64,170.(in Chinese))
[4] 苏海健，靖洪文，赵洪辉，等.平行裂隙群岩体强度与破裂特征的试验研究[J].工程力学，2015,32(5):192-197,207.(SU H J,JING H W,ZHAO H H,et al.Strength and fracture characteristic of rock mass containing parallel fissures[J].Engineering mechanics,2015,32(5):192-197,207.(in Chinese))
[5] 赵洪宝，胡桂林，李伟，等.预制裂隙岩石裂纹扩展规律的研究进展与思考[J].地下空间与工程学报，2016,12(增刊2):899-906.(ZHAO H B,HU G L,LI W,et al.Research progress and thinking on the crack propagation law of pre-fractured rock[J].Chinese journal of underground space and engineering,2016,12(S2):899-906.(in Chinese))
[6] 申林方，华涛，王志良，等.参数空间变异性对岩石水力压裂裂隙扩展形态的影响[J].岩土力学，2025,46(4):1294-1302.(SHEN L F,HUA T,WANG Z L,et al.Effect of parameter spatial variability on fracture propagation morphology of rock hydraulic fracturing[J].Rock and soil mechanics,2025,46(4):1294-1302.(in Chinese))
[7] 唐巨鹏，路江伟，许鹏，等.预制裂缝对煤系页岩水力压裂效果影响的试验研究[J].实验力学，2018,33(1):150-158.(TANG J P,LU J W,XU P,et al.Experimental investigation on the effect of prefabricated cracks on hydrofracture of coal measure shale[J].Journal of experimental mechanics,2018,33(1):150-158.(in Chinese))
[8] Lü M L,ZHU Z D,ZHOU L M,et al.Numerical simulation of hydraulic fracture propagation in rock masses with pre-existing double fractures using the phase field method[J].Rock and soil mechanics,2024,45(6):1850-1862.
[9] 蒋长宝，付银兰，王光淇.水力压裂煤裂隙网络表征与造缝性能评估试验研究[J].煤炭科学技术，2023,51(6):62-71.(JIANG C B,FU Y L,WANG G Q.Experimental study on characterization hydraulic fracturing coal fracture network and evolution of fracture forming performance[J].Coal science and technology,2023,51(6):62-71.(in Chinese))
[10] 牛双建，靖洪文，杨大方，等.单轴压缩下破裂岩样强度及变形特征[J].采矿与安全工程学报，2015,32(1):112-118,125.(NIU S J,JING H W,YANG D F,et al.Experimental study on strength characteristics and deformation behavior of the cracked rock samples under uniaxial compression[J].Journal of mining and safety engineering,2015,32(1):112-118,125.(in Chinese))
基本信息:
DOI：10.20040/j.cnki.1000-7709.2026.20250454
中图分类号:TU45
引用信息:
[1]胡宝文,黄卓悦,宿辉,等.近场裂隙群对花岗岩水力压裂起裂力学行为的试验研究[J].水电能源科学,2026,44(01):94-98+156.DOI:10.20040/j.cnki.1000-7709.2026.20250454.
基金信息:
河北省自然科学基金项目基础研究专项(E2020402087);河北省自然科学基金项目(E2019402256)
2025-03-12
2025
2025-04-11
2025
1
2025-12-24
2025-12-24
2025-12-24