坚硬孔洞压裂岩体动态破裂力学响应特征

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中图分类号：TU452 文献标志码：A 文章编号：1008-0562（2026）01-0025-09

ZHENGRuiIUXuejian，SHLei，etal.Dynamic fracture mechanicalresponsecharacteristicsofhyraulicallfracturedockmass withhardholes[J].JoualofiaoingechncalUiversity（NatralSience），0645：-3.O：1056 0562.20250251

Dynamic fracture mechanical response characteristics of hydraulically fractured rock masswithhard holes

ZHENGRui'，LIUXuejianl*，SHILei²，YANGQifan1³，XUDong1 （1.School of Mining and Geomatics，Hebei University of Engineering， Handan O56o38， China; 2.Anhui Development Mining Company Limited，Lu'an 237462， China;3.China Nuclear Industry 25th Construction Company Limited， Changsha 41oooo， China）

Abstract： To address the severe rock mass damage and deformation during the hydraulic fracturing pressure relief process in mines，based on elasticity mechanics and impact dynamics，a correlation model between the dissipatedenergy ofrock mass fracture damage and water pressure aswell as theequivalent radius of fracture damage was established.Using numerical simulation methods，dynamic hydraulic fracturing-uniaxial static compression coupling numerical tests were conducted on marble specimens with different diameter holes to study thecoupling efect mechanismof hole diameter and fracturing step on the mechanical properties and failure characteristics of the specimens.The research results indicate that the disipated energy of rock mass fracture damage is positively corelated with water pressure and the equivalent radius offracture damage.The fracture evolution presents three stages： initiation，rapid expansion，and stable expansion.Anincrease in holediameter significantly enhances the stress disturbance of the surrounding rock.For rock samples with diferent fracturing hole diameters，the driving failure mode changes from hole dominance to fracture control and eventually to composite failure due to the differentiation of stress gradient and thecompetition of weakened interfaces.The peak stress-strain response shows three stages： initial damage instability，main fracture weakening，and residual strength balance，following an exponential decay law.The damage evolution of rock mass fractured by holes isjointly controlled by hole diameter and fracturing step

Keywords： hydraulic fracturing; dynamic fracture; mechanical property; fracture propagation; acoustic emission

0引言

近年来，随着深部金属矿开采深度的增加，高应力诱发的岩爆问题日益突出，水力压裂技术因高效卸压、精准可控及环境友好等优势，成为防控岩爆的核心技术[1-3]。（剩余14177字）