摘要
为了研究薄喷材料对裂隙岩石力学性质和破坏特征的影响,开展了无薄喷和有薄喷岩石的单轴压缩和巴西劈裂试验,分析了薄喷材料对岩石强度的提升作用。利用离散元模拟软件PFC3D建立了裂隙岩石离散元模型,研究单轴压缩和巴西劈裂条件下,薄喷材料对不同裂隙倾角岩石峰值强度、能量特征和破坏模式的影响。结果表明:薄喷材料提高了不同倾角的裂隙试样的抗压强度、抗拉强度,增加了破坏时所需的总能量、弹性应变能。裂隙倾角15°时,薄喷材料对试样的提升作用最明显,且可以限制拉伸裂纹扩展。因此,薄喷材料不仅可以加固裂隙围岩、防止岩块脱落,而且有助于保持岩体完整性,从而有效预防剥落与岩爆等灾害发生。
To study the influence of thin spray materials on the mechanical properties and failure characteristics of flawed rocks,uniaxial compression and Brazilian splitting tests were conducted on rocks without and with thin spray,and the enhancement effect of thin spray materials on rock strength was analyzed.Then,a discrete element model of flawed rock was established using numerical simulation software PFC3D to study the effects of thin spray materials on peak strength,energy characteristics,and failure modes of rocks with different fracture angles under uniaxial compression and Brazilian splitting conditions.The results shows that the thin spray material improved the compressive strength and tensile strength of crack specimens with different flaw angles,and increases the total energy and elastic strain energy at failure.When the crack inclination angle is 15°,the thin spray material has the most significant enhancement effect on the specimen and can limit the propagation of tensile cracks.Therefore,thin spray materials not only reinforce fractured surrounding rocks and prevent rock blocks from falling off,but also help maintain the integrity of the rock mass,effectively preventing disasters such as peeling and rock bursts.
作者
杨绍玉
姜凤传
叶守杰
张福勇
韩勇
刘源
张培元
YANG Shaoyu;JIANG Fengchuan;YE Shoujie;ZHANG Fuyong;HAN Yong;LIU Yuan;ZHANG Peiyuan(Qingdao Metro Line 6 Co.,Ltd.,Qingdao Shandong 266500,China;Shandong High-Speed Infrastructure Construction Co.,Ltd,Ji'nan 250014,China;School of Civil Engineering,Shandong University,Ji'nan 250002,China)
出处
《有色金属(矿山部分)》
2025年第4期129-138,共10页
NONFERROUS METALS(Mining Section)
基金
国家重点研发计划项目(2022YFB2602100)
山东省自然科学基金(ZR2021ZD36)。
关键词
离散元
裂隙岩石
薄喷材料
拉伸强度
压缩强度
discrete element method
fractured rock
thin spray material
tensile strength
compressive strength
