黄金科学技术 ›› 2023, Vol. 31 ›› Issue (3): 516-530.doi: 10.11872/j.issn.1005-2518.2023.03.142
• 采选技术与矿山管理 • 上一篇
Wencai WANG1(),Junpeng LI1,2(),Chuangye WANG1,Shijiang CHEN1,Peng WANG1
摘要:
为分析青砂岩(QSY)在外荷载下的声发射特征及损伤演化规律,在声发射基础上,根据岩石损伤演化的自组织性、丛集行为及幂律分布特性,结合砂岩结构特征、分形理论和Weibull分布函数,建立了青砂岩损伤二维元胞模型。结果表明:青砂岩试样在荷载后期的塑性变形阶段轴向应力曲线发生线性突变是试样发生破坏的最终结果,破坏值为48.5 MPa,该阶段因微裂隙贯通形成大裂隙,存在事件率缺失现象,该现象为试样破坏前兆特征,破坏方式主要为单斜面和双斜面剪切破坏,形成剪切裂纹;试样受载损伤的3个阶段与AE信号表现特征存在类同,在损伤萌生阶段试样因受矿山生产影响内部存在微缺陷,在此阶段形成损伤演化现象,但间隔损伤值为0.41,未达到所建立元胞模型的不稳定损伤值(0.43),未发生破坏;随着损伤值增大至0.599时(大于0.43),试样发生失稳破坏,损伤值快速增长至1。根据岩石损伤演化相关规律和理论建立的二维元胞模型,能够反映青砂岩在外荷载下受力破坏过程和损伤演化规律,为相关研究提供参考和借鉴。
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