采矿与岩层控制工程学报2024，Vol.6Issue(2)：1-14,14.
类岩石试件三轴扰动破坏特性试验研究
Experimental study on triaxial disturbance and failure characteristics of rock-like specimens
摘要
Abstract
To investigate the disturbance and failure mechanisms within high-stress surrounding rocks,this study conducted triaxial conventional compression and cyclic disturbance tests on rock-like specimens under various confining pressures,elucidating the specimens'disturbance stress-strain behavior and deformation failure charac-teristics.Additionally,Nuclear Magnetic Resonance(NMR)imaging tests were performed to delve deeper into these mechanisms from a microscopic standpoint.The findings reveal:(1)Under varying confining pressures,each specimen exhibited a threshold strength,beyond which axial deformation became markedly sensitive to dis-turbances,leading to significant specimen deformation upon reapplication of disturbances.Below this threshold,deformation showed insensitivity to disturbances.The ratio of threshold to ultimate strength reflects the speci-men's resistance to disturbances,which decreases with increasing confining pressure,indicating heightened sensi-tivity to disturbances under high-pressure conditions.(2)A weakening effect was observed in rock-like specimens under disturbance;for instance,specimens exhibited barrel failure under a conventional triaxial confining pressure of 10 MPa,while displaying oblique brittle failure akin to that observed under 5 MPa after disturbance,highlight-ing the transformative impact of disturbances on failure modes.(3)High-stress conditions prompted rock speci-mens to enter a plastic flow state,characterized by internal particle rearrangement and a significant shift in pore size distribution,with a notable decrease in both small and large pores in favor of medium-sized pores,overall reducing the specimen's porosity.These insights advance our understanding of the behavior of high-stress sur-rounding rocks under disturbances,offering valuable perspectives for engineering and geological applications.关键词
类岩石试件/三轴扰动/阈值强度/破坏形态/核磁共振Key words
rock-like specimen/triaxial disturbance/threshold intensity/destruction pattern/nuclear magnetic resonance分类
矿业与冶金引用本文复制引用
王军,朱传根,李勋,王波,张艺腾..类岩石试件三轴扰动破坏特性试验研究[J].采矿与岩层控制工程学报,2024,6(2):1-14,14.基金项目
国家自然科学基金资助项目(52274121) （52274121）
山东省自然科学基金资助项目(ZR2022ME162) （ZR2022ME162）
济南市"新高校 20 条"资助项目(202228106) （202228106）
