静水压状态下深部岩石动态压缩力学行为及能量耗散特征试验研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (6) : 280-288.

论文

方士正1，李炜煜2，杨阳1，陈程1，许鹏3

作者信息 +

Experimental study on the dynamic mechanical behavior and energy dissipation characteristics of deep rock under coupled impact loading and hydrostatic pre-stress

FANG Shizheng1, LI Weiyu2, YANG Yang1, CHEN Cheng1, XU Peng3

Author information +

文章历史 +

摘要

以深部岩石为研究对象，利用分离式霍普金森杆（SHPB）实验系统，开展静水压力作用下深部岩石的动力学测试，分析了静水压、冲击气压大小对岩石动态强度、耗散能的影响规律，并在此基础上分析了岩石的破坏特征。通过试验结果发现，岩石动态强度表现出显著的率效应特性，随着冲击气压的增加而增大，呈现出线性正相关关系；岩石动态强度随着静水压力的增加呈非线性增加，采用二项式拟合后发现具有较好的相关性；通过对岩石耗散能分析发现，当岩石所处静水压力相同时，岩石的能量吸收率随着冲击气压的增加而提高；相同冲击气压情况下，岩石的能量吸收率随静水压的增加而减小，表明静水压力对岩石变形具有约束作用；最后，对岩石的表观破坏形态分析发现，低静水压时岩石破坏以剪切裂纹为主，随着静水压的增加，岩石中同时存在剪切裂纹和环向裂纹。本文的研究成果可为深部岩石工程建设提供动力学基础参数，具有一定的参考意义。

Abstract

With the development of deep rock engineering, the mechanical response of rock under in-situ stress needs to be studied. In this study, the dynamic characteristics of deep rock under hydrostatic pre-stress is carried out by using the split Hopkinson pressure bar (SHPB) experimental system. The effects of hydrostatic pre-stress and dynamic load rate on rock dynamic strength and dissipated energy are analyzed, and the rock failure characteristics are also studied. Results show that the dynamic strength of rock shows a significant rate effect, which increases with the increase of impact air pressure, showing a linear positive correlation; and it will increase nonlinearly with the increase of hydrostatic pre-stress, and has a well correlation after binomial fitting. As to energy evolution, it is found that the energy absorption proportion of rock increases with the increase of impact air pressure, and the hydrostatic pre-stress has an opposite effect on the rock energy absorption proportion, which reflects the constraint effect of hydrostatic pre-stress on rock deformation. Finally, the rock apparent failure mode is analyzed. It is found that the rock failure is mainly controlled by shear cracks at low hydrostatic pre-stress. With the increase of hydrostatic pre-stress, shear crack and circular crack appear simultaneously in the sample. The research results can provide basic parameters for deep rock engineering construction.

导出引用

方士正1，李炜煜2，杨阳1，陈程1，许鹏3. 静水压状态下深部岩石动态压缩力学行为及能量耗散特征试验研究[J]. 振动与冲击, 2023, 42(6): 280-288

FANG Shizheng1, LI Weiyu2, YANG Yang1, CHEN Cheng1, XU Peng3. Experimental study on the dynamic mechanical behavior and energy dissipation characteristics of deep rock under coupled impact loading and hydrostatic pre-stress[J]. Journal of Vibration and Shock, 2023, 42(6): 280-288

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