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首页> 美国卫生研究院文献>PLoS Clinical Trials >Dynamic mechanical characteristics and failure mode of serpentine under a three-dimensional high static load and frequent dynamic disturbance
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Dynamic mechanical characteristics and failure mode of serpentine under a three-dimensional high static load and frequent dynamic disturbance

机译：三维高静载荷和频繁动态扰动下蛇形结构的动态力学特性和破坏模式

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摘要

The improved split Hopkinson pressure bar (SHPB) was used to study the dynamic mechanical properties and failure characteristics of surrounding rock in deep rock mass engineering that is under high stress and affected by blasting excavation and other dynamic disturbances. In a three-dimensional high static load and frequent dynamic disturbance test, the preload high axial pressure and confining pressure are used to simulate the high crustal stress of deep rock, and the effect of small disturbances on the rock is simulated by the low impact load. The results show that there are two types of dynamic stress-strain curves of deep rock: an elastic-plastic curve and plastic-elastic-plastic curve. The curves consists of five parts: the compaction stage, micro-crack steady development stage, micro-crack unstable propagation stage, fatigue damage stage, and fatigue failure stage. Reductive phenomena of constringent strain after dynamic peak stress appear because of the different degrees of rock damage. Moreover, these phenomena include two conditions, namely, whether rebound occurs or not. The impact resistance of rock is strongest when the ratio of the confining pressure to axial pressure is optimal, and the dynamic average strength of rock and accumulative impact times decrease with the increase of the preloaded axial compression and increase with the increase of the preloaded confining pressure. Both the dynamic deformation modulus and dynamic peak stress decrease with the increase of the accumulative impact time, while the maximum strain and the dynamic peak strain increase. The corresponding rebound strain as a whole first increases and then decreases with the increasing impact times. For deep rock, tensile failure and single-bevel plane shear failure are the main failure modes, and pull-compression mixed friction failure is the auxiliary failure mode. Additionally, the lumpiness of broken rock decreases with the increase of the preloaded axial compression and increases with the increase of the preloaded confining pressure.
机译：改进的裂口霍普金森压力杆（SHPB）用于研究深部岩体工程中高应力，受爆破开挖和其他动力扰动影响的围岩的动态力学特性和破坏特性。在三维高静载荷和频繁动力扰动试验中，采用预载高轴向压力和围压模拟深部岩石的高地壳应力，并通过低冲击载荷模拟了小扰动对岩石的影响。结果表明，深部岩石的动应力-应变曲线有两种类型：弹塑性曲线和塑性-弹塑性曲线。曲线包括五个部分：压实阶段，微裂纹稳定发展阶段，微裂纹不稳定扩展阶段，疲劳破坏阶段和疲劳破坏阶段。由于岩石破坏程度的不同，出现动态峰值应力后，收敛应变的还原现象出现。而且，这些现象包括两个条件，即是否发生回弹。当围压与轴向压力之比最佳时，岩石的抗冲击性最强，岩石的动态平均强度和累积冲击时间随预压轴向压缩力的增加而减小，并随预压围压的增加而增加。 。动态变形模量和动态峰值应力都随着累积冲击时间的增加而减小，而最大应变和动态峰值应变都增加。总体上，相应的回弹应变首先随冲击时间的增加而增大，然后减小。对于深部岩石，拉伸破坏和单斜面剪切破坏是主要破坏模式，拉压混合摩擦破坏是辅助破坏模式。另外，破碎岩石的块度随着预紧轴向压缩力的增加而减小，并且随着预紧围压的增加而增加。

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