A Dynamic-induced Direct-shear Model for Dynamic Triggering of Frictional Slip on Simulated Granular Gouges
A Dynamic-induced Direct-shear Model for Dynamic Triggering of Frictional Slip on Simulated Granular Gouges
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DOI：
10.1007/s11340-013-9823-5
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发表时间：
2014-04
影响因子：
2.4
通讯作者：
Wei Wu;Jian Zhao
中科院分区：
文献类型：
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作者：
Wei Wu;Jian Zhao
本研究提出了动态诱导直剪模型来研究模拟颗粒凿岩上摩擦滑移的动态触发。入射纵波作为剪切载荷产生，并且法向应力不断地施加在凿岩层上。剪切应力在入射阶段累积，在滑移阶段发生摩擦滑移，而没有反射波的影响。实验结果表明，沿凿岩层存在不均匀的剪应力分布，这可能是由剪切载荷引起的扭矩和沿该层的法向应力振动引起的。后缘处的剪切应力强烈影响沿纵波载荷方向的摩擦滑移，而前缘处的回弹应力沿相反方向传播。当后缘处的最大剪切应力达到临界值时，就会触发摩擦滑动。法向应力影响后缘处的最大剪应力、最大滑移位移和滑移速度。最后讨论了该模型的优点和局限性。
This study presents a dynamic-induced direct-shear model to investigate the dynamic triggering of frictional slip on simulated granular gouges. An incident P-wave is generated as a shear load and a normal stress is constantly applied on the gouge layer. The shear stress accumulates in the incident stage and the frictional slip occurs in the slip stage without the effect of the reflected wave. The experimental results show a non-uniform shear stress distribution along the gouge layer, which may be induced by a shear load induced torque and by normal stress vibration along the layer. The shear stress at the trailing edge strongly affects the frictional slip along the P-wave loading direction, while the rebound stress at the leading edge propagates along the opposite direction. The frictional slip is triggered when the maximum shear stress at the trailing edge reaches a critical value. The normal stress influences the maximum shear stress at the trailing edge, the maximum slip displacement and the slip velocity. The advantages and the limitations of this model are discussed at the end.