TIME-DEPENDENT FRICTION IN ROCKS
TIME-DEPENDENT FRICTION IN ROCKS
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DOI：
10.1029/jb077i020p03690
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发表时间：
1972-01-01
影响因子：
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通讯作者：
DIETERICH, JH
中科院分区：
文献类型：
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作者：
DIETERICH, JH
在20 - 850 bar法向应力范围内，对多孔砂岩、石英岩、杂砂岩和花岗岩进行了摩擦实验。在此范围内，在清洁的粗糙地面上滑动最初是稳定的。然而，由于动力岩石碎片积累在滑动表面上，粘滑成为滑动的主导模式。具有凿痕的表面的静摩擦系数表现出高度时间依赖性的行为。静摩擦力随着相邻块体保持静止接触的时间的对数而增加。在整个法向应力范围内，粘滑事件之间105秒间隔的静摩擦比15秒间隔的静摩擦大6%至10%。这种行为可能对理解地震前震、余震和断层蠕动的机制有重要意义。
Friction experiments have been conducted on porous sandstone, quartzite, graywacke, and granite in the 20‐ to 850‐bar normal stress range. Sliding on clean rough‐ground surfaces is initially stable for this range. However, as powered rock debris accumulates on the slip surface, stick slip becomes the dominant mode of sliding. The coefficient of static friction of surfaces with gouge exhibits a highly time‐dependent behavior. Static friction increases with the logarithm of the time that adjacent blocks remain in stationary contact. Over the entire range of normal stresses the static friction for 105‐sec intervals between stick‐slip events is greater than the static friction for 15‐sec intervals by 6 to 10%. This behavior may be significant in understanding the mechanisms of earthquake foreshocks, aftershocks, and fault creep.