Experimental friction data for different grain size quartz gouges under different effective normal stresses (NERC Grant NE/P002943/1)

The data are from a suite of friction experiments performed on 3 different grain size quartz gouges (5, 15 and 30 microns). The quartz gouge layers were sheared under a range of effective normal stresses (40-120 MPa), at a displacement rate of 1 micron/s, and the evolution of shear stress was monitored with increasing displacement (up to a maximum displacement of 8.5 mm). The gouges typically exhibit a transition from stable sliding, where the gouge layers shear in a continuous smooth fashion, to unstable sliding with displacement, where the gouges exhibit stick-slip behaviour. The transition from stable to unstable sliding occurs more efficiently in fine-grained quartz gouges and is promoted by high effective normal stresses.

本数据集来源于一系列在三种不同粒径（5、15及30微米）的石英 gouge 上进行的摩擦实验。石英 gouge 层在40至120 MPa的有效正应力范围内，以1微米/秒的位移速率进行剪切，并随着位移的增加（直至最大位移8.5毫米）监测剪切应力的演变。gouge 层通常表现为从稳定的滑动过渡到具有位移的滑动不稳定性，其中gouge 层以连续光滑的方式剪切，而后出现粘滑行为。在细粒度石英 gouge 中，从稳定到不稳定滑动的转变更为高效，且高有效正应力可促进这一转变。