Experimental friction data for simulated Nankai Trough gouges sheared under a range of effective normal stress and pore-fluid pressure conditions (NERC Grant NE/S015531/1)

The data are from a suite of friction experiments performed on simulated gouges from the Nankai Trough (Japan). The simulated gouges were prepared by crushing cuttings of Nankai accretionary sediments collected during Integrated Ocean Drilling Program (IODP) Expedition 358. The cuttings were crushed to produce a powder (i.e. simulated gouge) with a grain size of >125 microns. These simulated gouges were sheared under a range of effective normal stress (10-75 Mpa) and pore-fluid pressure (5-75 Mpa) conditions while the sliding velocity was stepped between 0.3 and 3 microns/s to calculated the rate-and-state friction parameter (a-b). The Nankai gouge are strongly rate-strengthening and become more rate-strengthening (i.e. more frictionally stable) at elevated pore-fluid pressure. In contrast, varying the effective normal stress has minimal effect on the frictional stability of the gouges.

本数据集源自于对日本南海海槽模拟划痕的一系列摩擦实验。这些模拟划痕由收集于综合大洋钻探计划（Integrated Ocean Drilling Program，简称IODP）第358次探险中的南海增生沉积物岩屑破碎制成。岩屑被粉碎成粉末（即模拟划痕），其粒径大于125微米。这些模拟划痕在多种有效正应力（10-75 MPa）和孔隙流体压力（5-75 MPa）条件下进行剪切，滑动速度在0.3至3微米/秒之间变化，以此计算速率-状态摩擦参数（a-b）。南海划痕表现出显著的速率强化特性，并且在增高的孔隙流体压力下，其速率强化特性进一步增强（即摩擦稳定性提高）。相比之下，改变有效正应力对划痕的摩擦稳定性影响微乎其微。