Ring-shear test data of feldspar sand FS900S used in the Tectonic Modelling Laboratory at the University of Bern (Switzerland)

The data presented here are produced ring shear testing using a SCHULZE RST-01.pc (Schulze, 1994, 2003, 2008) at the Helmholtz Laboratory for Tectonic Modelling (HelTec) of the GFZ German Research Centre for Geosciences in Potsdam. The RST is specially designed to measure friction parameters of bulk solids accurately at low confining pressures and shear velocities similar to analogue model (“sandbox”) experiments. In this tester, with shear cell of type “No. 1”, a sand layer is sheared internally at constant normal stress σN and shear velocity v while shear force and lid displacement (corresponding to volume change ΔV) are measured continuously. For more details see Klinkmüller et al. (2016) and Ritter et al. (2016).本数据集的数据通过使用SCHULZE RST-01.pc型仪器（Schulze, 1994, 2003, 2008）开展环剪试验（ring shear testing）获得，试验地点位于德国波茨坦的德国地球科学研究中心（GFZ）亥姆霍兹构造模拟实验室（HelTec）。该RST仪器专为在低围压（confining pressure）与剪切速率（shear velocity）条件下精准测量散体（bulk solids）的摩擦参数而设计，其试验工况可类比相似模拟（analogue model）“砂箱”实验。在该测试仪中采用1号型剪切盒（shear cell）时，可在恒定法向应力（normal stress）σ_N与剪切速率v的条件下对砂层实施内部剪切，同时持续采集剪切力与盒盖位移数据，盒盖位移对应体积变化ΔV。更多细节可参阅Klinkmüller等人（2016）与Ritter等人（2016）的相关研究成果。