Shear strength (handheld penetrometer) from IODP Hole 386-M0090B

Shear strength from handheld penetrometer of the above given hole of International Ocean Discovery Program (IODP) Expedition 386 (Japan Trench Paleoseismology). This dataset was obtained at the end of the core processing workflow during the third phase (Personal Sampling Party, PSP) of expedition 386, which took place between 2022-11-15 – 2022-11-30 onboard D/V Chikyu. Measurements were performed on the work halves of core sections using a handheld (pocket) penetrometer equipped with a 10 mm diameter tip. The tip was pushed 6.3 mm perpendicular to the split core surface with the measuring pin downward until the groove marked on the tip was even with the level of the core surface. The resulting resistance (compressive strength) was read from the device and used to calculate undrained shear strength. At each measurement depth, three measurements were conducted and the resulting undrained shear strength averaged. In the case of major discrepancies between the three measurements, the team verified the results by repeating the measurements. […]

本数据集涵盖国际大洋发现计划（International Ocean Discovery Program, IODP）386航次（日本海沟古地震学研究）指定钻孔的手持贯入仪（handheld penetrometer）剪切强度实测数据。该数据集采集于386航次第三阶段——个人采样队（Personal Sampling Party, PSP）岩芯处理流程的尾声阶段。本次航次于2022年11月15日至2022年11月30日期间在"地球号"（D/V Chikyu）钻探船上执行。测量操作采用配备10毫米直径探头的手持贯入仪，针对岩芯劈分后的工作半芯开展：将探头带测针的一端垂直于劈开的岩芯表面推入6.3毫米，直至探头上的刻槽与岩芯表面齐平；读取设备显示的阻力（抗压强度），并以此计算不排水剪切强度。每个测量深度处均完成三次重复测量，最终取三次不排水剪切强度的平均值。若三次测量结果存在显著偏差，研究团队将通过重复测量验证结果。[…]