Shear strength (handheld penetrometer) from IODP Hole 386-M0091B@en

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. […]本数据集为国际大洋发现计划（International Ocean Discovery Program, IODP）386航次（日本海沟古地震学）前述钻孔的手持贯入仪剪切强度实测数据。该数据集采集于386航次第三阶段（个人采样组，Personal Sampling Party, PSP）的岩芯处理流程收尾阶段，本次作业时段为2022年11月15日至2022年11月30日，作业平台为‘地球号’（D/V Chikyu）科考钻探船。测量工作在岩芯段的工作半块上开展，采用配备直径10毫米探头的手持（袖珍）贯入仪：测试时将探头以测量针朝下的姿态垂直于劈开的岩芯表面推入6.3毫米，直至探头表面的刻槽与岩芯表面齐平，随后读取仪器显示的阻力（抗压强度）数值，用于计算不排水剪切强度。每个测量深度处均开展三次重复测量，取三次得到的不排水剪切强度的平均值作为最终结果；若三次测量结果存在显著偏差，科考团队将通过重复测量验证数据可靠性。[…]