IODP Expedition 385 Vane shear strength (AVS)

Shear strength was measured on section halves using a GEISA automated vane shear (AVS) frame and device controller. The device is suitable for sediment not affected by cementation (i.e., saturated, clay-rich, soft sediment). Shear strength measurements should be considered only approximate, particularly because the influence of pore pressure changes during the undrained experiment cannot be estimated. Report includes vane shear strength at the sample's failure point, maximum torque angle, penetration direction, and rate of vane rotation.本研究采用GEISA品牌的自动十字板剪切（automated vane shear, AVS）架及设备控制器，对剖分为两半的试样开展抗剪强度测试。该设备适用于未受胶结作用影响的沉积物，即饱和富黏土软沉积物。需说明，本次抗剪强度测试结果仅为近似值，尤其是不排水试验过程中孔隙压力变化的影响无法被估算。本次测试报告涵盖试样破坏点处的十字板抗剪强度、最大扭矩角、贯入方向及十字板旋转速率。