Data from: Non-coaxiality of sand under bi-directional shear loading

This study aims to investigate the effect of consolidation shear stress magnitude on the shear behaviour and noncoaxiality of soils. In previous drained bi-directional simple shear test on Leighton Buzzard sand, it is showed that the level of non-coaxiality, which is indicated by the angle difference between the principal axes of stresses and the corresponding principal axes of strain rate tensors, is increased by increasing angle difference between the direction of consolidation shear stress and secondary shearing. This paper further investigated the relation, and includes results with higher consolidation shear stresses. Results agree with previous relation, and further showed that increasing consolidation shear stresses decreased the level of non-coaxiality in tests with angle difference between 0 to 90 degrees, and increased the level of non-coaxiality in tests with angle difference between 90 to 180 degrees.

本研究旨在探究固结剪应力（consolidation shear stress）大小对土体剪切特性与非共轴性（noncoaxiality）的影响。既往针对莱顿巴扎德砂开展的排水型双向简单剪切试验（drained bi-directional simple shear test）结果显示，非共轴性水平由应力主轴（principal axes of stresses）与对应应变速率张量（strain rate tensors）主轴之间的夹角差表征，且该水平随固结剪应力方向与次级剪切（secondary shearing）方向的夹角差增大而升高。本文进一步探究了该关联，并纳入了更高固结剪应力下的试验结果。试验结果与既往关联一致，且进一步揭示：当角度差处于0°至90°区间时，增大固结剪应力会降低非共轴性水平；而当角度差处于90°至180°区间时，增大固结剪应力则会提升非共轴性水平。