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采用空心圆柱扭剪仪对干燥TJ-1模拟月壤试样进行了应力主轴固定的定向剪切试验及不同偏应力比时主应力方向的纯旋转试验。从应力-应变关系角度出发,研究主应力方向、偏应力比对其各向异性的影响,并探讨了上述因素对TJ-1模拟月壤非共轴性的影响。试验结果表明:主应力方向和偏应力比对TJ-1模拟月壤的各向异性均有显著影响;应力主轴旋转引起的非共轴现象比定向剪切时明显,且偏应力比较小时非共轴角随应力主轴旋转呈先减小后增加的趋势,偏应力比较大时非共轴角一直减小直至试样破坏时非共轴现象消失。上述成果可弥补干砂试样非共轴领域的研究空白,并可望为将来月球上基础设施的修建提供技术支持。
The hollow cylindrical torsional shear tester was used to conduct the directional shear test of fixed stress on the TJ-1 simulated lunar soil sample and the pure rotation test of different principal stress directions. Based on the stress-strain relationship, the influence of the principal stress direction and the deviatoric stress ratio on the anisotropy of the lunar soil is investigated, and the influence of these factors on the non-coaxiality of the lunar TJ-1 model is discussed. The experimental results show that the direction of principal stress and the ratio of deviatoric stress have a significant effect on the anisotropy of lunar soil simulated by TJ-1. The non-coaxial phenomenon caused by stress spindle rotation is more obvious than that under directional shearing, The axial angle decreases first and then increases with the rotation of the principal axis of stress. The non-coaxial angle decreases until the non-coaxial phenomenon disappears until the specimen destructs. The above results can make up for the non-coaxial dry sand research blank, and is expected to provide technical support for the future construction of the moon on the infrastructure.