偏应力比和应力主轴偏转角同时变化下饱和砂土变形特性研究
发布时间：2018-10-10 13:06
【摘要】：利用空心圆柱扭剪仪对饱和砂土进行了应力主轴固定和偏应力比增大(即定向剪切)、偏应力比不变和应力主轴单调旋转(即纯应力主轴单调旋转)、偏应力比和应力主轴偏转角同时增加、偏应力比和应力主轴偏转角分段增加4个系列的排水剪切试验,着重分析不同应力路径下饱和砂土的变形特性及主应力和主应变增量方向变化规律。试验结果表明,纯应力主轴单调旋转下,主应力增量方向在45°~135°范围内变化,主应变增量方向逐渐偏向主应力方向;偏应力比和应力主轴偏转角同时增加下,砂土变形不断增大,当主应力增量方向????45°时,主应变增量方向与主应力增量方向基本一致,但当????45°时,主应变增量方向逐渐偏离主应力增量方向。当应力状态在偏应力比?≤0.75、应力主轴偏转角?≤45°范围内时,体应变、最大剪应变与应力路径无关,且后期纯应力主轴旋转下砂土变形不受前期加载历史的影响。
[Abstract]:The hollow cylindrical torsional shear apparatus was used to fix the stress spindle and increase the deflection stress ratio (i.e. directional shear) of saturated sand. The deflection stress ratio was invariable and the stress spindle rotated monotonously (that is, the pure stress spindle rotated monotonously), and the deflection stress ratio was increased. The deflection angle of the force spindle increases at the same time, In this paper, four series of drainage shear tests are carried out to increase the deflection stress ratio and the deflection angle of the principal axis. The deformation characteristics of saturated sand under different stress paths and the variation law of principal stress and principal strain increment direction are analyzed. The experimental results show that the direction of principal stress increment changes in the range of 45 掳~ 135 掳, the direction of principal strain increment gradually deviates to the direction of principal stress, and the deformation of sand increases with the increase of the deflection stress ratio and the deflection angle of the stress spindle at the same time, when the pure stress spindle rotates monotonously, the direction of principal stress increment changes from 45 掳to 135 掳. When the principal stress increment direction is -45 掳, the principal strain increment direction is basically the same as the principal stress increment direction, but when the principal strain increment direction is -45 掳, the principal strain increment direction gradually deviates from the principal stress increment direction. When the stress state is in the range of deflection stress ratio 鈮，
本文编号：2261885
[Abstract]:The hollow cylindrical torsional shear apparatus was used to fix the stress spindle and increase the deflection stress ratio (i.e. directional shear) of saturated sand. The deflection stress ratio was invariable and the stress spindle rotated monotonously (that is, the pure stress spindle rotated monotonously), and the deflection stress ratio was increased. The deflection angle of the force spindle increases at the same time, In this paper, four series of drainage shear tests are carried out to increase the deflection stress ratio and the deflection angle of the principal axis. The deformation characteristics of saturated sand under different stress paths and the variation law of principal stress and principal strain increment direction are analyzed. The experimental results show that the direction of principal stress increment changes in the range of 45 掳~ 135 掳, the direction of principal strain increment gradually deviates to the direction of principal stress, and the deformation of sand increases with the increase of the deflection stress ratio and the deflection angle of the stress spindle at the same time, when the pure stress spindle rotates monotonously, the direction of principal stress increment changes from 45 掳to 135 掳. When the principal stress increment direction is -45 掳, the principal strain increment direction is basically the same as the principal stress increment direction, but when the principal strain increment direction is -45 掳, the principal strain increment direction gradually deviates from the principal stress increment direction. When the stress state is in the range of deflection stress ratio 鈮，
本文编号：2261885
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