单轴压缩土样剪切带上主应变轴偏转角的分布及规律统计

发布时间：2018-05-03 22:22

本文选题：土样 + 剪切带　；参考：《防灾减灾工程学报》2016年06期

【摘要】：根据土样纵向应变较高时最大剪切应变场中清晰剪切带所处位置沿剪切带方向布置平直测线,获得6条测线上从剪切带萌生至微裂纹刚出现过程中主应变轴偏转角的分布及演变规律,并对其进行了统计。研究发现:当微裂纹刚出现时,测线上主应变轴偏转角的高峰和低谷对应于2条共轭剪切带的交汇处附近或剪切带上最大剪切应变的局部高值区附近;在土样中部,剪切带上主应变轴偏转角主要分布在-5°~5°;随着纵向应变的增加,剪切带上主应变轴偏转角的标准差先降低,后趋于稳定;对于发生顺时针剪切的剪切带,主应变轴偏转角的均值主要为负值,而对于发生逆时针剪切的剪切带,主应变轴偏转角的均值以正值为主。
[Abstract]:According to the position of the clear shear band in the maximum shear strain field when the longitudinal strain of the soil sample is high, the horizontal measuring lines are arranged along the direction of the shear band. The distribution and evolution of the principal strain axis deflection angle from the initiation of shear band to the emergence of microcracks on six measuring lines are obtained and the statistics are made. It is found that the peak and trough of the principal strain axis deflection angle on the measuring line correspond to the intersection of the two conjugate shear bands or the local high value region of the maximum shear strain of the shear band when the microcracks appear, and in the middle of the soil sample, With the increase of longitudinal strain, the standard deviation of the axial deflection angle of the main strain in shear band decreases first and then tends to be stable. For the shear zone with clockwise shear, the axial deflection angle of the main strain is mainly distributed in -5 掳or 5 掳, and the standard deviation of the axial deflection angle of the main strain in the shear band decreases first and then tends to be stable. The mean value of the principal strain axis deflection angle is mainly negative, but for the shear band with counterclockwise shear, the mean value of the principal strain axis deflection angle is mainly positive.
【作者单位】：辽宁工程技术大学计算力学研究所;辽宁工程技术大学力学与工程学院;
【基金】：国家自然科学基金项目(51574144) 辽宁省高等学校优秀人才支持计划项目(LR2015029) 辽宁省科学事业公益研究基金项目(2014003008) 高等学校博士点专项科研基金项目(20132121110006)资助
【分类号】：TU435

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