基于智慧集料运动特征的级配碎石剪切破坏机理

Investigation on the Shear Failure Mechanism of Graded Crushed Stone Based on the Smart-rock Motion Characteristics

为深入了解级配碎石混合料剪切破坏机理,研发了智慧集料传感系统,结合级配碎石三轴剪切试验,进行智慧集料运动特征指标与级配碎石剪切行为的关联分析。基于剪切破坏位置,选择了智慧集料埋设位置;以x、y、z三轴方向加速度和角度指标表征智慧集料运动特征。研究结果发现:智慧集料加速度和角度响应规律与级配碎石剪切破坏三阶段变化规律吻合:级配碎石剪切破坏过程中,智慧集料加速度响应经历了由运动缓慢,运动加快到运动突变稳定的变化;且y、z轴方向加速度变化更快。智慧集料角度响应证明了集料颗粒接触各向异性存在,x、y、z三轴方向角度响应差异性大;颗粒转角运动最终主要体现在x、y轴方向上。

In order to reveal the shear failure mechanism of graded crushed stone, a smart-rock sensing system was developed. Combining with the triaxial shear test, the correlation analysis between smart-rock motion characteristic indexes and shear behavior of graded crushed stone was carried out. Based on the shear failure location, the embedded location of smart-rock was selected. The motion characteristics was evaluated by x, y and z axis acceleration and angle indexes. Results show that the acceleration and angular response of smart-rock are consistent with the three-stage variation of graded crushed stone shear failure. During the process of shear failure, the acceleration response of smart-rock experienced a change from slow motion, accelerated motion to abrupt and stable motion, and the acceleration changes faster in the y and z directions. The angular response of smart-rock proves that anisotropy of aggregates contacts, and the angular response of x, y and z axes has great difference. The angular response of aggregates is mainly produced in the x and y axes.