【摘 要】
：
基于数字图像相关法(DIC)建立砂土直剪测量系统,利用该系统可直接获取砂的位移场,应变场等信息.为验证测量系统的有效性和可行性,对直剪试验过程中福建平潭标准的剪切位移-剪
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基于数字图像相关法(DIC)建立砂土直剪测量系统,利用该系统可直接获取砂的位移场,应变场等信息.为验证测量系统的有效性和可行性,对直剪试验过程中福建平潭标准的剪切位移-剪应力关系曲线和抗剪强度曲线,并获得了该标准砂的C,φ值,并与传统土工试验结果进行对比.在垂直压力100kPa,剪切速度12转/分时,利用CCD摄像机采集连续直剪过程中标准砂的变形信息,采样频率为0.5秒/幅.利用数字图像相关方法软件对采集得到的变形图进行计算并获得砂土颗粒的位移,速度,应变和砂颗粒的运动方向等微细观变形信息.为后续砂土力链演变规律及宏观力学性能的研究提供了可视性的试验依据.
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