【摘要】 PIV(Particle image velocimetry)技术在流场试验和土体静力变形试验中已经得到了广泛应用,并取得了良好的测试分析效果。但在大型振动台模型试验中的应用还未见发表。结合边坡稳定大型振动台模型试验,对PIV技术在大型振动台模型试验中的应用进行了探索,并对边坡失稳的判别准则进行了分析。分别采用SONY高清数码摄像机、MVC高分辨率摄像头和CANON数码单反相机进行图片采集。结果发现高清数码相机所采集的照片能够为PIV技术提供较好的支持。图片分析结果表明:PIV测量技术能较好地测定大型振动台模型试验中观察面内任意点在任意时刻的位移,可以获得丰富的边坡变形直至破坏的完整过程,从而可以深入地研究地震作用下边坡变形发展、应变局部化形成及其与边坡破坏过程的关系。通过对位移时程曲线的分析表明,位移曲线曲率判别法能较准确判别边坡失稳时刻。更多还原

【Abstract】 PIV is a velocity-measuring technique commonly used in the field of experimental fluid mechanics and geotechnical tests,but no previous report is found on the use of this technique in large-scale shaking table tests.The PIV technology is applied to large-scale shaking table model tests on slope stability,and the failure criterion is also studied.Sony high-definition video camera,MVC3000 camera and Canon EOS 450D digital camera are used to capture images.It is found that Canon digital camera can provide the best quality images and the measured results exhibit good regularity.The results show that the PIV technology is verified to effectively measure the displacement of any point at any time with accuracy within the observation region.Furthermore,one can get more information about the process of deformation development,the formation of strain localization and the whole failure process of slope under earthquakes.The maximum curvature criterion of the displacement-time curve can be used to predict the time of sliding of slopes.更多还原