中文摘要：

为了探明含石量对土石混合体边坡渐进破坏的影响,进行了5种不同含石量边坡的静力超载试验。在加载过程中测得作用于边坡顶部的力和位移,同时采集边坡侧面的高清图像。通过对比PIV（particle image velocimetry）分析结果与FLAC~（3D）数值模拟结果揭示了边坡在静力超载作用下的破坏过程并表明PIV分析结果能够体现土石混合体中砾石对剪切带的影响。对比不同含石量边坡的PIV分析结果,发现剪切带都呈＂y＂型,但含石量对剪切带的发展有重要影响。随着含石量增加,一方面剪切带受砾石影响而逐渐呈现偏转和曲折的特点,并发现剪切带发展过程中的两种＂绕石＂模式;另一方面,边坡破坏模式从整体破坏到局部分级破坏逐渐过渡,破坏模式的转折点位于含石量30%~53%的区间内。

英文摘要：

In order to investigate the effect of rock proportion on the progressive failures of soil-rock-mixture slope,five static overload tests are conducted on soil-rock-mixture slope with different rock proportion.In the course of the tests,the load and displacement of the load plate that acting on the top of the slope are measured.Meanwhile,the side slope is monitored by a high-definition image capturing system.The comparison of results between particle image velocimetry（PIV） analysis and the FLAC~（3D）numerical simulation reveals the failure process of the slope under static overload.,The PIV analytic results indicates that the rock blocks affect the shear band development.Through a comparison of PIV analytic results with different rock proportion,all the slopes develop Y-shaped shear band.As the rock proportion increases in the slope,on the one hand,the shear band affected by the gravel gradually shows deflection and twists,and two propagation modes are developed in the shear zone;on the other hand,the failure mode of the slopes gradually changes from general shear failure to local failure mode with rock proportion in range of 30%-53%.