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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。
In order to find out the effect of rock mass on the gradual destruction of slope, a static overload test was carried out on five different stone-containing slopes. During loading, forces and displacements acting on the top of the slope were measured while a high-definition image of the side of the slope was acquired. By comparing the PIV (particle image velocimetry) analysis results with the FLAC 3D numerical simulation results, the failure process of the slope under the static overloading is revealed and the results of PIV analysis can reflect the influence of the gravel on the shear band in the soil-rock mixture . Comparing the results of PIV analysis of different rock mass containing slopes, it is found that the shear bands are all “y” type, but the stone content has an important influence on the development of shear zones. With the increase of the content of rock, on the one hand the shear zone is gradually influenced by the gravel and is gradually deflected and tortuosity, and two kinds of “stone” modes are found during the development of the shear zone; on the other hand, The model gradually transitions from the overall destruction to the localized graded destruction, and the turning point of the destruction model lies in the range of 30% -53% of the stone content.