论文部分内容阅读
利用大型动三轴试验设备,针对3种堆石料进行了考虑周围压力、固结比以及动应力幅值影响的排水动三轴压缩试验,探讨了动力荷载作用下筑坝堆石料的颗粒破碎特性。研究表明:在循环荷载作用下,堆石料颗粒破碎率随母岩强度的提高而降低,随围压、固结比及动应力幅值的增加而增加;根据动三轴试验过程,在进行颗粒破碎分析时应将堆石料颗粒破碎的产生分为4个阶段予以分别考虑;堆石料在动荷载施加前的已有颗粒破碎状态及应力水平对其后续的颗粒破碎特性具有一定的影响,动力加载过程中试样的体积收缩能够在一定程度上反映这一过程中颗粒破碎率的变化。
With the large-scale moving triaxial test equipment, the triaxial compression tests of draining water considering the surrounding pressure, consolidation ratio and dynamic stress amplitude were carried out for the three types of rockfill materials. The particle crushing properties of rockfill materials under dynamic load were discussed . The results show that the crushing rate of rockfill material decreases with the increase of parent rock strength under cyclic loading, and increases with the increase of confining pressure, consolidation ratio and dynamic stress amplitude. According to the dynamic triaxial test, In the crushing analysis, the crushing of the rockfill materials should be divided into four stages to be considered separately; the existing crushed state and stress level of the rockfill material before the dynamic load is applied have certain influence on the subsequent crushing characteristics of the particles, and the dynamic loading The volumetric shrinkage of the sample during the process can reflect the change of the particle breakage rate in this process to a certain extent.