土石混合体通常是构成库区边坡、滑坡及坝基的主要岩土体材料，其物理力学性质要较一般的土体或岩体更复杂，是目前岩土力学及地质工程界共同面临的难题。通过制备一定含石量的土石混合体试样进行无侧限条件下单轴压缩试验，研究了碎石对土石混合体单轴压缩强度及变形破坏模式的影响;结合数值模拟方法，进一步分析碎石分布对土石混合体整体强度的影响机制。研究成果表明土石混合体的单轴抗压强度及变形破坏特征受含石量及碎石分布的控制，随着含石量的增加，单轴抗压强度降低，破坏模式由单裂纹开裂变为多裂纹开裂破坏，同时裂纹贯通时间有所增加。
Abstract
Soil-rock mixture is usually the main material for reservoir slope, landslide and dam foundation. The physical and mechanical properties of soil-rock mixtureare more complicated than common soil mass or rock mass, which is a difficult problem for researchers in the fields of rock mechanics, soil mechanics and geological engineering. In order to study the effect of gravel on uniaxial compressive strength and the mode of deformation failure of soil-rock mixture, we carried out unconfined uniaxial compression test by making mixture with certain rock block proportion. Combined with numerical method, the effect of spatial distribution of gravel on mixture’s overall strength was analyzed. The results show that, rock block proportion and spatial distribution of gravel have significant impact on uniaxial compressive strength and characteristics of deformation failure in soil-rock mixture. Uniaxial compressive strength declines with the increase of rock block proportion, at the same time, failure mode changes from single-crack failure to multi-crack failure, and time of propagation and coalescence of cracks increases.
关键词
土石混合体 /
碎石含量 /
碎石分布 /
破坏模式 /
单轴抗压强度
Key words
soil-rock mixture /
gravel content /
gravel distribution /
failure mode /
uniaxial compressive strength
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