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引入两类超固结比的概念,对不同围压下,具有两类不同超固结比的饱和原状、重塑黄土试样进行三轴固结不排水剪切试验。结合应力分担率的定义对试验所得的应力-应变曲线进行整理,获得了应力分担率随应变水平呈两阶段变化的特征曲线。定义结构性发挥系数对应力分担率曲线进行归一化处理。结果表明:两类超固结比下,相同围压、具有不同超固结比的试样的结构性发挥系数演化规律具有很好的归一性;不同固结围压时,两类超固结比下,该系数也同样具有很好的归一性。由此提出了描述结构性演化规律的计算模式和相应的理论计算公式。结构性发挥系数的理论公式为一个3段式函数,形式简单、参数少,且具有较好的稳定性。对比分析表明:计算和试验结果具有很好的一致性。
The concept of two types of overconsolidation ratio was introduced. Three-axis consolidation undrained shear tests were conducted on saturated intact and remolded loess samples with two different types of overconsolidation ratios under different confining pressure. According to the definition of stress sharing rate, the stress-strain curve obtained from the experiment is sorted out, and the characteristic curve of the stress sharing rate changing in two stages with strain level is obtained. Define the structural play coefficient to normalize the stress share curve. The results show that the structural evolution coefficient of the samples with the same confining pressure and different overconsolidation ratios has good normalization under two kinds of overconsolidation ratios. The ratio, the coefficient also has a good normality. Therefore, a calculation model describing the structural evolution and a corresponding theoretical calculation formula are proposed. The theoretical formula of structural play coefficient is a 3-stage function, which has the advantages of simple form, few parameters and good stability. The comparative analysis shows that the calculation and test results have good consistency.