论文部分内容阅读
通过双孔隙结构分析结果确定在同一基质吸力下的试样将因孔隙分布的随机性而表现出不同的平衡饱和度,进一步通过理想非饱和土的水气分布确定饱和度差异将影响非饱和土的力学性质研究。采用压力板仪与直剪仪的简化组合试验对上述理论分析结果进行验证,研究结果表明:平衡饱和度差异存在并随着基质吸力的增大而逐渐减小;在同一基质吸力下试样的抗剪强度随平衡饱和度的增加而降低;进一步的拟合结果显示平衡饱和度对与基质吸力相关的内摩擦角影响显著;通过对试验数据及其平均值的研究建议在最小与最大基质吸力下进行多次平行试验,可以在不显著增加试验时间的同时减小平衡饱和度差异的影响。
Through the analysis of double-porosity structure, it is confirmed that samples under the same substrate suction will show different equilibrium saturations due to the random distribution of pore distribution. Further, determining the saturation difference through the moisture distribution of the ideal unsaturated soil will affect the unsaturated soil Mechanical properties of the study. The theoretical analysis results are verified by the simplified combination test of pressure plate and straight shears. The results show that: the difference of equilibrium saturation exists and decreases with the increase of substrate suction; in the same substrate suction The shear strength decreases with the increase of equilibrium saturation. Further fitting results show that equilibrium saturation has a significant influence on the internal friction angle related to substrate suction. Based on the experimental data and its average, it is suggested that the minimum and maximum substrate suction Performing multiple parallel tests can reduce the impact of differences in balance saturation without significantly increasing the test time.