砂类土力学强度试验研究

Experimental study on mechanical strength of sand soil

通过对砂土的抗剪强度试验结果进行统计,分析了砂土内摩擦角和粘聚力随不同颗粒粒组含量、密实度的变化趋势及规律。试验结果表明,随着砂粒组含量的增大,内摩擦角呈线性增大趋势;当粉粒和粘粒含量增加时,粘聚力亦呈线性增大趋势。同时,试样干密度的增大使内摩擦角和粘聚力呈线性增大。砂土中的粗粒和细粒含量变化存在一个对应的内摩擦角和粘聚力变化的区间。通过回归分析砂土抗剪强度与所含颗粒不同粒径、密实度关系,在特殊条件下,可以有效快速判定砂土剪切指标。

By adopting shear strength test of sand,the results are statistical analysis.Proceeding from the concept of composite soil,the sand with the different dry density and particle groups ratios are associated with internal friction angle and cohesive force to reveal the trend of shear strength.Experimental results indicate that internal friction angle is linear with the increasing sand group content,and the cohesion shows a linearly increase as silt and clay content increase.With the increase of dry density,an increase in internal friction angle and cohesive force are found.It is considered there is a corresponding range of internal friction angle and cohesive force change.Through regression analysis,the relationship between particle groups, density and sand shear strengthcan be quickly and effectively used to put forward the shear parameters in specific conditions.