掺砾对击实黏土剪切断裂韧度的影响

The Influence of Gravel Mixed to Shear Fracture Toughness of Clay

为了探究黏性土剪切断裂韧度特性,使用土体剪切断裂韧度测试仪,在掺入不同粒径大小的砂砾和不同含量砂砾的情况下,通过该仪器探究对土体剪切断裂韧度值的影响。试验结果表明:在土体中掺入砂砾能提高断裂韧度值,并且土体的剪切断裂韧度值随着掺砂量的增高而增高。但掺入不同大小的颗粒粒径的砂砾对断裂韧度值的影响效果是不同的。在相同含砂量下,掺入颗粒的粒径越大,其断裂韧度值提高的幅度越低。掺入砂砾对土体剪切断裂特性的影响特性可以通过砂砾与黏性土的混合土体结构组成来解释说明,其主要的影响作用机理有团粒化作用、填充作用和摩擦作用等3个方面。

In order to explore the shear fracture toughness of compacted clay, based on the fracture toughness test device, while the clay mixed with different particle size of gravel and different content of gravel, the impact of particle size and content on the fracture toughness was explored. The results of the analysis proved that mixed the clay with gravel can improve the fracture toughness values, and fracture toughness increased as the gravel＇ s content increased. With different particle size of gravel, effects on the fracture toughness value are different. Under the same gravel content, the fracture toughness increases at lower rate as particle size increases. Under the aggregation effect, filling effect and rubbing effect on the mixed soil structure of gravel and clay, the relationship between mixed gravel and fracture toughness characteristics explains.