Experimental Study on the Interface Characteristics of Reinforced Crushed Rock Cushion Layer Based on Direct Shear Tests

Abstract

Through indoor large-scale direct shear tests, the interface characteristics of the crushed rock cushions layer reinforced with ParaLink geogrid were studied. The test results indicate that the shear strength of the crushed rock aggregate and the interface strength parameters have a non-linear relationship with the normal stress. The addition of the geogrid reduces the shear strength of the crushed rock aggregate and the interface strength parameters, which is mainly due to the relatively large size, small thickness, and high smoothness of the geogrid. The reinforced geogrid has a significant impact on the deformation and fragmentation characteristics of the crushed rock aggregate. It effectively suppresses the shear contraction and shear dilation effects of the crushed rock aggregate, reducing its peak compression and peak dilation angle. Furthermore, it inhibits the tendency of particle fragmentation in the crushed rock aggregate.

Review of Sensor-Based Subgrade Distress Identifications

“…Subgrade slope collapse refers to the situation in which the geological structure of the subgrade slope is damaged, deformed, and slipped at the road slope due to human or natural factors, which leads to the instability or decline of the subgrade slope [74]. Poor design and construction quality of subgrade slope, improper control of parameters such as verticality, levelness, slope and standard thickness, large earthwork excavation, and poor supporting measures, or natural disasters such as rainfall, flood, landslide, and earthquake will also have an important impact on subgrade slope, which will lead to the problem of subgrade slope collapse.…”

Research on the interface characteristics of coal gangue with different geosynthetic reinforcements

“…YI et al [15] studied the influence of interface types on shear characteristics, concluding that they conformed to the Mohr-Coulomb strength theory, with the apparent friction angle of the interface composed of sliding and interlocking friction angles. Through large-scale direct shear tests, WANG et al [16] examined the interface properties of gravel layers reinforced with geogrids, finding a nonlinear relationship between the shear strength of gravel aggregates and interface strength parameters with normal stress. Including geogrids reduced the shear strength of gravel aggregates and the interface.…”