The direct shear apparatus amended from the RMT-150B system is adopted to conduct the direct shear test on the coarse sand with the water contents of 0%, 8%,16% and 24%, respectively. The contact surfaces with four kinds of concrete basements with different roughness and strengths under different normal stresses are considered. The results have proved that the ultimate shearing strength under high stress increases with the normal stress. The shearing rigidity decreases with the shear displacement development while the initial shearing rigidity decreases when the normal stress increases. The shear displacement keeps increasing as the roughness of the contact surface grows up to a normal stress of 2 MPa. The initial shearing rigidity of the dry sand with the water content of 0% is greater than that of the wet sand under the same normal stress. Regression analysis based on the experimental data shows that the displacement for the contact surface between the coarse sand and concrete under the high-stress direct shear conditions can be described via the hyperbolic model. In addition, the ultimate and initial shearing strength of the contact surface can be estimated through the regression parameters. It has been shown that the ultimate shearing strength is the most significantly influenced by the normal stress followed by the roughness of the contact surface, and the influence of the water content is slightly greater than the strength of the concrete interface. The relative crushing ration of particles is subjected to the significant influence from the normal stress, followed by the water content and basement hardness and the influence from the contact surface roughness is minimum. In addition, the relative crushing ratio of particles increases as the normal stress develops and decreases while the concrete roughness and basement hardness become smaller. The peak of the existing crush increased with the water content.