Study of Bedrock Surface Effect under Different Percentages of Rock

The laws of deformation and failure of soil and rock mixtures under different percentages of rock were analyzed in this study, while considering the percentage of rock of the bedrock surface effect. Firstly, the intersection angle of bedrock surface and shearing surface was studied using an in-house developed large shear test. The maximum shearing stress change law was studied under different percentages of rock. The change laws of the pore water pressure and earth pressure were studied using the pore water pressure gauges and earth pressure gauges. The results showed that the shearing strength of the soil and rock mixtures increased under the same shearing displacement as the percentage of rock increased from 10% to 50%, the intersection angle of bedrock surface and shearing surface increased by 80%; the distance of the bedrock surface and shearing surface increased by 63.6% at the bottom of the bedrock surface as the percentage of rock increased; the maximum shearing stress increased by 32.5% as the percentage of rock increased; the time increased by 78.9% when the pore water pressure change value reached the corresponding maximum value as the percentage of rock increased. The time increased by 80% when earth pressure change value reached the corresponding maximum value as the percentage of rock Increased. The rock rotated, but the remained undamaged. The rock pointed to the shearing failure direction of soil and rock mixtures.