Effect of slope on shrinkage cracking of granite residual soil and horizontal infiltration
A large number of shallow cracks exist on the surface of slopes in the erosion zone.To investigate the drying shrinkage and cracking characteristics of residual granite soil and their effects on horizontal infiltration(parallel to the slope)under different slope angles,the horizontal infiltration process and cracking characteristics of residual granite were comprehensively analyzed soil under different slope angles,as well as the influence of cracks on infiltration and runoff and sediment yield through indoor infiltration and cracking tests.The results showed that the cumulative infiltration increased with the increase of slope angle,while the wetting front migration distance decreased with the increase of slope angle.The presence of slope angle caused the soil sample to first crack at the junction between the slope top and the test box and then develop along the crack wall to 1/3 to 1/2 of the length of the soil sample,and the angle between the crack and the test box was 25°-55°.The slope angle promoted the extension of crack length and width,and reduced the degree of soil fragmentation.Slope angle and crack form affected the runoff and sediment yield of the crack soil.The increase in slope angle increased the water flow velocity and promoted sediment and runoff yield.The erosion of cracks parallel to the infiltration direction was slower,while the erosion of cracks at a certain angle to the infiltration direction was opposite.The independent soil blocks would be eroded into an"umbrella"shape and then collapsed due to the gravity and water erosion.
granite residual soilslopeinfiltrationcrackingrunoff and sediment production
万方数据
维普
