Experimental study on slope sliding and debris flow evolution with and without barrier

Abstract

A constitutive model on the evolution of debris flow with and without a barrier was established based on the theory of the Bingham model. A certain area of the Laoshan Mountain in Nanjing, Jiangsu Province, in China was chosen for experimental study, and the slope sliding and debris flow detection system was utilized. The change curve of the soil moisture content was attained, demonstrating that the moisture content of the shallow soil layer increases faster than that of the deep soil layer, and that the growth rate of the soil moisture content of the steep slope is large under the first weak rainfall, and that of the gentle slope is significantly affected by the second heavy rainfall. For the steep slope, slope sliding first occurs on the upper slope surface under heavy rainfall and further develops along the top platform and lower slope surface, while under weak rainfall the soil moisture content at the lower part of the slope first increases because of the high runoff velocity, meaning that failure occurring there is more serious. When a barrier was placed at a high position on a slope, debris flow was separated and distributed early and had less ability to carry solids, and the variation of the greatest depth of erosion pits on soil slopes was not significant.

Research progress and prospect of gravity erosion in loess region

“…Zhang et al [13] and Qin [14] used the method of combining 3D laser scanning technology and Cylone6.0 to monitor the terrain changes in the indoor simulated rainfall test process, and generated a terrain DEM accuracy of 2mm×2mm under gully erosion condition, and the calculation accuracy of erosion amount reached 96.85%. Huo et al [15] , Zhao et al [16] using 3 d laser scanner to monitor the interior more than the same slope rill erosion under the condition of rainfall simulation, the dynamic process of using the generate DEM has realized the rill plane density, maximum average long groove depth, groove, groove more than average density and erosion intensity erosion topographic index calculation.…”