花岗岩残积层滑坡形成机理降雨模拟研究. .

Granite residual soil is a kind of special soil, which is easy to induce geological disasters under the condition of heavy rainfall. Taking the mass landslides in Beiling area, Longchuan County, Guangdong Province as the background, the formation mechanism of typical landslides was explored by means of physical simulation. The results show as follows. The influencing factors of landslides are rainfall intensity, physical and mechanical properties of rock and soil mass, slope structure. Rainfall did not cause the abnormal increase or decrease of soil pressure and pore water pressure in the slope, indicating that the failure of the slope was limited to the local failure of the slope surface and the slope toe, and there was no overall deformation and failure trend. On the surface of the slope, the slope was eroded by rainfall, and on the foot of the slope, the free surface collapses and undergoes erosion. On the whole, the slope showed the characteristics of “step by step retreat and damage in turn”. The evolutionary process of landslide could be divided into the following four stages: original slope evolution stage, soil particle migration stage, slope surface local failure stage and overall instability stage. [ABSTRACT FROM AUTHOR]