Experimental Study on Infiltration Characteristics and Microstructure of Soil Slopes Under Severe Heavy Rainfall Conditions

Abstract:

The permeability of the soil along the railway during rainfall directly affects the stability and safety of the railway embankment. To investigate the influence of different regions and slopes, this study combined high-precision industrial CT microscopic equipment, three-dimensional reconstruction models, and on-site artificial rainfall simulation experiments to conduct in-depth analysis of the infiltration chara-cteristics of soil slopes under extreme rain conditions and the microscopic properties of soil pores. The results show that during continuous rainfall, within the range of 5° to 50° slopes, the infiltration and water absorption capacity of the slope gradually decreases and then stabilizes; the porosity at the Shiheshou Tunnel is approximately 29%, with larger sand particles, and the porosity in the Wen Tang Station area is approximately 19%, with relatively smaller particle sizes. The soil at Shiheshou has a stronger permea-bility. From a microscopic perspective, under the same conditions, the larger the equivalent radius of pores and pore throats in the soil and the greater the coordination number, the larger the soil permeability coefficient; the longer the pore length, the smaller the soil permeability coefficient.