Abstract
The annual rainfall in tropical rain forests in Africa is concentrated, and the abundant rainfall can easily lead to roadbed landslides. Therefore, it is necessary to analyze the impact of rainfall on the stability of roadbeds. This paper first uses the pore fluid permeability/stress coupling analysis step provided by ABAQUS to calculate the impact of rainfall infiltration on the overall stability of the roadbed slope and then discusses the rainfall infiltration on the slope seepage field, stress field, and displacement combined with the strength reduction method and the influence of field and safety factors. In the end, it is concluded that the 72-hour rainfall with an intensity of 50 mm/d will reduce the safety factor of the roadbed by 4.9% compared with before the rainfall. At the same time, it will increase the internal pore water pressure of the roadbed, reduce the suction of the matrix, and reduce the effective stress, which is caused by various factors. The overall stability of the roadbed is reduced.
Highlights
Introduction eYadu expressway project is the most convenient fast track connecting Cameroon’s political capital Yaoundeand the economic capital Douala, and it is an important part of the cargo transshipment channel for inland countries such as Central Africa
Amplitude 0 1 1 0 rainfall infiltration is performed by adding the infiltration analysis steps and rainfall, and the stress field and displacement field of the red clay roadbed under rainfall conditions are obtained
After the analysis of slope seepage field and stress field in the above chapter, it can be concluded that the change of suction caused by rainwater infiltration is the key factor influencing the overall stability of roadbed by rainfall
Summary
Studying the interaction relationship between moisture content and the mechanical properties of unsaturated soils can realize the analysis of the influence of the internal pore water pressure and saturation of the subgrade in Africa on the overall stability of the subgrade in seasonally flooded subgrades. It can be seen from the above that, in unsaturated soil, soil moisture content and matrix suction, permeability coefficient and matrix suction, permeability coefficient, and moisture content are closely related. Is paper uses the strength reduction method to analyze the high liquid limit red clay roadbed in Africa and explores the changing law of the safety factor of the slope after rainfall.
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