Simulation of pore water pressure distribution in the slope soil layer with pipes clogged in different ways
2004
Tada, Y. (Tottori Univ. (Japan)) | Okumura, T. | Kubota, T. | Honda, N.
Summary For appropriate prediction of slope failure, we need an applicable model for water passages, especially of soil pipes in the soil layer. In this paper, we begin by illustrating the different aspects of pore water pressure distribution affected by soil pipes in model slopes, we then discuss the procedures and results of a numerical simulation of the raising process of pore water pressure by saturated and unsaturated infiltration analysis. Model experiments showed; (1) The soil pipe system functioned as a drain system to depress pore water, (2) The pipe system, plugged before rainfall began, become raised pore water pressure in the vicinity of the plug, and (3) The pipe system, being plugged after establishing a steady state of pore water pressure and discharge from the pipes by rainfall, raised pore water pressure around the plug by a large margin. These experimental results were simulated by saturated and unsaturated infiltration analysis. The pipes were replaced with an anisotropic soil layer of higher hydraulic conductivity horizontally. The calculated and measured results corresponded well. It can be shown to reproduce pore water pressure distribution on slopes that have soil pipes under different closed condition by saturated and unsaturated infiltration analysis. We conclude that saturated and unsaturated infiltration analysis which takes into consideration water paths can improve the prediction of slope collapse time.
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