Stability Analysis of Road Embankment Slope Subjected to Rainfall Considering Runoff-Unsaturated Seepage and Unsaturated Fluid–Solid CouplingReport as inadecuate




Stability Analysis of Road Embankment Slope Subjected to Rainfall Considering Runoff-Unsaturated Seepage and Unsaturated Fluid–Solid Coupling - Download this document for free, or read online. Document in PDF available to download.

International Journal of Civil Engineering

pp 1–12

First Online: 12 May 2017Received: 26 April 2016Revised: 20 July 2016Accepted: 28 December 2016DOI: 10.1007-s40999-017-0194-7

Cite this article as: Liu, J., Yang, C., Gan, J. et al. Int J Civ Eng 2017. doi:10.1007-s40999-017-0194-7

Abstract

Rainfall is an important triggering factor influencing the stability of soil slope. Study on some influences of the rainfall on the instability characteristics of unsaturated soil embankment slope has been conducted in this paper. First, based on the effective stress theory of unsaturated soil for single variable, fluid–solid coupling constitutive equations were established. Then, a segment of red clay embankment slope, along a railway from Dazhou to Chengdu, damaged by rainfall, was theoretically, numerically, and experimentally researched by considering both the runoff-underground seepage and the fluid–solid coupling. The failure characteristics of the embankment slope and the numerical simulation results were in excellent agreement. In the end, a sensitivity analysis of the key factors influencing the slope stability subjected to rainfall was performed with emphasis on damage depth as well as infiltration rainfall depth. From the analysis in this paper, it was concluded that the intensity of rainfall, rainfall duration, and long-term strength of soil have most effects on slope stability when subjected to rainfall. These results suggest that the numerical simulation can be used for practical applications.

KeywordsEmbankment slope Unsaturated soils Single variable Runoff Rainfall filtration Abbreviations\{u {\text{a}}} - {u {\text{w}}}\Matrix suction

\Coefficient of roughness

\g\Acceleration of gravity

\u\Velocity of the flow

\q\Water flow volume rate

\\alpha\Slope angle

\\beta\Rainfall direction

\I\Rainfall intensity

\{S {\text{a}}}\ and \{S {\text{w}}}\Mean saturation of air and water

\{H^{\text{a}}}\ and \{H^{\text{w}}}\Air head and water head

\{q {\text{a}}}\ and \{q {\text{w}}}\The sources of air and water

\{ ho {\text{a}}}\ and \{ ho {\text{w}}}\Densities of air and water

\\mu\Dynamic viscosity

PPore pressure

\\xi\Fluid volume change

\{q {\text{v}}}\Volume strength of the fluid source

\{K {\text{w}}}\ and \{K {\text{a}}}\Bulk modulus of fluid and air

\\varepsilon\Volumetric strain

\ ho\Volume density

\\Delta \sigma ^{\prime} {{ij}}\Change of the effective stresses

\\kappa\Parameter of stress-paths.

HThe constitutive law’s functional form

\{C {\text{S}}}\Cohesion strength

\{\phi {\text{S}}}\Internal friction angle

\{\sigma - 1}\The maximum principal effective stresses

\{\sigma - 3}\The minimum principal effective stresses

\FOS\Factor of safety





Author: Junxin Liu - Chunhe Yang - Jianjun Gan - Yutian Liu - Liu Wei - Qiang Xie

Source: https://link.springer.com/



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