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http://dx.doi.org/10.7843/kgs.2017.33.12.93

Model Tests and GIMP (Generalized Interpolation Material Point Method) Simulations of Ground Cave-ins by Strength Reduction due to Saturation  

Lee, Minho (Dept. of Civil and Environmental Engrg., Seoul National Univ.)
Woo, Sang Inn (Institute of Engrg. Research, Seoul National Univ.)
Chung, Choong-Ki (Dept. of Civil and Environmental Engrg., Seoul National Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.33, no.12, 2017 , pp. 93-105 More about this Journal
Abstract
This study presents direct shear tests, model tests, and numerical simulations to assess the effect of reduction of soil strength because of saturation during formation of ground cave-in caused by damaged sewer pipe lines. The direct shear test results show that the saturation affects the cohesion of soil significantly although it does not influence the friction angle of soil. To experimentally reproduce ground cave-in, the model tests were performed. As ground cave-ins were accompanied with extreme deformation, conventional finite element method has difficulty in simulating them. The present study relies on generalized interpolation material point method, which is one of meshless methods. Although there are differences between the model test and numerical simulation caused by boundary conditions, incomplete saturation, and exclusion of groundwater flow, similar ground deformation characteristics are observed both in the model test and numerical simulation.
Keywords
Ground cave-in; Model tests; Large deformation; Numerical simulation; Generalized interpolation material point method;
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