TY - GEN

T1 - Microscopic modeling of shear strength of contaminated soils

AU - Ratnaweera, Prasanna

AU - Meegoda, Namunu J.

PY - 1991/1/1

Y1 - 1991/1/1

N2 - The degradation of shear strength of soils due to prolonged contamination of soils is an emerging problem. The experiments conducted at New Jersey institute of Technology showed a gradual reduction of the unconfined compressive strength and the modulus of the contaminated soils with the increase in the amount of contamination. It was also found that the pore fluid viscosity was responsible for the degradation of the shear strength and the change in stress-strain behavior. In this paper a theoretical explanation is provided for the above observations with the aid of a microscopic model for soils. The microscopic model TRUBAL (Strack & Cundall, 1984), a computer program which was developed to model dry granular assemblies of spheres in three dimension, was modified and used in this study. To adopt the above model for this research, the computer program was first modified to accommodate the pore pressure changes. In order to model the degradation of shear strength of soils due to chemical contamination, the pore fluid in the granular assembly was replaced with fluids of different pore fluid viscosities. The influence of pore fluid viscosities on the granular assembly was modeled by introducing the theory on converging-diverging wedges in basic lubrication theory. The results show that the modified microscopic model is capable of explaining the experimental observations.

AB - The degradation of shear strength of soils due to prolonged contamination of soils is an emerging problem. The experiments conducted at New Jersey institute of Technology showed a gradual reduction of the unconfined compressive strength and the modulus of the contaminated soils with the increase in the amount of contamination. It was also found that the pore fluid viscosity was responsible for the degradation of the shear strength and the change in stress-strain behavior. In this paper a theoretical explanation is provided for the above observations with the aid of a microscopic model for soils. The microscopic model TRUBAL (Strack & Cundall, 1984), a computer program which was developed to model dry granular assemblies of spheres in three dimension, was modified and used in this study. To adopt the above model for this research, the computer program was first modified to accommodate the pore pressure changes. In order to model the degradation of shear strength of soils due to chemical contamination, the pore fluid in the granular assembly was replaced with fluids of different pore fluid viscosities. The influence of pore fluid viscosities on the granular assembly was modeled by introducing the theory on converging-diverging wedges in basic lubrication theory. The results show that the modified microscopic model is capable of explaining the experimental observations.

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M3 - Conference contribution

AN - SCOPUS:0025841124

SN - 0872628043

T3 - Mechanics Computing in 1990's and Beyond

SP - 1204

EP - 1208

BT - Mechanics Computing in 1990's and Beyond

A2 - Adeli, Hojjat

A2 - Sierakowski, Robert L.

PB - Publ by ASCE

T2 - ASCE Engineering Mechanics Specialty Conference

Y2 - 20 May 1991 through 22 May 1991

ER -