Effective stress based numerical modelling of shallow foundations on unsaturated soil

2015 ◽  
pp. 635-640 ◽  
Author(s):  
Y Tang ◽  
H Taiebat
Keyword(s):  
Numerical Modelling ◽  
Effective Stress ◽  
Unsaturated Soil ◽  
Shallow Foundations

Numerical Modelling and Laboratory Experiments of Tritium Transport in Unsaturated Soil

2002 ◽  
Vol 41 (3P2) ◽  
pp. 464-469 ◽  
Author(s):  
Jun Koarashi ◽  
Takao Iida ◽  
Mariko Atarashi-Andoh ◽  
Hiromi Yamazawa ◽  
Hikaru Amano
Keyword(s):  
Numerical Modelling ◽  
Unsaturated Soil ◽  
Laboratory Experiments ◽  
Tritium Transport

Settlement rate of foundations on unsaturated soils

1999 ◽  
Vol 36 (5) ◽  
pp. 940-946 ◽  
Author(s):  
Ernesto Ausilio ◽  
Enrico Conte
Keyword(s):  
Volume Change ◽  
Unsaturated Soil ◽  
Unsaturated Soils ◽  
Shallow Foundations ◽  
Settlement Rate ◽  
One Dimensional ◽  
Consolidation Rate ◽  
Degree Of Consolidation ◽  
The One ◽  
External Loads

This paper deals with the one-dimensional consolidation of unsaturated soils due to the application of external loads. A simple equation is derived that enables one to predict the rate of settlement of shallow foundations with time. This equation uses the constitutive relationships proposed by Fredlund and Morgenstern to define the volume change of unsaturated soils, and relates the settlement rate to the average degree of consolidation for both the water and air phases. A series of examples is shown to demonstrate the feasibility and usefulness of the derived equation. Key words: one-dimensional consolidation, unsaturated soil, degree of consolidation, rate of settlement.

A column study of static nonequilibrium fluid pressures in sand during prolonged drainage

1994 ◽  
Vol 31 (2) ◽  
pp. 299-303 ◽  
Author(s):  
S. Lee Barbour ◽  
Ernest K. Yanful
Keyword(s):  
Hydraulic Conductivity ◽  
Numerical Modelling ◽  
Unsaturated Soil ◽  
Fluid Pressure ◽  
Coarse Sand ◽  
Residual Water ◽  
Residual Saturation ◽  
Sand Column ◽  
Soil Systems ◽  
Theoretical Analyses

In the design of layered soil systems, such as the design of liners or covers over unsaturated soil, a key design concern is the magnitude of negative fluid pressure that will develop along the base of the liner or cover. In the absence of evaporation or vapour migration, the maximum negative fluid pressures will develop near the cessation of drainage. Previous theoretical analyses and numerical modelling of these systems have indicated that this pressure will be the pressure at which an underlying sand reaches its residual water content. The hydraulic conductivity of the sand at these pressures is so small that "static" nonequilibrium pressures are sustained over long periods of time. In this note, laboratory verification is provided for the magnitude of these pressures based on drainage of a fine and coarse sand column. Key words : covers, liners, air-entry value, residual saturation, layering, drainage.

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