Unsaturated Soil Consolidation Theory and Laboratory Experimental Data

2008 ◽  
pp. 154-154-16 ◽  
Author(s):  
DG Fredlund ◽  
H Rahardjo
Keyword(s):  
Experimental Data ◽  
Unsaturated Soil ◽  
Soil Consolidation ◽  
Consolidation Theory

Consolidation thermique par chaleur d'un sol non saturé

1991 ◽  
Vol 28 (1) ◽  
pp. 42-50 ◽  
Author(s):  
C. Saix
Keyword(s):  
Unsaturated Soil ◽  
Constitutive Law ◽  
Saturated Soils ◽  
Soil Consolidation ◽  
Thermal Compression ◽  
Triaxial Apparatus ◽  
Thermal Consolidation ◽  
Sol Non Saturé ◽  
Temperature Parameter ◽  
Definition Of

The thermal consolidation by heating of an unsaturated silty soil is studied by means of six tests performed in a thermal triaxial apparatus. The results show the importance of the temperature parameter and a clear similarity with the classical consolidation tests on saturated soils. A constitutive law is proposed for the thermal consolidation by heat that allows the definition of indices of thermal compression. This law is used to calculate the displacements in an unsaturated fill for heat storing. Key words: unsaturated soil, consolidation, heat, triaxial, modelling. [Translated by the Journal]

Research on the Consolidation Theory of Sand Drain Foundation Settlement

2011 ◽  
Vol 378-379 ◽  
pp. 282-287
Author(s):  
Wei Dong Pan ◽  
Xiao Long Sheng ◽  
Ren Guo Gu ◽  
Ke Zhu
Keyword(s):  
Water Level ◽  
Groundwater Level ◽  
Dissipation Rate ◽  
Field Measurements ◽  
Theoretical Research ◽  
Foundation Settlement ◽  
Soil Consolidation ◽  
Consolidation Process ◽  
Consolidation Theory ◽  
Groundwater Level Changes

In the consolidation theory of sand drain foundation settlement, the influence of groundwater level changes on the soil consolidation has been paid less attention. Therefore, discussing those changes' influence will help to deepen and perfect the sand drain consolidation theory. Through theoretical research and field measurements, the concrete influences of water level weight, dissipation rate and other factors on the consolidation process are obtained. This helps to improve the consolidation theory and efficiency.

scholarly journals Analysis of the Foundation Slab Settlement of the “Africa Pavilion” Facility in Wrocław

2015 ◽  
Vol 37 (4) ◽  
pp. 47-55
Author(s):  
Eugeniusz Sawicki ◽  
Tomasz Strzelecki
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Calculations ◽  
Soil Consolidation ◽  
The Finite Element Method ◽  
Two Phase ◽  
Foundation Slab ◽  
Consolidation Theory ◽  
Phase Medium ◽  
Biot’S Consolidation

Abstract This article presents the results of numerical calculations of soil consolidation underneath the “Africa Pavilion” structure in Wrocław Zoo, Poland. To determine the deformations of the baseplate of the “Africa Pavilion” and deformations of the subsoil, Biot’s consolidation theory for two-phase medium was applied. The calculations were carried out using the professional program FlexPDE v.6, which is based on the Finite Element Method. Numerical calculations performed were used to evaluate the design assumptions allowing for the laying of hydraulic conduits under the slab.

scholarly journals Improved Double-Layer Soil Consolidation Theory and Its Application in Marine Soft Soil Engineering

2019 ◽  
Vol 7 (5) ◽  
pp. 156 ◽  
Author(s):  
Deqiang Chen ◽  
Junhui Luo ◽  
Xianlin Liu ◽  
Decai Mi ◽  
Longwang Xu
Keyword(s):  
Boundary Conditions ◽  
Double Layer ◽  
Soft Soil ◽  
Foundation Engineering ◽  
Soil Consolidation ◽  
Consolidation Theory ◽  
Continuous Drainage ◽  
Consolidation Settlement ◽  
Soil Foundation ◽  
Soft Soil Foundation

Marine soft soil foundation is a double-layer foundation structure with a crust layer and soft substratum. Moreover, it is common that there are various forms of drainage. Accordingly, based on Terzaghi’s consolidation theory and the continuous drainage boundary conditions theory of controllable drainage conditions, an improved double-layer soil consolidation theory considering continuous drainage boundary conditions was proposed. To improve the computational efficiency and accuracy, the Laplace transform and the Stehfest algorithm was used to deduce the numerical solution of the improved double-layer soil consolidation theory considering continuous drainage boundary conditions and to compile a computer program. Subsequently, the theory was validated and analyzed by the degenerated model of the perfectly permeable boundary conditions and the semi-permeable boundary conditions, respectively, which showed that this theory has higher accuracy. Simultaneously, the analysis of double-layer consolidation settlement under continuous drainage boundary conditions for marine soft soil foundation of Guangxi Binhai Highway was carried on. The result showed that the consolidation settlement calculated by the improved double-layer consolidation theory presented is basically consistent with the field measurement results, and that the correlation coefficient between them is higher. Accordingly, the research results can provide useful basic information for marine soft foundation engineering.

Overview of the Development of Consolidation Theory of Unsaturated Soils

2013 ◽  
Vol 734-737 ◽  
pp. 2318-2323
Author(s):  
Chuan Yin Lu ◽  
Sheng Zhu
Keyword(s):  
Unsaturated Soil ◽  
Unsaturated Soils ◽  
Test Results ◽  
Consolidation Theory

The consolidation theory and test results of unsaturated soils were summarized in detail in this article, which include the recent development. And some existent difficulties and problems for consolidation theory of unsaturated soil were also summarized. The consolidation theory of unsaturated soils have well applicable future, but the theory is not mature and need the investigators’ further research.

The collapse behavior of a compacted soil during inundation

1991 ◽  
Vol 28 (4) ◽  
pp. 477-488 ◽  
Author(s):  
Rambabu Tadepalli ◽  
D. G. Fredlund
Keyword(s):  
Experimental Data ◽  
Pore Water ◽  
Unsaturated Soil ◽  
Transient Flow ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Matric Suction ◽  
Coefficient Of Consolidation ◽  
Compacted Soil ◽  
Collapse Behavior

The collapse behavior of a compacted, uncemented soil is studied within a theoretical context consistent with the concepts of unsaturated soil mechanics. Experimental data are presented relating the initial matric suction of a compacted soil to its volume decrease during inundation. The laboratory results indicate a unique relationship between the changes in matric suction (i.e., Δ(ua − uw), where ua is the pore-air pressure and uw is the pore-water pressure) of the compacted soil and the resulting volume reduction during inundation. Changes in the matric suction and total volume with respect to time were modelled using the theory of transient flow through an unsaturated soil. The predicted results show reasonable agreement with the experimental observations. The comparisons between the simulated results and the experimental data indicate that the coefficient of consolidation of the soil varies linearly with matric suction during the inundation process. Key words: unsaturated soil, matric suction, collapsible soils, negative pore-water pressures.

scholarly journals Corrugation of an unpaved road surface under vehicle weight

2020 ◽  
Vol 476 (2241) ◽  
pp. 20200323
Author(s):  
C. Matsuyama ◽  
Y. Tanaka ◽  
M. Sato ◽  
H. Shima
Keyword(s):  
Experimental Data ◽  
Flat Surface ◽  
Heavy Traffic ◽  
Vertical Oscillation ◽  
Soil Consolidation ◽  
Unpaved Road ◽  
Moving Vehicles ◽  
Growth Phenomenon ◽  
Road Surfaces ◽  
Underlying Soil

Road corrugation refers to the formation of periodic, transverse ripples on unpaved road surfaces. It forms spontaneously on an initially flat surface under heavy traffic and can be considered to be a type of unstable growth phenomenon, possibly caused by the local volume contraction of the underlying soil due to a moving vehicle’s weight. In the present work, we demonstrate a possible mechanism for road corrugation using experimental data of soil consolidation and numerical simulations. The results indicate that the vertical oscillation of moving vehicles, which is excited by the initial irregularities of the surface, plays a key role in the development of corrugation.

A simplified procedure to estimate the shear strength envelope of unsaturated soils

2006 ◽  
Vol 43 (10) ◽  
pp. 1088-1095 ◽  
Author(s):  
Orencio Monje Vilar
Keyword(s):  
Experimental Data ◽  
Shear Strength ◽  
Unsaturated Soil ◽  
Unsaturated Soils ◽  
Hyperbolic Function ◽  
Soil Suction ◽  
Suction Control ◽  
Saturated Sample ◽  
Simplified Procedure ◽  
Good Agreement

Procedures that allow the prediction of some properties of unsaturated soils or the minimization of the number of tests needed to measure them are advantageous because the control of suction during testing is a formidable task that is time consuming and involves a great degree of expertise. A simplified procedure is proposed in this paper to estimate the shear strength of an unsaturated soil. The procedure is based on an empirical hyperbolic function that has been successfully used to fit experimental data. The function requires two input values, namely the shear strength of a saturated sample and the shear strength of an air-dried sample tested without the need for suction control. Samples tested under a controlled suction larger than the maximum suction expected in the problem can, alternatively, replace the air-dried samples. Both alternatives were tested against results for various soils reported in the literature. The good agreement between the estimates and the experimental data indicates that the proposed procedure is promising and reliable for estimating preliminary unsaturated shear strength parameters.Key words: unsaturated soil, suction, shear strength, prediction, laboratory tests.

Analysis of Soil Consolidation Characteristics Caused by Pit Dewatering

2012 ◽  
Vol 204-208 ◽  
pp. 33-36 ◽  
Author(s):  
Huai Feng Tong
Keyword(s):  
Pore Water ◽  
Effective Stress ◽  
Pore Volume ◽  
Soil Mechanics ◽  
Compressive Deformation ◽  
Soil Consolidation ◽  
Consolidation Theory ◽  
Soil Volume

Consolidation in soil mechanics is the process that the soil to produce compressive deformation under load, and pore volume is smaller, pore water is squeezed out, the soil volume is gradually reduced and finally become stable. In the pit dewatering Project, due to the pore water is expelled, the soil effective stress increases, the pore volume decreases, and the soil produce compression within the influence of precipitation. In this paper, based on the analysis of classical consolidation theory, the differences of two classical consolidation theory is compared, the consolidation characteristics of soil is obtained in the process of pit dewatering.

Sign in / Sign up

Export Citation Format

Share Document