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E-raamat: Underwater Embankments on Soft Soil: A Case History [Taylor & Francis e-raamat]

(Ghent University, Belgium), (Laboratory of Geotechnics, Ghent University, Belgium)
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Ground improvement is an established technique in foundation engineering. In recent decades, modern methods of ground improvement have utilised explosives, impact energy, thermal treatment of the soil, vacuum consolidation, vibratory compaction technologies, stabilization and solidification of soft soils, as well as combined systems of ingenious grouting systems and deep mixing technique. Internationally, deep mixing techniques are often the chosen method for dealing with increasingly-demanding foundation problems. Initial experiences, using inventive new developments of soft soil deep mixing technologies and various advanced high pressure mixing methods, have proved successful both onshore and offshore. This publication illustrates a challenging example, sited in the Port of Antwerp, Belgium, of the design and construction of a large underwater embankment on very soft soil. This text will be a valuable reference case history for the geotechnical engineer, both from the academic's as well as from the practitioner’s point of view.

About the Authors ix
Preface xi
List of symbols
1(1)
Introduction
1(2)
Construction on soft soil
3(8)
Clay foundation behavior
3(2)
Staged construction
5(6)
Methodology for analysis
7(1)
Consolidation analysis
7(4)
Discussion on undrained shear strength of soft soils
11(14)
Preamble
11(1)
Shear behavior of normally consolidated clay
11(2)
Normalized behavior
13(1)
Shear behavior of overconsolidated clay
14(2)
Laboratory testing techniques
16(4)
Overview
16(2)
SHANSEP
18(1)
Discussion
19(1)
Undrained strength anisotropy
20(3)
Final recommendations
23(2)
Discussion on slope stability evaluation
25(32)
Preamble
25(1)
Causes of slope instability
26(2)
Stability conditions for analysis
28(2)
Stability analysis procedures
30(5)
Limit equilibrium methods
30(1)
Strength reduction methods
31(2)
Limit equilibrium versus strength reduction methods
33(2)
Failure mechanisms for highly sensitive clays
35(14)
Flake type sliding of quick clay
37(3)
Analysis taking pore water pressures into account
40(4)
Mechanism of sliding in quick clay masses
44(5)
Conclusions
49(1)
Risk of liquefaction
49(2)
Slope stability analysis of the Doeldok embankment
51(6)
Evaluation of consolidation
57(14)
One-dimensional consolidation theory
57(1)
Infinitesimal strain theory
58(6)
Numerical solution
60(2)
Applications of SSCON-FD
62(2)
Finite strain theory
64(2)
Infinitesimal strain versus finite strain theory
66(1)
Consolidation at the Doeldok site
66(4)
Conclusions
70(1)
Geotechnical characterization of the site
71(10)
Overview
71(1)
Soil profile and characterization
71(1)
Selection of parameters for design
72(9)
Dredged material
73(5)
Boom clay
78(1)
Sand
79(1)
Summary of soil properties
80(1)
Design of underwater embankment of soft soil
81(10)
Overview
81(1)
Geometry of the embankment
82(1)
Stability analysis
83(4)
Undrained analysis
83(3)
Drained stability analysis
86(1)
Settlements
87(1)
From Constitutive relationships
87(1)
From finite element program
88(1)
Conclusions
88(3)
Ground improvement by deep mixing
91(32)
Introduction
91(1)
Deep mixing applications
92(1)
Mechanism of stabilization
93(3)
Stabilization with lime
94(1)
Stabilization with cement-like binders
94(2)
Methods of installation
96(1)
Belgian experience on on-land deep mixing
97(12)
Properties of untreated soils on land
98(2)
Binders employed on land
100(1)
Lime-cement stabilization in the laboratory
100(2)
Lime-cement stabilization in-situ
102(5)
Remarks on the experience of dry deep mixing on land
107(2)
Deep mixing assessment on the underwater site
109(14)
Properties of the artificially cemented soil in the laboratory
110(6)
Properties of the cemented soil in the field
116(3)
Laboratory versus in-situ behavior
119(4)
Construction and monitoring of embankment
123(12)
Introduction
123(1)
Construction
123(1)
Quality control of the embankment sand
124(4)
Instrumentation and monitoring
128(6)
Excess pore water pressure
129(4)
Settlements
133(1)
Conclusions
134(1)
References 135(4)
Subject Index 139


William F. Van Impe, R. Daniel Verastegui Flores