Design and Performance of Embankments on Very Soft Soils
Purchasing Options
Features
- Unique, practically-oriented reference volume on soft soil engineering
- Contains valuable empirical data on soft soil properties and practice for various geographical areas around the world
- Particularly important volume for engineers working with clayey, soft and tropical soils
Summary
Embankment construction projects on very soft soil often give rise to serious problems. This volume on geotechnics and soft soil engineering therefore treats all phases of the design and construction process exhaustively, from the first investigation step to the monitoring of constructed work. The book presents the development concepts necessary for the project stages and discusses in great detail construction methods, displacement estimations, stability analyses, monitoring, and various other aspects involved. Extensive attention is furthermore paid to the application of geosynthetics as a tool to improve the stability of soft soils and embankments. Including various tables and practical data for many geographical areas in the world, this reference volume is essential reading for engineers and researchers in geotechnical engineering, construction, and related disciplines.
Table of Contents
1. Construction Methods
1.1. Soil substitution
1.2. Conventional embankments with temporary surcharge
1.3. Staged-constructed embankments, embankments with lateral berms and reinforced embankments
1.4. Embankments on vertical drains
1.5. Light weight embankments
1.6. Embankments on piles and columns
1.7. Construction methodologies for harbours
1.8. Final comments
2. Geotechnical Site Investigation
2.1. Preliminary investigation
2.2. Complementary investigation
2.3. Vane tests
2.4. Piezocone tests
2.5. T-bar penetration tests
2.6. Soil sampling for laboratory tests
2.7. Oedometric consolidation tests
2.8. Triaxial tests
2.9. Final comments
3. Geotechnical properties of very soft soils
3.1. Index properties
3.2. Stress history
3.3. Compression and consolidation properties
3.4. Strength properties
3.5. Viscous behaviour
3.6. In situ properties
4. Settlement prediction and horizontal displacement
4.1. Types of settlements: immediate, primary compression, secondary compression
4.2. Settlements of staged-constructed embankments
4.3. Estimative of horizontal displacements
4.4. Final comments
5. Settlement acceleration: Use of vertical drains and surcharge load
5.1. Embankments on vertical drains
5.2. Dimensioning of vertical drains: smear, well resistance, combined horizontal and vertical drainages
5.3. Dimensioning of horizontal drainage blankets
5.4. Use of temporary surcharge loads: vacuum surcharge
5.5. Final comments
6. Stability of unreinforced and reinforced embankments
6.1. Design parameters
6.2. Failure modes of embankments constructed on soft soils
6.3. Failure of foundation: critical height of embankment
6.4. Global stability analysis of unreinforced embankments
6.5. Reinforced embankments
6.6. Stability analysis of staged-constructed embankments
6.7. Sequence of stability analysis for embankments on soft soils
6.8. Final comments
7. Embankments on piles and columns
7.1. Piled embankments with geosynthetic platform: soil arching; vertical stresses acting on the geosynthetic; tension forces acting on the reinforcement; case histories;
7.2. Embankments on traditional granular columns: settlement reduction factors; settlement analyses; case histories
7.3. Embankments on encased granular columns: calculation methods; applications
7.4. Final comments
8. Influence of embankments on soft soils in foundations
8.1. Settlement of direct footings
8.2. Pile bearing capacity: Negative friction
8.2.1. Introduction
8.2.2. Conventional method
8.2.3. De Beer & Wallays method
8.2.4. Endo, Minou, Kawasaki & Shibata Method
8.3. Induced loading with depth
8.3.1. Introduction
8.3.2. Rigid pile with embedment within soil block and free rotational movement at interface of soil layers
8.3.3. Rigid pile with bi-rotational movement within soil block and interface of soil layers
8.3.4. Flexible piles
8.4. Construction aspects
8.5. Final comments
9. Monitoring of embankments on soft soils
9.1. Monitoring of vertical displacement
9.2. Measurements of horizontal displacements
9.3. Measurements of pore pressure
9.4. Measurements of the gain in undrained strength of clay
9.5. Monitoring of stresses in geosynthetic reinforcement
9.6. Interpretation of monitoring results
9.7. New trends in instrumentations
9.8. Final comments
Conclusions
Appendices
References
