Principles of Foundation Engineering Eighth Edition by Braja M. Das.
PART 1 Geotechnical Properties and Exploration of Soil
2 Geotechnical Properties of Soil
3 Natural Soil Deposits and Subsoil Exploration
PART 2 Foundation Analysis
4 Shallow Foundations: Ultimate Bearing Capacity
5 Ultimate Bearing Capacity of Shallow Foundations:
6 Vertical Stress Increase in Soil
7 Settlement of Shallow Foundations
8 Mat Foundations
9 Pile Foundations
10 Drilled-Shaft Foundations
11 Foundations on Difficult Soils
PART 3 Lateral Earth Pressure and Earth-Retaining
12 Lateral Earth Pressure
13 Retaining Walls
14 Sheet-Pile Walls
15 Braced Cuts
PART 4 Soil Improvement
16 Soil Improvement and Ground Modification
preface: Soil mechanics and foundation engineering have developed rapidly during the last fifty plus years. Intensive research and observation in both the field and the laboratory have refined and improved the science of foundation design. Originally published in the fall of 1983 with a 1984 copyright, this text on the principles of foundation engineering is now in the eighth edition. It is intended primarily for use by undergraduate civil engineering students. The use of this text throughout the world has increased greatly over the years. It has also been translated into several languages. New and improved materials that have been published in various geotechnical engineering journals and conference proceedings that are consistent with the level of understanding of the intended users have been incorporated into each edition of the text.
Based on the useful comments received from the reviewers for preparation of this edition, changes have been made from the seventh edition. The text now has sixteen chapters compared to fourteen in the seventh edition. There is a small introductory chapter (Chapter 1) at the beginning. The chapter on allowable bearing capacity of shallow foundations has been divided into two chapters—one on estimation of vertical stress due to superimposed loading and the other on elastic and consolidation settlement of shallow foundations. The text has been divided into four major parts for consistency and continuity, and the chapters have been reorganized.
Part I—Geotechnical Properties and Exploration of Soil (Chapters 2 and 3)
Part II—Foundation Analysis (Chapters 4 through 11)
Part III—Lateral Earth Pressure and Earth-Retaining Structures (Chapters 12 through 15)
Part IV—Soil Improvement (Chapter 16)
A number of new/modified example problems have been added for clarity and better understanding of the material by the readers, as recommended by the reviewers. Listed here are some of the signification additions/modifications to each chapter.
● In Chapter 2 on Geotechnical Properties of Soil, empirical relationships between maximum (emax) and minimum (emin) void ratios for sandy and silty soils have been
added. Also included are empirical correlations between emax and emin with the median grain size of soil. The variations of the residual friction angle of some clayey soils along with their clay-size fractions are also included.
● In Chapter 3 on Natural Soil Deposits and Subsoil Exploration, additional approximate correlations between standard penetration resistance and overconsolidation ratio and preconsolidation pressure of the cohesive soil deposits have been introduced. Calculation of the undrained shear strength from the vane shear test results for rectangular and tapered vanes have been updated based on recent ASTM test designations. Iowa borehole shear tests and Ko stepped-blade test procedures have been added.
● In Chapter 4 on Shallow Foundations: Ultimate Bearing Capacity, the laboratory test results of DeBeer (1967) have been incorporated in a nondimensional form in order to provide a general idea of the magnitude of settlement at ultimate load in granular soils for foundations. The general concepts of the development of Terzaghi’s bearing capacity equation have been further expanded. A brief review of the bearing capacity factor Ng obtained by various researchers over the years has been presented and compared. Results from the most recent publications relating to “reduction factors” for estimating the ultimate bearing capacity of continuous shallow foundations supported by granular soil subjected to eccentric and eccentrically inclined load are discussed.
● Chapter 5 on Ultimate Bearing Capacity of Shallow Foundations: Special Cases has an extended discussion on foundations on layered clay by incorporation of the works of Reddy and Srinivasan (1967) and Vesic (1975). The topic of evaluating the ultimate bearing capacity of continuous foundation on weak clay with a granular trench has been added. Also added to this chapter are the estimation of seismic bearing capacity and settlement of shallow foundation in granular soil.
● The procedure to estimate the stress increase in a soil mass both due to a line load and a strip load using Boussinesq’s solution has been added to Chapter 6 on Vertical Stress Increase in Soil. A solution for estimation of average stress increase below the center of a flexible circularly loaded area is now provided in this chapter.
● Chapter 7 on Settlement of Shallow Foundations has solutions for the elastic settlement calculation of foundations on granular soil using the strain influence factor, as proposed by Terzaghi, Peck, and Mesri (1996) in addition to that given by Schmertmann et al. (1978). The effect of the rise of a water table on the elastic settlement of shallow foundations on granular soil is discussed.
● The example for structural design of mat foundation in Chapter 8 is now consistent with the most recent ACI code (ACI 318-11).
● Discussions have been added on continuous flight auger piles and wave equations analysis in Chapter 9 on Pile Foundations.
● The procedure for estimating the ultimate bearing capacity of drilled shafts extending into hard rock as proposed by Reese and O’Neill (1988, 1989) has been added to Chapter 10 on Drilled-Shaft Foundations.
● In Chapter 12 on Lateral Earth Pressure, results of recent studies related to the determination of active earth pressure for earthquake conditions for a vertical back face of wall with c92f9 backfill has been added. Also included is the Caquot and Kerisel solution using the passive earth-pressure coefficient for retaining walls with granular backfill.
● In Chapter 15 on Braced Cuts, principles of general wedge theory have been added to explain the estimation of active thrust on braced cuts before the introduction of pressure envelopes in various types of soils.
● Chapter 16 on Ground Improvement and Modification now includes some recently developed empirical relationships for the compaction of granular and cohesive soils in the laboratory. New publications (2013) related to the load-bearing capacity of foundations in stone columns have been referred to. A brief introduction on deep mixing has also been added.
● A new Appendix A has been added to illustrate reinforced concrete design principles for shallow foundations using ACI-318-11 code (ultimate strength design method). Natural soil deposits, in many cases, are nonhomogeneous. Their behavior as related to foundation engineering deviates somewhat from those obtained from the idealized theoretical studies. In order to illustrate this, several field case studies have been included in this edition similar to the past editions of the text.
● Foundation failure of a concrete silo and a load test on small foundations in soft Bangkok clay (Chapter 4)
● Settlement observation for mat foundations (Chapter 8)
● Performance of a cantilever retaining wall (Chapter 13)
● Field observations for anchored sheet-pile walls at Long Beach Harbor and Toledo, Ohio (Chapter 14)
● Subway extension of the Massachusetts Bay Transportation Authority (MBTA), construction of National Plaza (south half) in Chicago, and the bottom heave of braced cuts in clay (selected cases from Bjerrum and Eide, 1963) (Chapter 15)
● Installation of PVDs combined with preloading to improve strength of soft soil at Nong Ngu Hao, Thailand (Chapter 16)
Instructor Resource Materials
A detailed Instructor’s Solutions Manual and PowerPoint slides of both figures and examples from the book are available for instructors through a password-protected Web site at www.cengagebrain.com.
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“Braja M. Das”.
⏩Edition: 8th edition
⏩Author: Braja M. Das
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