Department of Civil and Environmental Engineering

**ENCE 640
ADVANCED SOIL MECHANICS**

Fall 2004

M

*Instructor:*

*Office:*

** Telephone:** 301.405.1962
(w/ voice mail)

** Email:** schwartz@eng.umd.edu

** Hours:** M 3-5; Tu 2-5; WF 12-2 (appointments advised—see notes below)

** Course Overview:** This course focuses on the theoretical and
quasi-theoretical approaches for solving problems in the broad soil mechanics
subject areas of stress analysis and consolidation theory. The philosophical
view, however, is that the underlying soil mechanics theories are relatively
straightforward (once understood) and that the real difficulty in geotechnical
engineering is the application of these theories to real-world problems that
are characterized by incomplete, poorly specified, and/or unreliable
information regarding the site characteristics, geometrics, loading, and soil
properties/behavior. Consequently, the course emphasizes issues such as:
problem idealization and identification of key variables (i.e., those having
the most influence on the outcome); methods for estimating needed but unknown
problem data (e.g., soil properties); important sources of error in soil
mechanics analyses; sensitivity of solutions to changes in the problem data;
quick “back of the envelope” scoping calculations (e.g., for preliminary
analysis and/or for checking results); and cost considerations. Discussion of
these topics will inevitably lead to valuable digressions and discussions away
from the nominal topic of the lecture.

** Prerequisites:** This course is intended for graduate students in
civil engineering (others by permission of the instructor). Some basic
familiarity with computer usage is required (e.g., spreadsheets, simple
programming and/or Mathcad, etc.).

*Textbook and **Readings**:*

*Required*: Das, B.M.
(1997) *Advanced Soil Mechanics (2 ^{nd}
Edition)*, Taylor and Francis,

*Suggested*: Coduto, D.P.
(1999) *Geotechnical Engineering:
Principles and Practices*,

Prentice Hall,

good undergraduate soil mechanics textbook.)

Fredlund, D.G., and Rahardjo, H.
(1993) *Soil Mechanics for Unsaturated
Soils*,

Lambe, T.W., and Whitman, R.V. (1969) *Soil Mechanics*, Wiley,

NY.

Additional readings from the literature and other handouts will also be distributed throughout the course.

*Course Content:*

STRESS ANALYSIS

· In situ vs. induced stresses

· Elasticity solutions

· Other constitutive models

· Soil-structure interaction analysis

·
Advanced stress analysis techniques—finite
element methods

POREWATER PRESSURES (SATURATED SOILS)

· Static vs. transient pore pressures

· Review of Effective Stress Principle

· Pore pressure parameters for saturated undrained loading

CONSOLIDATION THEORY

· Classical one-dimensional consolidation theory

· Analytical solutions

· Numerical solutions (finite difference solutions)

· Material properties and testing

· Extensions to basic theory:

- Time-dependent loading

- Nonhomogeneous (e.g., layered) deposits

- Large strains

- Submergence effect

· Accelerated consolidation

·
Multi-dimensional consolidation

SOIL SETTLEMENT

· Immediate settlement

- Elasticity theory

- Empirical correlations

- Strain influence method

· Primary consolidation settlement

- Ultimate settlement equation

- Material properties for primary consolidation settlement analysis

- Methods for reducing primary consolidation settlements

- Sources of error in consolidation analysis

· Secondary consolidation

·
Preloading

PARTIALLY SATURATED SOILS

· Phase properties and relations

· Stress state variables

· Soil suction relationships

· Pore pressure parameters