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Title:

LONG-TERM STRENGTH OF COMPACTED HIGH-PI CLAYS

Accession Number:

00972252

Record Type:

Monograph

Availability:

National Technical Information Service

5301 Shawnee Road
Alexandria, VA 22312 USA

Abstract:

Moisture infiltration into earth slopes and structures constructed of high-plasticity clays will lead to a reduction in soil suction and strength that can ultimately result in stability failure. This research presents a rational analysis of this process that: establishes a relationship between soil suction and strength, and provides a framework for predicting the time rate of strength loss due to moisture infiltration into an earth mass. This research utilizes a generalized form of the Mohr-Coulomb failure criterion to characterize the effects of suction on soil strength. A diffusion equation governs changes in soil moisture and suction. This equation is in general non-linear for unsaturated soils; however, this research uses a linearized formulation through appropriate transformation of variables. This research also presents methods for estimating the necessary material parameters needed for input into the moisture diffusion model. The suction-strength relationships and moisture diffusion analyses are applied to back-analyzing a number of shallow slope failures in Texas high-PI (plasticity index) clays. The moisture diffusion analysis is also extended to typical Texas Department of Transportation earth-retaining structures to predict decreases in suction during the life of these structures. Based on these suction predictions, estimates of soil strength within an earth structure as a function of location and time are possible.

Supplemental Notes:

Research Project Title: Long-Term Strength Properties of High-PI Clays Used in Embankment Construction.

Report Numbers:

FHWA/TX-03/2100-1,
Research Report 2100-1,
TTI: 0-2100

Contract Numbers:

Project No. 0-2100

Language:

English

Corporate Authors:

Texas Transportation Institute

Texas A&M University System, 1600 E Lamar Boulevard
Arlington, TX 76011 USA

Texas Department of Transportation

Research and Technology Implementation Office, P.O. Box 5080
Austin, TX 78763-5080 USA

Federal Highway Administration

1200 New Jersey Avenue, SE
Washington, DC 20590 USA

Authors:

Aubeny, C
Lytton, R

Pagination:

100 p.

Publication Date:

2003-2

Period Covered:

0009-0212

Features:

Appendices (1) ; Figures (24) ; References (25) ; Tables (9)

Subject Areas:

Geotechnology; Highways; I42: Soil Mechanics

Files:

TRIS, USDOT, STATEDOT

Created Date:

Apr 30 2004 12:00AM