Geomecanica

EM 1110-2-1902 31 Oct 2003

US Army Corps of Engineers®

ENGINEERING AND DESIGN

Slope Stability

ENGINEER MANUAL

AVAILABILITY
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CECW-EW Manual No. 1110-2-1902

DEPARTMENT OF THE ARMY U.S. Army Corps of Engineers Washington, DC 20314-1000

EM 1110-2-1902

31 October 2003

Engineering and Design SLOPE STABILITY
1. Purpose. This engineer manual (EM) provides guidance for analyzing thestatic stability of slopes of earth and rock-fill dams, slopes of other types of embankments, excavated slopes, and natural slopes in soil and soft rock. Methods for analysis of slope stability are described and are illustrated by examples in the appendixes. Criteria are presented for strength tests, analysis conditions, and factors of safety. The criteria in this EM are to be used withmethods of stability analysis that satisfy all conditions of equilibrium. Methods that do not satisfy all conditions of equilibrium may involve significant inaccuracies and should be used only under the restricted conditions described herein. 2. Applicability. This EM is applicable to all USACE elements and field operating activities having responsibility for analyzing stability ofslopes. 3. Distribution Statement. This publication is approved for public release; distribution is unlimited. 4. Scope of the Manual. This manual is intended to guide design and construction engineer, rather than to specify rigid procedures to be followed in connection with a particular project. FOR THE COMMANDER:

7 Appendixes (See Table of Contents)

MICHAEL J. WALSH Colonel, Corps ofEngineers Chief of Staff

This manual supersedes EM 1110-2-1902, 1 April 1970.

CECW-EW Manual No. 1110-2-1902

DEPARTMENT OF THE ARMY U.S. Army Corps of Engineers Washington, DC 20314-1000

EM 1110-2-1902

31 October 2003

Engineering and Design SLOPE STABILITY
Subject Paragraph Page

Chapter 1 Introduction Purpose and Scope..........................................................................................................1-1 Applicability ...................................................................................................................1-2 References.......................................................................................................................1-3 Notation andGlossary.....................................................................................................1-4 Basic Design Considerations ..........................................................................................1-5 Stability Analysis and Design Procedure........................................................................1-6 Unsatisfactory SlopePerformance..................................................................................1-7 Chapter 2 Design Considerations Introduction.....................................................................................................................2-1 Aspects Applicable to all Load Conditions.....................................................................2-2 Analyses of Stability during Construction and at the End of Construction....................2-3 Analyses of Steady-State Seepage Conditions................................................................2-4 Analyses of Sudden Drawdown Stability .......................................................................2-5 Analyses of Stability during Earthquakes .......................................................................2-6 Chapter 3 Design Criteria...