Foreword
This publication was prepared by the Committee on Earthquakes of the United States Society on Dams (USSD) to provide a guide for the inspection of dams following an earthquake. Inspection immediately following an earthquake is most crucial to decisions regarding continued operation of the structure. Follow up inspections provide more detailed information on structure performance for the design of any needed repairs and provide insight to structural performance under seismic loading. Inspection requirements for a dam can be made more meaningful by tailoring them to a specific dam using these guidelines.
Additionally, it is hoped that application of these guidelines and publication of inspection findings will provide dam designers with a wealth of information on dam performance during earthquakes. Dam designers have analytical techniques and materials testing procedures which are used to estimate the behavior of materials and the response of dams subject to seismic loadings. On the basis of these estimates, dams are designed and constructed. Verification of the adequacy of design analyses and construction methods, and the establishment of a high level of confidence in these methods, within both the profession and the general public, is necessary. Such verification will be greatly enhanced through complete and meaningful reporting on the behavior of dams and appurtenant structures during earthquakes.
Originally published in 1983, these guidelines have been revised to incorporate knowledge gained in the interim and to recommend the use of modern inspection and reporting equipment. The guidelines were revised by a subcommittee of the USSD Committee on Earthquakes, comprising Richard W. Kramer, Donald H. Babbitt, Joseph J. Ehasz and Thomas M. Leps, with the assistance of other committee members.
USSD Committee on Earthquakes
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Joseph L. Ehasz, Chairman
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Gilles Bureau, Vice Chairman
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| Donald H. Babbitt | Carlos A. Lazarte |
| John A. Barneich | Thomas M. Leps |
| Moshen Beikae | C. Eric Lindvall |
| Yuosof Ghanaat | Faiz I. Makdisi |
| Robert L. Hall | Enrique E. Matheu |
| George F. Horowitz | Francis G. McLean |
| Mary Ellen Hynes | Warren J. Paul |
| Richard W. Kramer | |
Table of Contents
1. INTRODUCTION
2. INSPECTION IMMEDIATE
2.1 Introduction
2.2 Guideline A
2.3 Guideline B
3. INITIAL ENGINEERING FOLLOW UP INSPECTION
3.1 Introduction
3.2 Possible Modes and Causes of Dam Failures
3.2.1 Foundation Deficiencies
3.2.2 Spillway and Outlet Works
3.2.3 Seepage
3.2.4 Defective or Inferior Materials
3.2.5 Concrete Dam Overstressing
3.2.6 Reservoir Margin Defects
3.3 Post Earthquake Inspection of Project Features
3.3.1 Embankment Dams
3.3.2 Concrete and Masonry Dams
3.3.3 Abutments and Foundation
3.3.4 Reservoir
3.3.5 Landslides
3.3.6 Appurtenant Structures
4. REFERENCES
APPENDIX A - MODIFIED MERCALLI INTENSITY SCALE
APPENDIX B - INSPECTION CHECKLISTS
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