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Excavation Shoring Design Guide – Digital Version


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Excavation Shoring Design Guide

ISBN: 978-0-9998913-2-2
Page Count: 183
Publisher: NCSEA
Table of Contents

Reviewing a pertinent worked example bolsters any designer’s confidence. The more detailed the worked example is, the better. This design guide is comprised solely of such detailed worked examples.

Excavation support mechanics are adequately described in widely available manuals. Article 68 of Terzaghi’s Theoretical Soil Mechanics describes the standard of practice from 1943 when excavation shoring was still called “timbering.” Agencies with an interest in safe and stable excavation support have been issuing design manuals ever since, updating them every decade or so to include new construction techniques and support changing procurement practices. The most widely used publications include:

  • The Federal Highway Administration’s Geotechnical Engineering Circulars No. 2, No. 4, and No. 7;
  • Section 4 of AASHTO’s Guide Design Specifications for Bridge Temporary Works;
  • The Caltrans Trenching and Shoring Manual, which is useful even if your project is not located in California; and
  • The US Army Corps of Engineers manual, Design of Sheet Pile Walls.
These references cover broad topics, including site characterization and earth pressure diagrams, soil/grout bond strengths, and deflection curves. They focus on sizing the shoring system’s principal members, but this NCSEA Excavation Shoring Design Guide extends farther by providing the real construction details that are necessary to round out complete designs. Using these examples as templates will reduce review comments and requests for information (RFIs).
This is a practitioner’s manual. Design guides like this, filled with best practices, disseminate specialized knowledge in accordance with NCSEA’s mission: in partnership with its Member Organizations, supporting practicing structural engineers to be highly qualified professionals and successful leaders.

About the Author:

Bryan G. Cortnik, P.E., S.E., is a Principal with American Subsurface Engineering, Inc., based in San Francisco, California.
Mr. Cortnik specializes in the design of deep excavation shoring, building underpinning, building shoring specialty foundation systems, and slope stabilization repair projects. He has demonstrated broad experience covering a wide range of geotechnical and foundation engineering and extensive knowledge in the design of wood, steel, and concrete structures. Mr. Cortnik has over 24 years of soil-structure engineering experience in Los Angeles, San Francisco Bay
Area, and Seattle, Washington. Mr. Cortnik has also been active in various technical committees within the Structural Engineers Association of Northern California (SEAONC), where he has previously served as Chair of the Seismology Committee. He is also on technical committees within Deep Foundations Institute (DFI). Mr. Cortnik has a Bachelor of Science in Civil Engineering from California State University, Chico, and a Master of Science in Structural Engineering from California State University, San Jose, and Stanford University.
Mr. Cortnik would also like to thank Doug Hohbach for inspiring and supporting him to publish this design guide.
This publication was edited by the NCSEA Publication Committee.