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Manual Notice: 2018-1

From: Gregg A. Freeby, P.E., Director, Bridge Division

Manual: Geotechnical Manual

Effective Date: March 01, 2018

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Purpose

This manual provides guidance to districts in geotechnical investigation and design for project development.

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Contents

The revisions contained in each chapter of this version are to clarify the policy and high-level procedures published in 2012. Generally, revisions to the manual were to:

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  • update information in Chapter 3 regarding Standard Penetration Testing design methodologies;
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  • make minor editorial changes to Chapter 4;
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  • make editorial changes to the design requirements for various retaining walls in Chapter 6; and
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  • provide clarification on the infinite slope analysis in Chapter 7.

Chapter 5 underwent significant revisions and updates, which include:

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  • adding an upper limit to the skin friction and point bearing graphs for Texas Cone Penetration values harder than 100 blows/12 inches;
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  • updating the maximum allowable service load table for drilled shafts to include larger diameters;
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  • adding new sections on drilled shaft reinforcement, drilled shaft integrity testing, dynamic monitoring, and foundation load testing;
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  • clarifications to the layout notes for drilled shafts;
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  • updating the scour section to include new bridges with known foundations, existing bridges with known foundations, existing bridges with unknown foundations, bridge class culverts, and scour critical bridges; and
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  • adding a new section on stone protection at bridges.
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Supersedes

The revised manual supersedes prior versions of the manual.

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Contact

For more information about any portion of this manual, please contact the TxDOT Bridge Division.

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Archives

Past manual notices are available in a PDF archive.

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