Rock-socketed shafts for highway structure foundations

NCHRP Synthesis 360 – Rock-Socketed Shafts for Highway Structure Foundations......Page 1
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Transportation Research Board 2006 Executive Committee (Membership as of April 2006)......Page 2
Rock-Socketed Shafts for Highway Structure Foundations......Page 3
About the National Academies......Page 5
NCHRP Committee for Project 20-5......Page 6
Preface......Page 7
Contents......Page 8
Summary......Page 10
Scope and Objectives......Page 11
Organization of Synthesis......Page 12
Design Process......Page 13
Site Geology......Page 16
Field Investigations......Page 18
Geologic and Index Properties of Rock......Page 24
Engineering Properties of Rock......Page 28
Intermediate Geomaterials......Page 37
Summary......Page 39
Load Transfer Behavior of Rock Sockets......Page 41
Capacity Under Axial Loading......Page 45
Axial Load-Displacement Behavior......Page 55
Current AASHTO Practice......Page 59
Summary......Page 60
Rock-Socketed Foundations for Lateral Loading......Page 62
Analytical Methods......Page 63
Structural Issues......Page 74
Summary......Page 78
Construction of Rock Sockets......Page 79
Field Load Testing......Page 82
Constructability, Inspection, and Quality Assurance......Page 96
Examples of Difficult Geologic Conditions......Page 101
Summary......Page 103
Site and Geomaterial Characterization......Page 105
Design for Axial Load......Page 106
Constructability and Inspection......Page 107
Research Needed to Advance State of Practice......Page 108
Equation Symbols......Page 110
References......Page 112
Appendix A - Survey Respondents......Page 118
Appendix B - Survey Questionnaire and Responses......Page 119
Abbreviations used without definitions in TRB publications......Page 145