2005_geotechnical investigation planning guidelines

2005_geotechnical investigation planning guidelines -...

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02/14/2005 NDOT Geotechnical Policies and Procedures Manual GEOTECHNICAL POLICIES AND PROCEDURES MANUAL CHAPTER 5 GEOTECHNICAL INVESTIGATION PLANNING GUIDELINES
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GEOTECHNICAL INVESTIGATION PLANNING GUIDELINES 5-i 02/14/2005 NDOT Geotechnical Policies and Procedures Manual TABLE OF CONTENTS 1. PURPOSE . .......................................................................................................... 1 2. INTRODUCTION . ................................................................................................ 1 3. GENERAL GUIDELINES FOR GEOTECHNICAL INVESTIGATIONS . ............... 1 4. ROADWAY ALIGNMENT INVESTIGATIONS. ..................................................... 2 5. ROADWAY CENTERLINE CUT AND EMBANKMENT INVESTIGATIONS. ........ 3 5.1 Embankments Over Soft Ground . ........................................................................ 4 5.2 Bridge Approach Embankments. .......................................................................... 5 5.3 Rock Slopes. ........................................................................................................ 5 6. LANDSLIDE INVESTIGATIONS. ......................................................................... 6 7. BORROW AREA INVESTIGATIONS. .................................................................. 7 8. STRUCTURE INVESTIGATIONS. ....................................................................... 8 8.1 Bridges. ................................................................................................................ 8 8.2 Earth Retaining Walls. .......................................................................................... 9 8.3 Buildings. .............................................................................................................. 9 8.4 Drainage Structures (Culverts). ............................................................................ 9 8.5 Large Load Light and Sign Structures. ............................................................... 10 8.6 Tunnels . ............................................................................................................. 10 8.7 Detention Basins. ............................................................................................... 10 9. FIGURES. .......................................................................................................... 11 5-1: Guidelines for Boring Layout. ...................................................................... 11 5-2: Minimum Requirements for Boring Depth. .................................................. 12 5-3: Guideline Sampling and Testing Criteria. .................................................... 13 10. REFERENCES . ................................................................................................. 14
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GEOTECHNICAL INVESTIGATION PLANNING GUIDELINES 5-1 02/14/2005 NDOT Geotechnical Policies and Procedures Manual 1. PURPOSE A subsurface investigation may need to be performed at the site of all roadway construction projects, including: widening, extension, modification and rehabilitation. This
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