Manual on Subsurface Investigations National Highway Institute Publication No. FHWA NHI Federal Highway Administration Washington, DC
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1 Manual on Subsurface Investigations National Highway Institute Publication No. FHWA NHI Federal Highway Administration Washington, DC Geotechnical Site Characterization July 2001 by Paul W. Mayne, Barry R. Christopher, and Jason DeJong
2 SUBSURFACE INVESTIGATIONS TABLE OF CONTENTS Page Preface... Units Conversions... Table of Contents... LIST OF NOTATIONS... ii ii iii x 1.0 Introduction Scope of this Manual Geotechnical Engineer s Role in Subsurface Exploration Project Initiation Project Type New Construction Rehabilitation Projects Contaminated Sites Existing Data Sources Site Visit/plan-in-hand Communication with Designers/Project Managers Subsurface Exploration Planning Types of Investigation Remote Sensing Geophysical Investigations Disturbed Sampling In-Situ Investigation Undisturbed Sampling Frequency and Depth of Borings Boring Locations and Elevations Equipment Personnel and Personal Behavior Plans and Specifications Standards and Guidelines Drilling and Sampling of Soil and Rock Soil Exploration Soil Drilling Continuous Flight Augers Hollow-Stem Augers Rotary Wash Borings Bucket Auger Borings Area Specific Methods iii
3 Hand Auger Borings Exploration Pit Excavation Logging Procedures Photography Soil Samples Disturbed Samples Undisturbed Samples Soil Samplers Split Barrel Sampler Thin Wall Sampler Piston Sampler Pitcher Tube Sampler Denison Sampler Modified California Sampler Continuous Soil Sampler Other Soil Samplers Bulk Samples Block Samples Sampling Interval and Appropriate Type of Sampler Sample Recovery Sample Identification Relative Strength Tests Care and Preservation of Undisturbed Soil Samples Exploration of Rock Rock Drilling and Sampling Non-Core (Destructive) Drilling Types of Core Drilling Coring Bits Drilling Fluid Observation During Core Drilling Drilling Rate/Time Core Photographs Rock Classification Recovery Rock Quality Designation (RQD) Length Measurements of Core Pieces Assessment of Soundness Drilling Fluid Recovery Core Handling and Labeling Care and Preservation of Rock Samples Geologic Mapping Boring Closure Safety Guidelines for Geotechnical Borings Common Drilling Errors Boring Log Preparation General Project Information Boring Locations and Elevations Stratigraphy Identification iv
4 4.5 Sample Information Soil Description/Soil Classification Consistency and Apparent Density Water Content (Moisture) Color Type of Soil Coarse-Grained Soils (Gravel and Sand) Feel and Smear Test Sedimentation Test Visual Characteristics Fine-Grained Soils Shaking (Dilatancy) Test Dry Strength Test Thread Test Smear Test Highly Organic Soils Minor Soil Type(s) Inclusions Geological Name AASHTO Soil Classification System Logging Procedures for Core Drilling Description of Rock Rock Type Color Grain Size and Shape Stratification/Foliation Mineral Composition Weathering and Alteration Strength Hardness Rock Discontinuity Fracture Description In-Situ Testing Standard Penetration Test (SPT) Cone Penetration Testing (CPT) Piezocone Penetration Testing (CPTu) Baseline Readings Routine CPTu Operations CPT Profiles Vane Shear Test (VST) Undrained Strength and Sensitivity Field Vane Results Vane Correction Factor Flat Plate Dilatometer Testing (DMT) Pressuremeter Testing (PMT) Special Probes and In-Situ Tests Geophysical Methods v
5 5.7.1 Mechanical Waves Seismic Refraction (SR) Crosshole Tests (CHT) Downhole Tests (DHT) Surface Waves (SASW) Electromagnetic Waves Ground Penetrating Radar Electrical Resistivity (ER) Survey Electromagnetic (EM) Techniques Magnetic Surveys Summary on In-Situ and Geophysical Methods Groundwater Investigations General Determination of Groundwater Levels and Pressures Information on Existing Wells Open Borings Observation Wells Water Level Measurements Chalked Tape Tape with a Float Electric Water-Level Indicator Data Loggers Field Measurement of Permeability Seepage Tests Falling Water Level Method Rising Water Level Method Constant Water Level Method Pressure ( Packer ) Test Pumping Tests Slug Tests Piezocone Dissipation Tests Laboratory Testing for Soils General Weight-Volume Concepts Load-Deformation Process in Soils Principle of Effective Stress Overburden Stress Selection and Assignment of Tests Visual Identification of Soils Index Properties Moisture Content Specific Gravity Unit Weight Sieve Analysis Hydrometer Analysis Atterberg Limits Moisture-Density (Compaction) Relationship vi
6 Classification of Soils Corrosivity of Soils Resistivity Organic Content of Soils Strength Tests Total or Effective Stress Analysis Unconfined Compressive Strength of Soils Triaxial Strength (TX) Direct Shear (DS) Direct Simple Shear (DSS) Test Resonant Column Miniature Vane California Bearing Ratio (CBR) R-Value Test Resilient Modulus Permeability Consolidation One-Dimensional Compression (Consolidation) Swell Potential of Clays Collapse Potential of Soils Quality Assurance for Laboratory Testing Storage Sample Handling Specimen Selection Equipment Calibration Pitfalls Laboratory Testing for Rocks Introduction Laboratory Tests Strength Tests Point-Load Strength Test Uniaxial Compression Test Split Tension (Brazilian) Test Direct Shear Strength of Rock Durability Slake Durability Soundness of Riprap Durability Under Freezing and Thawing Strength-Deformation Characteristics Elastic Modulii Ultrasonic Testing Quality Assurance for Laboratory Testing Cautions Interpretation of Soil Properties Introduction vii
7 9.2 Compositional and Classification Soil Classification and Geostratigraphy Soil Classification by Soil Sampling & Drilling Soil Classification by Cone Penetration Testing Soil Classification by Flat Dilatometer Density Unit Weight Relative Density Correlations for Sands Strength and Stress History Drained Friction Angles of Sands Preconsolidation Stress of Clays Undrained Strength of Clays and Silts Lateral Stress State Stiffness and Deformation Parameters Small-Strain Shear Modulus Modulus Reduction Direct and Indirect Assessments of G Flow Properties Monotonic Dissipations Dilatory Dissipations Nontextbook Materials Interpretation of Rock Properties Introduction Intact Rock Properties Specific Gravity Unit Weight Ultrasonic Velocities Compressive Strength Direct and Indirect Tensile Strength Elastic Modulus of Intact Rock Operational Shear Strength Rock Mass Classifications Rock Mass Rating System (RMR) NGI Q-Rating Geological Strength Index (GSI) System Rock Mass Strength Rock Mass Modulus Foundation Resistances Allowable Bearing Stress for Foundations Side Resistances for Drilled Shafts Additional Rock Mass Parameters Geotechnical Reports Types of Reports Geotechnical Investigation Reports Geotechnical Design Reports GeoEnvironmental Reports viii
8 11.2 Data Presentation Borings Logs Test Location Plans Subsurface Profiles Limitations Contracting of Geotechnical Subsurface Exploration Drilling and Testing Specifications References Appendix A Appendix B Safety Guidelines for Drilling into Soil and Rock and Health and Safety Procedures for Entry into Borings... A-1 Websites: Geotechnical Equipment Suppliers and Service Testing Companies... B-1 ix
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