Cone Penetration Testing in Geotechnical Practice
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1 Cone Penetration Testing in Geotechnical Practice Table Of Contents: LIST OF CONTENTS v (4) PREFACE ix (2) ACKNOWLEDGEMENTS xi (1) SYMBOL LIST xii (4) CONVERSION FACTORS xvi (6) GLOSSARY xxii 1. INTRODUCTION 1 (7) 1.1 Purpose and scope 1 (1) 1.2 General description of CPT and CPTU 1 (1) 1.3 Role of CPT in site investigation 2 (2) 1.4 Historical background 4 (4) Mechanical cone penetrometers 4 (2) Electric cone penetrometers 6 (1) The piezocone 7 (1) 2. EQUIPMENT AND PROCEDURES 8 (17) 2.1 Cone penetrometer and piezocone 8 (2) 2.2 Pushing equipment 10 (6) On land 10 (3)
2 2.2.2 Over water 13 (1) Depth of penetration 14 (2) 2.3 Test procedures 16 (4) Pre-drilling, on land testing 16 (1) Verticality 16 (1) Reference measurements 17 (1) Rate of penetration 17 (1) Interval of readings 17 (1) Depth measurements 18 (1) Saturation of piezocones 18 (1) Dissipation test 19 (1) 2.4 Data acquisition 20 (1) 2.5 Calibration of sensors 20 (2) 2.6 Maintenance 22 (1) 2.7 Choice of capacity of load cells 22 (1) 2.8 Precision and accuracy 23 (1) 2.9 Summary of performance checks and 24 (1) maintenance requirements 3. CHECKS, CORRECTIONS AND 25 (14) PRESENTATION OF DATA 3.1 Factors affecting measurements and 25 (9) corrections Pore water pressure effects on q(c) 25 (3) and f(s) Filter location 28 (3) Effect of axial load on pore water 31 (1) pressure readings Temperature effects 31 (1) Inclination 32 (1) Calibration and resolution of errors 32 (1) Effect of wear 33 (1)
3 3.1.8 Correction for CPTU zeroed at the 33 (1) bottom of a borehole 3.2 Presentation of results 34 (4) Measured parameters 34 (2) Derived parameters 36 (2) Additional information 38 (1) 3.3 Checks on data quality 38 (1) 4. STANDARDS AND SPECIFICATIONS 39 (6) 4.1 ISSMFE International Reference Test 39 (1) Procedure for Cone Penetration Test (CPT) 4.2 Swedish Geotechnical Society (SGF): 39 (4) Recommended Standard for Cone Penetration Tests (1993) 4.3 Norwegian Geotechnical Society (NGF): 43 (1) Guidelines for Cone Penetration Tests (1994) 4.4 ASTM: Standard Test Method for 43 (1) Performing Electronic Friction Cone and Piezocone Penetration Testing of Soils (1995) 4.5 Dutch Standard: Determination of the 43 (1) Cone Resistance and Sleeve Friction of Soil. NEN5140 (1996) 4.6 Recommendations 44 (1) 5. INTERPRETATION OF CPT PIEZOCONE DATA 45 (104) 5.1 General factors affecting interpretation 45 (5) Equipment design 46 (1) In situ stresses 46 (1) Compressibility, cementation and 46 (1) particle size Stratigraphy 46 (1)
4 5.1.5 Rate of penetration 47 (1) Pore pressure element location 48 (2) 5.2 Soil stratigraphy 50 (1) 5.3 Soil classification 51 (4) 5.4 Interpretation in fine-grained soils 55 (26) State characteristics 56 (7) Soil unit weight 56 (1) Overconsolidation ratio 56 (5) In situ horizontal stress 61 (2) Strength characteristics 63 (8) Undrained shear strength 63 (5) Sensitivity 68 (1) Effective stress strength 69 (2) parameters Deformation characteristics 71 (3) Constrained modulus 71 (2) Undrained Young's modulus 73 (1) Small strain shear modulus 74 (1) Flow and consolidation 74 (7) characteristics Coefficient of consolidation 75 (5) Coefficient of permeability 80 (1) (hydraulic conductivity) 5.5 Interpretation in coarse-grained soils 81 (13) State characteristics 81 (8) Relative density (density index) 81 (4) State parameter 85 (3) Overconsolidation ratio 88 (1) In situ horizontal stress 88 (1) Strength characteristics 89 (4) Effective stress strength 89 (4)
5 parameters Deformation characteristics 93 (1) Young's modulus 93 (1) Constrained modulus 93 (1) Small strain shear modulus 94 (1) 5.6 Available experience and interpretation 94 (26) in other material Intermediate soils (clayey sands to 95 (3) silts) Penetration behaviour 95 (1) Typical results and classification 95 (1) Undrained shear strength 96 (1) Effective stress strength 96 (1) parameters Constrained modulus 96 (1) Small strain shear modulus 97 (1) Coefficient of consolidation 98 (1) General experience 98 (1) Peat organic silt 98 (2) Underconsolidated clay 100 (1) Chalk 100 (1) Calcareous soils 101 (2) Soil classification 102 (1) Undrained shear strength 102 (1) Relative density 103 (1) Effective stress strength 103 (1) parameters Pile side friction 103 (1) Cemented sands 103 (4) Snow 107 (1) Permafrost and ice 107 (4)
6 Identification of permafrost ice 107 (1) layers Special procedures for penetration 108 (1) tests in frozen soil Determination of creep 108 (3) parameters General comment 111 (1) Gas hydrates 111 (1) Residual soils 111 (1) Mine tailings 112 (2) Sawdust and wood choppings 114 (2) Dutch cheese 116 (1) Slurry walls 116 (1) Volcanic soils 117 (1) Fuel ash 117 (2) Loess soil 119 (1) Lunar soil 120 (1) 5.7 Examples of unusual behaviour 120 (3) Limiting negative pore pressures due 120 (1) to cavitation Negative pore pressure 121 (1) measurement with filter on the cone Effect of the weight of rig on shallow 122 (1) test results 5.8 The use of non-standard equipment or 123 (9) procedures Cone size and scale effects 123 (2) Cone penetrometer geometry 125 (2) Length of the cylindrical portion 125 (1) behind the cone included in q(c) Reduced area behind the cone 125 (1)
7 Non-standard position and area of 126 (1) friction sleeve Cone apex angle 127 (1) Rate of penetration 127 (1) Set-up tests 128 (4) Applying water during penetration 132 (1) Vibratory cone penetrometer 132 (1) 5.9 Statistical treatment of data 132 (13) Definitions 133 (1) Sources of uncertainty and 134 (1) variability of soil properties Statistical treatment 135 (8) Site investigation strategy and 143 (1) Bayesian updating techniques Recommendation 144 (1) 5.10 Software application 145 (4) 6. DIRECT APPLICATION OF CPT CPTU RESULTS 149 (23) 6.1 Correlations with SPT 149 (2) 6.2 Deep foundations 151 (6) Axial capacity 151 (4) Factor of safey 155 (1) Settlement 155 (1) Skirt penetration resistance 156 (1) 6.3 Shallow foundations 157 (2) Bearing capacity 157 (1) Settlement 158 (1) 6.4 Ground improvement - quality control 159 (5) 6.5 Liquefaction 164 (8) Liquefaction definitions 164 (2) Application of CPT for liquefaction 166 (5) assessment
8 Cyclic softening 166 (3) Flow liquefaction 169 (2) Minimum undrained shear 171 (1) strength Recommendations for liquefaction 171 (1) evaluation 7. ADDITIONAL SENSORS THAT CAN BE 172 (20) INCORPORATED 7.1 Lateral stress measurements 172 (3) Equipment 172 (1) Typical results 173 (1) Interpretation 174 (1) 7.2 Cone pressuremeter 175 (4) Equipment 175 (2) Testing procedure 177 (1) Interpretation 178 (1) 7.3 Seismic measurements 179 (3) Equipment and procedures 180 (1) Typical results and interpretation 181 (1) 7.4 Electrical resistivity measurements 182 (4) Principles for measurement 182 (1) Equipment and procedures 183 (1) Typical results and interpretation 184 (2) 7.5 Heat flow measurements 186 (1) 7.6 Radioisotope measurements 186 (4) Equipment, measurement principles 186 (3) and procedures Typical results 189 (1) Discussion on soil density measured 189 (1) by NDT 7.7 Acoustic noise 190 (2)
9 8. GEO-ENVIRONMENTAL APPLICATIONS OF 192 (12) PENETRATION TESTING 8.1 Objectives of a geo-environmental site 192 (1) investigation 8.2 CPT technology for site characterization 193 (1) 8.3 Geo-environmental penetrometer 193 (6) logging devices Temperature 193 (1) Electrical resistivity and conductivity 193 (1) Dielectric measurements 194 (1) ph sensors 195 (1) Redox potential 196 (1) Gamma and neutron sensors 196 (1) Laser induced fluorescence 196 (3) 8.4 Geo-environmental penetrometer 199 (2) sampling devices Liquid samplers 199 (2) Vapour samplers 201 (1) Solid samplers 201 (1) 8.5 Sealing and decontamination 201 (1) procedures 8.6 Future trends 202 (1) 8.7 Summary 203 (1) 9. EXAMPLES 204 (19) 9.1 Example profiles 204 (9) Marine, lightly overconsolidated 204 (1) clay, Onsoy, Norway Organic clay, lightly 205 (2) overconsolidated, Lilla Mellosa, Sweden Overconsolidated Yoldia (Aalborg) 207 (1) clay, Aalborg, Denmark
10 9.1.4 Overconsolidated clay till, Cowden, 208 (1) UK Sand over silty clay, McDonald's 209 (1) Farm, Vancouver, BC Overconsolidated dense sand, 210 (1) Dunkirk, France Normally consolidated very silty 211 (2) clay, Pentre, UK 9.2 Worked examples 213 (10) Loose to medium dense sand, 213 (3) Massey Tunnel site, Canada Very dense overconsolidated sand, 216 (1) Sleipner, North Sea Stiff overconsolidated Gault clay, 217 (1) Madingley, UK Normally consolidated soft alluvial 218 (5) clay, Bothkennar, UK 10. FUTURE TRENDS 223 (2) 10.1 Recent developments 223 (1) 10.2 Future developments 223 (2) REFERENCES 225 (24) APPENDICES 249 (56) APPENDIX A: ISSMFE REFERENCE TEST 249 (12) PROCEDURE APPENDIX B: SWEDISH STANDARD FOR CONE 261 (30) TESTING APPENDIX C: CALIBRATION CHAMBER TESTING 291 (14) OF SANDY SOILS INDEX 305
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