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Published By Lankelma

Lankelma is the foremost contractor for onshore in-situ soil testing in the UK. An acknowledged specialist in CPT, Lankelma also offers a worldwide consultancy and training service.

Sponsored by A.P. van den Berg

A.P. van den Berg develops, designs and manufactures geotechnical and environmental soil investigation equipment for onshore and offshore applications. Specialists in CPT systems and equipment.

Gardline

Gardline Geosciences offers worldwide marine geotechnics, in-house consutancy and services with marine investigations ranging from nearshore to full ocean depth (down to 3000m).

About the Author

Hans Brouwer studied civil engineering at Delft University in The Netherlands. He has worked as a part-time lecturer at Amsterdam Polytechnic and was senior partner in a structural engineering consultancy. He has written a standard textbook in Dutch about the design of building foundations. He now lives in England where he writes technical textbooks in English, hopefully to reach a bigger readership.

Chapter 7

Onshore testing

Reporting of test results

  
REPORTING OF TEST RESULTS   7.3
 
 Type Time needed to produce                      
 Day report Same day 
 Factual report Next day 
 Report with normalised values    2 days 
 Interpretative report Depends upon specific requirements
 
 
 Day report
The following information is normally reported:
 1 Project number 
 2 Address of site 
 3 Test location reference number 
 4
   		Date of test
   
 5 Type of thrust machine used and pushing capacity 
 6 
  		Use of soil anchors (number and type) if applicable
   
 7 Depth of pre-drilling 
 8 Depth to the groundwater table (if recorded) 
 9 
    		Depth at start of penetration
   
 10 Cones used 
 11 Saturation fluid used in pore pressure system (if piezocone) 
 12
   		Area ratio of the cone (if piezocone)
   
 13  Co-ordinates of the site if available 
 14 Co-ordinates of the test locations if available 
 15  Level of ground at each test at ordinance datum 
 16
     		Zero readings of cone resistance, sleeve friction and pore water
pressure before the test and zero drift (in engineering units) 
  
Factual report
The following information is normally reported:
 1 Project number 
 2 Address of site 
 3 Test location reference number 
 4 Date of test 
 5 Type of thrust machine used and pushing capacity 
 6 Use of soil anchors (number and type) if applicable 
 7 Depth of pre-drilling 
 8 Depth to the ground water table (if recorded) 
 9
   		Depth of start of penetration
   
 10 Cones used 
 11Saturation fluid used in pore pressure system (if piezocone) 
 12 
  		Area of ratio of the cone (if piezocone) 
 
 13 Co-ordinates of the site if available 
 14 Co-ordinates of the test locations if available 
 15 
  		Level of ground at each test at ordinance datum
   
 16 Cone resistance, sleeve friction and friction ratio 
 17 Porewater pressure if applicable 
 18
  		Zero readings before and after the test
   
 19    Description of the stratum in depth 
 
 
 Report with normalised values
Further processing of the measured data can be carried out based on
the following simple relationships:
 
 ♦ Excess porewater pressureΔu = u2 - u0 
 ♦ Net cone resistanceqn = qt - σvo 
 ♦ Friction ratio Rf = (fs / qt) x 100% 
 ♦ Pore pressure ratioBq =  Δu / qn
 ♦ Normalised excess pore
  pressure 		U = (ut - uo) / (ui - uo) where ut is the
pore pressure at time t in a
dissipation test and ui is the pore
pressure at the start of the
dissipation test 
 


Interpretative report

  • Soil parameters
     
  • Design of shallow foundations
     
  • Pile design
     
  • Design of sheet piles
     
  • Settlement parameters
     
  • Contamination
     
       
  
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