Dear All
I have managed to get into the unfortunate position of trying to correlate N values between SPT's and CPT's in differing size cable percussive BH's (150 and 200 mm). (I must add not from my instructions). All the boreholes (approximately 8 No) have has SPT / CPT carried out at approx 1 m intervals throughout the hole and are not surprisingly giving widely differing uncorrected N values. This has been put down to a series of factors :
a. Differing resistance to the SPT split spoon and CPT cone
b. Effects of different BH diameters (150 & 200 mm)
Literature I have read indicates that correction factors can be applied, but the question is raised whether this is imperial ie assessed from site data, or is their a slightly more scientific way of approaching the subject and that correction should be made due to differing surface areas etc
I know that this subject appear frequently on the list, and I apologise if it is a reoccuring theme. Any advice would be grateful.
Many thanks in advance
Simon
Simon Croxford
Engineering Geologist
IMC Consulting Engineers Ltd
PO Box 18
Mill Lane
Huthwaite
Sutton in Ashfield
Notts NG17 2NS
Tel : 01623 444611
Fax : 01623 440021
E Mail : [log in to unmask]
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