Point Load Testing
Point Load Testing
(OP)
Is there a non-graphical method (Brock and Franklin) method of converting Is to Is50? (e.g. formulae)
Reading from the correction graphs is a little clumsy and can give errors.
Thanx in advance for your help.
Reading from the correction graphs is a little clumsy and can give errors.
Thanx in advance for your help.





RE: Point Load Testing
RE: Point Load Testing
Is(50) = F x Is
where F = (De/50)** 0.45 (** means to the power of 0.45)
De is the "equivalent core diameter"
De**2 = D**2 for diametrical test,
De**2 = 4A/phi for axial. block and lump tests
(A = WD= minimum cross sectional area of a plane through platen contact point)
Reference :
1.ISRM - "Suggested method for determining Point Load Strength"
2. N. Brook , "The equivalent core diameter method of size and shape correction in Point Load testing", Intl Journal of Rock Mech., Mineral Sci. and Geomechanics vol 22 no. 2 pp 61-70, 1985
Regards