Soil bearing capacity from Cone Penetration Test and SPT
Soil bearing capacity from Cone Penetration Test and SPT
(OP)
Dear All,
I have an existing soil report where I'd like to determine the soil bearing capacity of a soil. In the existing report there is Cone Penetration Test and standart Penetration Test result performed at the different location of site. Based on that there is detailed soil stratum (silty sand, sand, clay) average Qc , equivalent SPT blows, m value, Su undrained shear value, Phi (internal friction angle) drained, Dr (relative density) printed for CPT. SPT results are simply plotted on borehole log which shows avg blows as per depth.
Normally if I have simply SPT in hands I'd go simply with Terzaghi & Peck (1967) or Meyerhof(1956 and 1974) formulation to determine the soil bearing capacity.
For CPT results case I plan to use (Caquot equation), (Koppejan equation) or (DeBeer equation) for determining soil bearing capacity.
Can you shed some lights whether my reasoning for getting the soil bearing capacity is correct or not ?
I have an existing soil report where I'd like to determine the soil bearing capacity of a soil. In the existing report there is Cone Penetration Test and standart Penetration Test result performed at the different location of site. Based on that there is detailed soil stratum (silty sand, sand, clay) average Qc , equivalent SPT blows, m value, Su undrained shear value, Phi (internal friction angle) drained, Dr (relative density) printed for CPT. SPT results are simply plotted on borehole log which shows avg blows as per depth.
Normally if I have simply SPT in hands I'd go simply with Terzaghi & Peck (1967) or Meyerhof(1956 and 1974) formulation to determine the soil bearing capacity.
For CPT results case I plan to use (Caquot equation), (Koppejan equation) or (DeBeer equation) for determining soil bearing capacity.
Can you shed some lights whether my reasoning for getting the soil bearing capacity is correct or not ?






RE: Soil bearing capacity from Cone Penetration Test and SPT
RE: Soil bearing capacity from Cone Penetration Test and SPT
Please feel comfortable at answering my question, it won't be a cook-book that I'll built Taipei on three easy step, I already get in touch with a geotechnical engineer and yes generally I don't do soil mechanics or dynamics for living. I simply use those parameters provided by the geotechnical engineering for structural design.
But since soil mechanics is a part of Civil Enginnering and once we calculated all those settlement, soil bearing, lateral stability etc.. in college its a kinda ugly for me not to know basic steps.
RE: Soil bearing capacity from Cone Penetration Test and SPT
RE: Soil bearing capacity from Cone Penetration Test and SPT
Most geotechnical engineers will give the safe bearing pressures in their report. Now that you have LRFD coming into being, it will become a bit more confusing I am sure as the safe bearing capacity will be required and then, as explained above, a safe bearing pressure based on serviceability requirements will need to be provided. All to make structural engineers happy (my personal view as I believe much more in the traditional methods for geotechnical engineering).