Dynamic Penetrometer (DPH) conversion
Dynamic Penetrometer (DPH) conversion
(OP)
We have performed some work out of country where conventional SPT was not employed. Rather, dynamic penetrometer soundings were performed. Specifically, the method employed is referred to as "DPH". Could someone provide me with information that will convert the DPH data to standard blow counts?





RE: Dynamic Penetrometer (DPH) conversion
RE: Dynamic Penetrometer (DPH) conversion
weight of striking mass: 50kg
freefall height: 0.5m
weight of striking system: 18kg
diameter of cone tip: 43.7mm
area of tip base: 15 cm^2
rod length: 1m
weight of rods: 6kg/m
depth of first rod to joint: 0.8m
tip penetration: 0.2m
cone tip angle: 90degrees
this is the information that was provided to me. let me know if this is not the data that you need. thanks for your help.
RE: Dynamic Penetrometer (DPH) conversion
RE: Dynamic Penetrometer (DPH) conversion
RE: Dynamic Penetrometer (DPH) conversion
This is a basic technique we use sometimes in the UK depending on site conditions. From the details above I can see that you are using the DPH setup (Dynamic probing Heavy. See BS 1377:1990 Soils for Civil Engineering - In-situ testing (Page 23!!)
The results should be presented to you as : the number of blows per 100mm (N100). This method is slightly different from the traditional SPT used on cable tool rigs, but many generalised comparisons can be drawn.
The comparitive N value can be derived: N = 2 x N100. Basically the sum of any two increments on the rods.
WARNING that this is very generalised. I'd use the comparision as guidelines only - I would not use these for design purposes.
RE: Dynamic Penetrometer (DPH) conversion
RE: Dynamic Penetrometer (DPH) conversion
RE: Dynamic Penetrometer (DPH) conversion
My library of BS is pretty large.
RE: Dynamic Penetrometer (DPH) conversion
Is there a URL to get a copy of that standard (assuming it isn't too large)?
thanks
RE: Dynamic Penetrometer (DPH) conversion
RE: Dynamic Penetrometer (DPH) conversion
There is a website called 'tionestop.com' (ti = technical indexes)whereby the documents can be accessed. You'd need to log in. But that is the best that I can do.
regards
soiledup