lightweight dynamic cone penetrometer(DIN 4094)

[dyawosei]

I want to use a German type lightweight dynamic cone penetrometer(DIN 4094)to determine the allowable bearing capacity as part of a ground investigation. I remember sometime ago I read that ten times the N10 value gives the allowable bearing capacity in kPa.Can somebody confirm this or give me the correct relationship between the two parameters?

 

[BigH]

I am not familiar with DIN 4094. Is this the same as TRL's mini dynamic cone used in highways? In Malaysia, they use a Mackintosh Probe (probably similar to what you would use). -

http://www.foundtest.com.my/services/mpt.html

Also Check:

http://nrmt.files.wordpress.com/2010/02/513-week8.pdf

 

[Mccoy]

BigH, the european lightweight (DPL) is similar in concept to the Macintosh probe although a little different, a heavier weight is used and blowcount is every 10 cm. Many professionals regard it as a toy, not fit to yield quantitative values of geotechnical parameters, good for shallow layers thickness though, if soft.

 

[BigH]

I personally like the Canadian pentest - 60deg cone driven with SPT hammer and drop. This is not a toy! Always found it very useful.

 

[Mccoy]

BigH, the pentest is probably similar to the super heavy dynamic probe, which has an impact energy similar ot larger than the SPT.

I concur it's very useful, unless the soil is cohesive and the drillpipes start sticking to the borehole, creating fallaciously high blowcounts. Cohesive soils are the realm of the static penetrometer.