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Thanks fr the reply. There is a layer of loose to medium dense sand about 4m thick that our slope stability analysis indicated did not have an acceptable FOS (i.e. < 1.5)The piles extneded to approx 8m bgl. As the sides of the building rise approx 6m above the ground, there woudl have been...

Does anyone know of any work in connection with wind causing vibration that led to piles settling through loose to medium dense silty sands? We have just withstood a storm that has led to some settlement damage on a house on a very exposed coast. The house was designed in accordance with the...

Prof Mick Pender of Auckland University NZ has run courses with good notes on Limit State design. Try contacting him via the Uni, though I'd heard he was on sabbatical. Still e-mails should be passed on. Gareth Williams Geotechnical Engineer, Auckland New Zealand

Thanks, We plan on using a barrier pile wall (soldier pile). MSE/SRW walls probably won't work due to limited extent available for geogrid length. Tie backs are under consideration, but again due to limited site width behind the wall, they may not be feasible. Cheers Gareth Williams...

Hi, We are about to try to design a retaining wall for a 15+m height of weathered volcanic ash above a 'soft' sandstone. Does anyone know of any simple way to calculate the embedment depth required to achive a cantilever action? All we have is a dynamic probe blow count on the sandstone at the...

Previously I have been given a correlation of SPT "N" = (Sum of DCP blowcount over 300mm[1foot])/1.5. Has this been updated? Also has anyone seen a realistic correlation from SPT "N" to shear strength? [bigsmile] Gareth Williams Geotechnical Engineer, Auckland New Zealand

You could also use Galena as your slope stability analysis package. Very useful and you can combine both c' ,phi and Hoek Brown criteria very easily. The new version (4.0 recently available), also includes a probability analysis tool Gareth Williams Geotechnical Engineer, Auckland New Zealand

Thanks that's the info I needed. Regards :-D Gareth Williams Geotechnical Engineer, Auckland New Zealand

Does anyone have a cost for blasting of hard rock in small quantities (say up to 1000m3) as oposed to rock breaking. I need some comparative costs only, so costs from different parts of the world will be great Thanks Gareth Williams Geotechnical Engineer, Auckland New Zealand

Yes we only need an estimate of the CBR. Its being used as a &quot;control&quot; tool for checking on fill compaction quickly. The only reason I mentioned the shear vane was that with a shear vane the engineer needs to take the dial reading and then correct it. Similarly with the SACP Mexe...

The calibration that has been done has provided a graph relating the Dial readings marked &quot;CBR&quot;, to Newtons. What I was asking is if anyone knows of the correlation between Newtons and the real CBR value. Basically I need to be able to read the dial reading and then read off a direct...

Does anyone have a correlation between CBR and the Mexe-Probe or from Newtons to CBR? We have a SACP (Mexe-Probe) from CNS Farnell that has been calibrated but the calibration only gives us CBR vs Newtons. Can anyone help?