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Casimmons, thanks True, no information is yet availble regarding the depth of fill and nature of mateial underneath....thats way I am heading for detailed investigation. Vibrofloat , we have some experince with it in densifiying material up to 6 inches I am not sure if it would help in the...

Thanks all for your valued contribution. I am in the opinoin to proceed with test hole drilling to identify bedrock depth, rock fill and overburden thickness. Rock fill apparently did not placed in controlled manner I ll subcut to some depth, I am estimating bout 2.0m and backfill the same...

An industrial plant location have been chosen by the client. The selceted location is a disposal area of mine's rock waste. The material is heterogenous uncontrolled crushed rock of sand to boulder sizes up to 600mm in diameter. Some of the waste is proceesed product and is "oxidized" which...

Thanks BigH for the response and clarification... I thought you are the same person. Thanks again BigHarvey.

BigH and ntschwanz Thanks for your response. BigH , the concern is surface and shallow obstruction not deep obstrcution. what is the approximate equivalent SPT "N" to the CPT "qc" youy did mentioned. K

Hi As all you may know it is possible to encounter near surface obstruction during installation of Prefabricated Vertical Drains PVD ... I understand that pre augering ( or other method may be chosen by the Contractor) is used to clear the obstruction for a certain depth to facilitate the PVD...

Hi Opham this problem happens if approach settlement is not well addressed at advance . Normally there are some requirements regarding eveness of the pavement surface using 3m straight edge in longitudenal and transverse direction. It may be the bridge owner have a criteria for total post...

Hi, I am designing an embankment with preloading and PVD installation, we did define the critera at the end of preloading and we have a generous preloading period of 3 years it comes up that drains spacing to be 3 to 3.5 m depending on fill height. Any one have an experience with PVD in such...

Thankk you cvg and civilperson. CD

Thanks BigH -the hole to be used is 450mm, holes up to 300mm in dia had experienced clay squeeze in bottom. -the plan is to use roding or jetting to achieve compaction. - from yours and other reply it seems that 90% relative density requirement on high side...Any other figure beside 70% of...

cvg and GeoPaveTraffic thank you for your comments. -The vertical sand drains is to be installed 20m deep in firm becoming soft clay. -the reason behind 90% relative density is to prevent any possible squeeze of clay inside the hole and ensure the column of sand is there in full section...

Dicksewerrat -it is vertical sand drain there is no wrapping at all. - yes, there is gradation spec for backfill material.

Hi, A Specification for vertical sand drain says that sand should be placed into holes as: "Sand shall be placed to attain a relative density of 90 %". Is it necessary to define this requirment? How to ensure this requirment is achieved, what test? thanks CD