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Can someone tell me what k0 for normally consolidated Clay soils, in the drained and undrained condition is? TIA

Hi all, See below image. Is there a standard connection detail for connecting a reno mattress (riprap apron) to a concrete headwall. The ground downstream of the outlet is sloping and I dont want any movement of the reno mattress. Have considered fixing U bars into wingwall base and U bars...

Same question i posed last time re Oldest guy, where is Fatdad? He was a great contributor of soil mechanics topics. Enjoying retirement I think ?

Does any happen to have a spreadsheet with the above method that they wouldnt mind sharing. I

Hi all, Oldestguy has not been on the forum in a while. I know some guys keep in contact with him offline. I hope all is ok?

Ladies and Gents - is there a way to create raw excel data (i.e. organized columns and rows) when just given a high quality PDF graph. See below plot. I would like to recreate the graph in excel but done want to spend so much time in re entering data from logs?

Can someone tell me a reason as to why we cant use preliminary test pile (so a pile that has been loaded to 2.5 times its working/allowable load, maybe to failure, maybe not) as a working pile that will support the structure.

Hi all, I am working on a project that requires underpinning of a large structure which has settled excessively. We are asked to evaluate the use of micropiles to support the 800mmthk raft. Approx 1000mm of earth fill and a 200mm thk floating slab sit above the raft. The 168mm dia micropile...

Hi All, I have had a request land on my desk where a structural engineer needs a bearing capacity assessment of a foundation where the ground surface profile changes over the width of the bearing capacity failure wedge. I have indicated that the exercise is pointless as a 6m wide foundation...

Interested to know what people’s take on statistics is? Do many engineers use it on a day to day basis? Does it reduce the need for engineering judgement? An older engineer has told me that while engineering judgement is important, it is becoming less acceptable these days. I have used it...

Hi all, I need to work out the strap stress acting on a PE pipe. The pipe is 2.5m in diameter and placed on the seabed. The purpose of the strap is stablise the pipe against wave and buoyant forces. The strap is fixed to a concrete block either side of the pipe. Its an unusual temporary...

Hi all, The project is a retrofit of an existing 12.8m high x 48.9m dia tank supported on a 0.45m wide 2.3m deep ring foundation. Due to the retrofitting there will be an increase in loads. I am doing a check to confirm the existing reinforcement provided is sufficient. This involves revising...

I think most of the people that use this site come to discuss, learn, debate, argue, etc about geotechnical engineering. Its a great website that I dont feel guilty spending hours on. Better than spending hours looking at VR fail videos on Youtube (check them out, very funny, a personal favorite...

Hi all, Has anyone used Gneiss as an aggregate for structural fill? If so, is there any good FHWA literature on the material, which discusses its typical aggregate values like LA fragmentation, crushed and rounded particles etc. I have seen online that LA for Gneiss can range from 30-60. The...

Hi all, We are looking at a Breakwater, approximately 9m high with 4m above HAT plus climate change level. Hydraulic stability assessment requires rock sizes of up to 10-15 tonnes. We have been asked to provide a preliminary assessment of seismic stability of the breakwater. To do this we...

Hi all, I am working on a project where there is a debate as to how the material was QA/QC'd to 90% compaction (standard proctor), however after settlement of some infrastructural, the compaction level is ~80%. The material is well graded sand with trace fine gravel. One theory being floated...

Hi all, We are undertaking a preliminary assessment of a subsea pipeline located in 6m depth of water. The pipe will be trenched into very weak rock. I am looking for some references/codes to specify the pipe bedding and backfilling material for subsea pipes. Client hasnt confirmed what the...

Hi all, A bit of a trivial question..when the groundwater level is lowered (for whatever reason), a foundation resting on sand should suffer some additional settlement due to the increase in effective stress. When the groundwater level rises (again for whatever reason), there is a reduction...

Hi all, Settlement related query again... Interested to hear peoples thoughts on settlement calculations for large rafts/mats/slabs on granular soil. The company where i work now considers a foundation a raft where b x l is greater than 5 x 5m. Elastic theory is then applied using the...

Hi, Does anyone have any references for long term settlement in sand. Specifically I am looking to see if there are any arguments that say it can be limited to 5 or 10 years in sand as opposed to the lifetime of the structure. Schmertmann includes a C1 factor to account for long term...