Have tried and tried and tried...us Geotechnical engineers are bottom of the food chain, the STR guys don't think it's worth their time and effort to tell us things like loads, levels, settlement tolerances and all the other useful stuff that makes our reports a whole lot more relevant to their...
Thanks for your help. I'm not actually trying to calculate the exact design loads, just trying to get an idea, 1kPa, 5kPa, 10kPa, etc. What I'm trying to second guess is whether the columns can be supported on pads, or will they need piling. Being a geotech, I have no real idea how much a car...
Thanks, I was hoping someone has experience in designing these things and could give me a ball park figure. KPa for the deck area would be fine, I could turn that into column loads based on the span...
I'm a geotechnical engineer not a structural engineer!
Hi, Geotechnical engineer looking at FNDs for single deck of car park, what sort of column loads could be expected for say 9m spans? The client is adding a raised car park deck to provide additional parking, so it's only one deck that will be supported.
Also, what sort of differential...
Excess pore pressure is pore water pressure generated by loading the soil. Imagine a sponge soaked with water. If you load it (push down on it) water comes out, exactly the same sort of thing happens when you load soil, you try and squeeze the water out of it. However, clay soil is not very...
Thanks for your replies. It's for an inclinometer. I am asking them why they are specifying such a strong mix. 7Mpa will be impossible to acheive, not to mention pointless for its application! I suspect they have got their numbers mixed up somewhere.
I need to design a pile mat / working platform on a sloping site. BRE470 is only intended for maximum slopes of up to 1 in 10. Does anyone have any guidance for steeper slopes? Still waiting for the dwgs before I'll know exactly what gradient I'm looking at.
My gut feeling is that it...
Hi, you need to be looking at effective stress parameters for slope stability, shear vanes give total stress parameters! Use effective cohesion (c') of 0kPa, and base your friction angle (Phi') on PI correlation (I'll try and find one for NC clays) or do expensive consolidated undrained...
Lab triaxial data needs to be very carefully appraised. Usually the stress ranges the testing is carried out under is far greater than the stress range you are looking at for slope stability problems. The errors from testing (say 5% of the normal stress) can shift your Mohr circles left or...
You need some geophysics. A combined compression wave and shear wave (P and S) survey will get you (if you can provide bulk density) the dynamic shear modulus, which is a low strain shear modulus. From this you can calculate all sorts of dynmaic reactions, such as rocking spring stiffness etc.
Not sure what kind of ret wall you have, but be carefule compacting soils behind a RW, you can easily impart excessive lateral pressures on the back of the wall. Again, not sure if any drainage has been incorporated by free draining backfill is desirable to prevent pore water pressures building...
We are talking 3 to 5MW turbines, 1,500 tonnes, moments up to 60,000kNm. The turbine manufacturer will construct 20m diamater mass concrete bases and appears to be looking at spread FNDs. Personally, I would pile the bugger to bedrock!
Any ideas on estimating settlements under dynamic loads...
