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Ah, that's where it gets confusing. The results I've had from a lab were for tests through large cored holes, on a slab sub-base of granular material. They quoted CBRs of 12-40 (so were considered reasonable; some areas had failed). These results indicated that the calculation had been done...

There is a formula for obtaining the CBR value from plate bearing tests in the UK DMRB, IAN 73/06. It is CBR % = 6.1 x 10^-8 x (k762)^1.733 There is no worked example in the current version of this document. An example in an older version (DMRB Volume 7 Section 2 Part 2) suggests that the...

I've seen a timber cladding detail roughly as follows: Short sections of 152 x 152 x 19mm steel angle welded to piles vertically at 900mm centres, with 150 x 150 vertical timbers (full cantilever height) bolted onto each side of the angle. Then 50 x 150, 2.4m long planks are slotted in behind...

I'm working on an electrical substation on a river estuary site in England. The ground investigation has found that the site is underlain by around 5m of pulverized fuel ash fill, over about 6m of alluvial soils, the top 3m of which is fibrous peat. Below the alluvium are river gravels and...

The known 'problems with highly plastic clays' suggests to me subsidence being caused by desiccation of the underlying clay soil, rather than a water main/drain leakage issue. Has there been a long period of dry weather? Is there significant vegetation near the house? You won't know until...

In the UK we would generally ignore cohesion for design of retaining walls, except for temporary walls. 14 degrees implies either a clay with a plasticity index over 80% (extremely high, for the UK at least) or a clay with evidence of past movement (polished or striated surfaces within the...