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  1. claytill

    End Bearing Values for cast-in-place concrete piles in dense gravel??

    I am working on a project where we have heavy vertical loads (1200-2500 KN)to be supported by 760 mm diameter drilled cast-in-place concrete piles. The water table is below the maximum depth of the pile, which is ~15 m. My research on maximum end bearing values for piles in dense gravel yielded...
  2. claytill

    Frost jacking of driven steel pipe piles

    The design of Lightly loaded unheated structures that are supported by driven steel pipe piles is often governed by resistance to frost jacking. I have often seen Geotechnical reports state that piles should be driven a minimum of 6m. The same reports typically give an adhesion value for frost...
  3. claytill

    Compacting Frozen Soil

    I agree with you boffintech - I would love to relax the spec and stop testing, but the client insists we continue to test. And again, you are right that the client will likey have selective amnesia and say "well we achieved 95% on all the fill...it should fine right?". I have recommended...
  4. claytill

    Compacting Frozen Soil

    Thanks for your opinion, which parallels mine - the letter was send to the client immediately after they informed of their plan and they have been informed that this is not acceptable. The client is bound to backfilling this area by a contract and I have informed them that there is a...
  5. claytill

    Compacting Frozen Soil

    Background: I am overseeing a project in which we have encountered freezing air temperatures and recommended to our client that the imported fill must not contain frozen soil. The client decided to continue to immport frozen material and instructed us to continue with the 95 % compaction spec -...
  6. claytill

    Trafficable surfaces above 60 mil HDPE Liner System??

    I am currently designing a sludge pond that will require cleanout ~every 2 to 3 years. A trafficable surface is required to support cleanout equipment and our design consists of roller compacted concrete (150 mm), underlain by 3/4" crushed road gravel (200 mm thick),which is underlain by a 32 oz...
  7. claytill

    Horizontal Subgrade Reaction in "Peat"

    I was wondering if anyone has any experience estimating the horizontal subgrade reaction in "Peat"? The application is for a horizontal bend in a 42" pipeline (pressure unknown)that is ~2.5 m deep. We will likely be completing some field sampling to classify the peat. Also, any advice on...
  8. claytill

    Tank Loading on Fill and Preconsolidated Peat

    Thanks BigH! The tank is for a cautic solution to treat acid water. Also, the GWT is ~3.5 mbgs. Any other comments would be appreciated.
  9. claytill

    Tank Loading on Fill and Preconsolidated Peat

    Scenario: A 4.3 m diameter and 3 m high tank is to be founded on the following soil profile: 4.5 m of sand fill (N=16), 1.5 m of silty clay fill (remolded till N=10), 1.1 m of peat (N=8), 4 m silty clay (N=5), and silty clay till below. The fill has been in place for ~15 to 20 years with an...
  10. claytill

    End Bearing piles in Lacustrine Clay?

    I am working on a getechnical investigation in which there is a 10 m thick layer of lacustrine clay overyling clay till. My querie is as follows - is it common practice to use end bearing (under-reamed belled)CIP concrete piles in a lacustrine clay? If so, what bearing capacities would be...

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