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  1. qhtony

    i need a method of statement for " CMC" or columns controls modulus

    CMC is a proprietary product, talk to their representatives in your state.
  2. qhtony

    New Piles to be installed under an existing in service Abutment

    jhgestimator, I think the problem you described lies in two scenarios: 1. Settlement of the bridge abutment caused by consolidation of the expansive clay 2. Deformation of the reinforced fill (which in turn affects the bridge abutment) caused by the shrinkage/swelling of the expansive clay. As...
  3. qhtony

    Packer Test Calculation

    Hi BigH, the reason being the client may opt for a spreadsheet for either better presentation or for an appreciation of the calculation process (as there are quite some variants in computing the permeability in packer tests, based on some literatures). But certainly hand calcs are good as well...
  4. qhtony

    Packer Test Calculation

    Hi guys, I was required to carry out some packer test in the field recently and just wondering if anyone has a program/excel spreadsheet handy to interpret/compute the data?
  5. qhtony

    Estimate of Drained Young's Modulus E' of Clay

    To paganel: for the use in my model, it is a constrained modulus. you're right. triaxial CD with specified cell pressure will give me the E' I want.
  6. qhtony

    Estimate of Drained Young's Modulus E' of Clay

    Hi Guys, Got a problem that has annoyed me for a while. I understand drained Young's Modulus E' of clay can be obtained from Oedometer consolidation test in the Lab; and there are also many published correlations between CPT qc, relative density and E' for SAND. However, I was wondering if...
  7. qhtony

    Staged Construction of Embankment

    Thanks for your advice, Drumchaser. I wonder if you have a set of specification handy for the type of works you did in your area? Cheers,
  8. qhtony

    Staged Construction of Embankment

    Hi guys, see if this illustration helps (excuse my terrible drawing). http://files.engineering.com/getfile.aspx?folder=47518d69-4dd1-4b16-b806-ff4fdf452fac&file=drawing1.pdf
  9. qhtony

    Staged Construction of Embankment

    Hi guys, I've got a little bit more information on the project. I've been given a photo of the site(see attached). The stage 1 embankment has a temporary wire mesh/geotextile faced temporary retaining wall due to the limited space. And during the compaction at near the temp. retaining wall...
  10. qhtony

    Staged Construction of Embankment

    There is traffic on stage 1 already and the construction is about to finish (not paved yet) on Stage 2. The crack is already developing in between stage 1 and stage 2. We didn't notice any lateral movement, maybe it's too little to observe.
  11. qhtony

    Staged Construction of Embankment

    Hi Emmgjld, To your questions: embankment is constructed with common fill (mostly cohesionless materials + some cohesive) with soaked CBR specified as > 3. original subgrade is 1m basaltic clay underlain by basalt. The clay has a moderate swell of 2.5%. GW is well below the original surface...
  12. qhtony

    Staged Construction of Embankment

    Hi Ron, the embankment is about 6m high and pavement is just conventional asphalt, so it's flexible pavement rather than rigid concrete (I'm not so familiar with pavement works). Compaction for subgrade directly under pavement is 98% std and I think for rest of embankment is 95-97% std from my...
  13. qhtony

    Staged Construction of Embankment

    Hi Ron, at the interface between the two, there has been an obvious crack, or faulting. Photo's at work. Settlement does occur in the adjoining area between stage 1 and 2 and I think in exactly the same way as you, "it's difficult to compact this area". But it gotta be some construction method...
  14. qhtony

    Staged Construction of Embankment

    Hi guys, recently having a problem with staged constructions of high fill embankment. The embankment constructions were done in 2 stages to allow alternating traffic (i.e. stage 1 embankment constructed on one half of the road and then stage 2 on the other half of the road, following the...
  15. qhtony

    Estimating Eu using Su for clay?

    Thanks BigH. This is very useful.
  16. qhtony

    Estimating Eu using Su for clay?

    Hi F-d, it's a half-half. It's just my own interest in this subject. We've got software to estimate the deflection of lateral loaded pile at work. But I'm trying to develop a simple excel spreadsheet with minimal input of geoetech parameters (i.e. Su, PI) to estimate deflection. And the K value...
  17. qhtony

    Estimating Eu using Su for clay?

    Thanks BigH, I happen to have Tomlinson's book at home... Will have a look. cheers,
  18. qhtony

    Estimating Eu using Su for clay?

    Hi f-d, The ultimate goal is to find out Kh (horizontal modulus of subgrade reaction), which is dependent on d, Eu and poisson's ratio based on Vesic (1961)'s elastic theory. For clay with known undrained shear strength, using the formula above, Kh then can be determined. So is there any...
  19. qhtony

    Estimating Eu using Su for clay?

    Hi guys, I have been scratching my head off trying to find out the relationship between Eu (undrained Elasticity Modulus of soil) and Su (undrained shear strength of clay). However, literatures do not give a straight forward relationship between these two. Most of them are Eu=K*Su, but the K...
  20. qhtony

    Gravity base foundation for offshore structure

    Just wondering if anyone here knows any good reference books or papers (ideally online resources) for the gravity base foundation design for offshore structures? The vertical support is relatively easy to calculate using typical shallow foundation design principles, but offshore gravity base...

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