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  1. tpk72

    SPT overburden correction for offshore borings

    General questions on the overburden correction (Cn) for SPT. 1) For offshore drilling, the weight of the water column should be included in the effective overburden pressure calculated, correct? This isn't deep drilling, we are looking at 20 - 30 feet of water above lakebed materials. 2) In...
  2. tpk72

    Graffitti/ Murals on floodwalls

    I have a structural engineer who has said that murals on floodwalls can cause damage, as the paint creates a seepage barrier and can increase freeze/ thaw damages to the concrete surface. I have seen several floodwall projects that have extensive murals, but they tend to be in warmer...
  3. tpk72

    Consolidation vs. Displacement

    I have a project where we will be creating a wetland by filling in an old canal that is currently submerged with up to 10 to 15 feet of free draining fill. In the canal, there is approximately 10' of extremely weak silts (c~40 - 80 psf) before hitting stiff clay. We will likely place a...
  4. tpk72

    Lateral earth pressure - short term and long term analysis

    Right oldestguy - I should have included that in my discussion. Thanks!
  5. tpk72

    Lateral earth pressure - short term and long term analysis

    I want to make sure I have a good understanding of the term effective stress, and how it impacts short and long term analysis (lets say a sliding analysis). If you are calculating lateral earth pressures, your vertical stresses will be the same for long term or short term analysis, correct...
  6. tpk72

    Question on typical engineering properties table 8-3.1 in UFC 3-220-01N

    The referenced table provides typical shear strength of compacted soils by soil classification. Footnote 2 states that strength characteristics are for effective strength envelopes. For cohesive soils, the table provides the following values for CL soils: CL: cohesion (as compacted): 1800...
  7. tpk72

    Looking for typical drained shear strength values for CL

    I have to do a preliminary levee design for a project, but the borrow source for the clay has not been identified. I have found typical values for undrained shear strengths, but I'm having trouble finding typical drained values. I don't anticipate any issues with stability (relatively short...
  8. tpk72

    Question on primary consolidatoin settlement formula

    Thank you!
  9. tpk72

    Question on primary consolidatoin settlement formula

    Excuse me if this is a daft question, I'm sleep deprived due to wonderful baby boy :) Looking at the Primary Consolidation equation, (S=CcHc/(1+eo)* log.... Your primary settlement goes down with higher initial void ratios. This seems counter-intuitive to me. What am I missing? Thanks!
  10. tpk72

    Selecting shear strength data for semi-compacted clays

    The berms are a max height of 8', and are being used to contain dry river sediment. The semicompacted reference comes from a US Army Corps of Engineers manual for construction of containment facilities for dredged material. Table 6-9 in Chapter 6 states that semicompacted dikes can be...
  11. tpk72

    Selecting shear strength data for semi-compacted clays

    The soils are a lean CL, with LL ~34, and PI ~21. Sand content varies, but is typically 16 - 20%. Slopes are very flat for most of the project (7H:1V), but there are a few stretches of 2H:1V. I need to let the designer know if these need to be flattened. I have seen some references to "semi...
  12. tpk72

    Selecting shear strength data for semi-compacted clays

    I have a geotechncial investigation report for a berm construction project in which the following is included: *boring logs w/ blow counts *index testing * Unconfined compressive tests on in-situ foundation density *standard and modified compaction *hydraulic conductivity tests on in-situ...
  13. tpk72

    Settlement of organic silt

    All of the equations I have come across for settlement calculations differentiate between cohesive and cohesionless materials. How do you calculate the settlement of organic silts? (ML/ OLs)? It is all weight of hammer blow count material (lake bottom), and has low cohesive values. Do you...
  14. tpk72

    Typical drilling production rate, continuous sampling

    I'm trying to negotiate a contract for a drilling job that has continuous sampling for a depth of 20'. Just curious if anyone out there has a rule of thumb for continuous sampling. I typically use 5' spacing, and I don't have a great feel for how much continuous will slow down the process...
  15. tpk72

    Verifying load capacity of H-piles driven by vibratory Hammer

    I am looking at driving H-piles at a site that has a deep (~150') layer of loose silts before hitting hard pan clay. I would like to use a pile driving analyzer to verify pile capacity, or at least get blow counts for the end bearing material, but my customer is leary of bringing any impact...
  16. tpk72

    Determining strength parameters, literature recommendations

    Hello, One of the most challenging issues for me is establishing strength parameters for soil, particularly when the data comes from different lab tests conducted over a span of many years. Can anyone recommend any good literature/ text books on developing soil profiles or determining...
  17. tpk72

    Determining axial loading for CU tests

    I apologize for posting such a basic question, but what is the proper way to determine the axial loading for CU triaxial tests? Thank you
  18. tpk72

    Construction equipment surcharge Loads

    I'm running a slope stability analysis for a stone causeway. What surcharge load would be appropriate for a 40 ton dump truck? I'm looking at a spec sheet, and it looks like the total laden vehicle weight is 138 kips, with a footprint of 18.5' x 10.5'. That would get me to a 710 psf loading...

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