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  • Users: palmahouse
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  1. palmahouse

    Horizontal Arching and Lateral Earth Pressures for Square Shaft Excavation Supported by Sheet Piles

    Is anyone aware of a rational (and simple) analysis approach for evaluating reduction (or increase) of theoretical average lateral earth pressures imposed on a retaining wall, relatively short in plan, with 90-degree "return" retaining walls that abut the wall ends? This is for temporary...
  2. palmahouse

    Expansive Soil Remediation - Ionic Chemical Treatment

    My project team is considering ionic chemical treatment to reduce shrink/swell behavior of expansive soil beneath an existing buildings. The subject building is a one-story CMU skilled nursing structure with a concrete slab-on-grade floor and shallow footings. The damage is likely caused by...
  3. palmahouse

    Fill Settlement

    Does anyone have a good reference for estimating long-term total settlement of compacted artificial fill under its own weight (strain - or percent compression) based on soil index properties (or fill classification)?
  4. palmahouse

    Subdrain Trench Waterproofing

    I am designing a subdrain and would like to call out for "waterproofing" on the downslope side. I have not designed one like it in quite some time. I used to call for 15-mil visqueen for this application, but, I would like some advice. -Does the burried visqueen hold up over time? I ask this...
  5. palmahouse

    Underground Excavation Support Design - In-Situ Horizontal Stress

    I am designing support systems for underground excavations, and have been using a stepped evaluation approach presented in Underground Excavations in Rock (Hoek and Brown). The procedure is a good guideline for my projects, however, I deal with underground excavations that are typically less...
  6. palmahouse

    Laterally Loaded Battered Micropiles

    I am working on a project where micropiles are proposed to support a building with design seismic lateral loads. The literature indicates that battered micropiles should be considered because of the low lateral capacity of vertical micropiles. I calculated allowable lateral loads for...
  7. palmahouse

    Soil Nail Pullout Test

    The FHWA design manual says that you should zero out the deflection dial gage at initial alignment load and record your deflections at every incremental load and incremental time from there. One "failure" occurs if your deflections, as measured using the procedure described above, are less...
  8. palmahouse

    Shrinkage Cracks in a Shotcrete Retaining Wall - Steel Requirements

    I am evaluating whether additional reinforcing steel is required in a shotcrete retaining wall (with soil nails) to reduce shrinkage cracks. Overexcavation was required to construct the wall. The average overexcavation depth (thickness) is about 4 inches, and is up to about 16 inches at some...
  9. palmahouse

    SRWall

    Does the latest version of SRWall allow you to model a pyramid-shaped gravity retaining wall with multiple units at the bottm course (in section) and one unit at the top course?
  10. palmahouse

    Trench Plugs

    Do you recommend placing trench plugs where utilities are long runs down slopes flatter than 2:1? Bedding sand will have a sand equivalency of at least 30 and will have little percent fines. If so, do you recommend them for 3:1 or steeper, 4:1 or steeper, etc.? What minimum spacing for...
  11. palmahouse

    Settlement of Large Footing (Tank) on Sand - Best Estimation Method

    What is your opinion on the most appropriate calculation method for evaluating total settlement for this problem?: A 115-foot diameter prestressed concrete tank (about 30 feet of liquid) on a 300-foot thick deposit of alluvial silty sand (SM) with interlayers of sand (SP) and sand with silt...
  12. palmahouse

    Shotcrete Wall over Rough Rock Surface - Chain Link Fence Reinforcemen

    Poll: Has anyone used galvanized chain link fence, as opposed to welded wire fabric, as reinforcement for an engineered anchored shotcrete wall placed over a rough bedrock surface? I figure that one advantage of using fence is that it is more "conformable" to the rough surface compared to...

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