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  1. ckissick

    Retaining wall with no subdrain

    We drilled three soil borings and did a few lab tests. There is stable bedrock at a depth of 7 to 10 feet. The landslide is not very big. 50 CY. The retaining wall will be a maximum of 4 feet tall, however we are neglecting passive resistance above the slip plan of the slide, since we can't...
  2. ckissick

    Retaining wall with no subdrain

    As I said above, the landslide mass will be removed and replaced with compacted fill on a benched cut. There's no sewer treatment plant in the area. It's rural, but a small lot. There's no room to relocate the leach field. Anyway, everything has been worked out with the County. It's just a...
  3. ckissick

    Retaining wall with no subdrain

    The complete picture: The ground above the retaining wall will be excavated, benched, and replaced as compacted fill. The slip plane will be gone. The uphill slope will be inclined at 4:1. The County will not allow weep holes or sand or any sub-drainage at all. There's a creek downhill from...
  4. ckissick

    Retaining wall with no subdrain

    That makes sense. Thank you.
  5. ckissick

    Retaining wall with no subdrain

    I have a landslide repair job with a proposed stitch-pier wall. There will be a leach field right behind the wall, so the permit agency won't allow a subdrain system behind the wall. The active soil pressure would be 50 PCF if it were drained. If pore pressures can build up behind the wall...
  6. ckissick

    How to counteract soil creep?

    Thanks for all the responses. I never wanted to treat it as a slope stability issue. The existing house is about 50 years old and the soil creep is very slow. The footings and deck piers have moved 2-3 inches in 50 years. It's just enough to warrant remedial measures. It's a classic case of...
  7. ckissick

    How to counteract soil creep?

    My other question is: Why don't any of my texts discuss the quantitative aspects of this issue? It would be a simple thing to describe. Is there a good text book that actually provides solutions to real-world problems in the realm of geotechnical work on houses?
  8. ckissick

    How to counteract soil creep?

    Thanks for the response, moe333. Two questions: How conservative is it to use passive? It seems like not all the passive would be mobilized in such a situation. Also, what would be the shape of the pressure distribution? A normal triangle for conventional passive? And should I neglect the...
  9. ckissick

    How to counteract soil creep?

    Problem: 50-year-old house on a steep (~40 degrees) slope, 5 feet of medium stiff clay over bedrock. Clay has PI=34, SPT blow counts ~10. House is on shallow spread footings, and the lowermost footing that runs parallel to the slope is rotating, and the deck piers below the house are...

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