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  1. geomtl

    Basement in Ground Water

    Having both worked with clients and remediated an old building that I bought with ground water problems I would highly recommend bringing the basement above the GW level. No matter what you build there will be problems down the road, and homeowners are notoriously more sensitive to water than...
  2. geomtl

    failing compaction efforts in silty/sandy material

    by the time you have a few proctor values in a native material (or a fill if fairly uniform) you should be able to estimate the insitu density value pretty good based on the moisture content and the way in which it packs. You should also know by this point if the material needs water just by...
  3. geomtl

    Stability Analysis of Limestone Quarry

    We have been asked to determine the stability of the rock faces of an existing limestone / dolomite quarry. The owner is proposing a residential development inside of the quarry. (it has an open side to the river) We did some initial structural mapping and discovered two major joint sets...
  4. geomtl

    Pyrite in Aggregate

    In Quebec (Montreal area) we have had extensive problems with expansion of granular materials below slab on grades. In particular, this phenomenen is extremely dangerous on lightly loaded slabs as found in homes. In many cases, the homeowner has to completely remove the offending materials and...
  5. geomtl

    Settlements due to dewatering

    In rsponse to your questions: 1) we have performed 5 boreholes to 70+ feet across the site. We appear to be in a faulted rock, with solid bedrock dipping steeply (70-80 degrees) across the site. The soils range from solid breccia limestone to faulted rock (boulders and cobbles with sand and...
  6. geomtl

    Settlements due to dewatering

    thank you for all your responses, sorry, called it waterproof to refer to either a slurry wall or sheet pile type shoring as opposed to wood lagging and soldier piles. thanks,
  7. geomtl

    Settlements due to dewatering

    thank you for the responses, in Mexico city what was the drawdown and what are the soils?
  8. geomtl

    Settlements due to dewatering

    Hello, I have a question, in my experience in the field of geotech engineering we always warn of the danger of settlements to adjacent buildings caused by local dewatering (deep excavation below the water table adjacent to existing buildings on standard spread and strip footings.) I recently...
  9. geomtl

    Vibration reduction methods for building foundation

    thanks for your input, fortunately we have a vibration control division, and they will be doing some monitoring in the near future, will keep you posted, cheers,
  10. geomtl

    Vibration reduction methods for building foundation

    Hello, I have a client that is proposing to build a hotel (7 stories, concrete construction, basement level at 2.5m). The hotel will be adjacent to a railway mainline, with the tracks approximately at the same level as the finished ground level of our building. The edge of the building will...
  11. geomtl

    Design of Friction Piles

    thank you very much for all your suggestions. I will look into the problem some more and offer some feedback when I get it setup, and of course this will all be reviewed, my director has extensive experience in these types of problems, I was hoping to go to him with a bit of direction first...
  12. geomtl

    Design of Friction Piles

    I have a site with 20 feet of very soft silty sands with thin interbedded clay layers (N values of 2 - 4), followed by a compact becoming dense to very dense silty sand with trace gravel. This strata extends to 100 feet where we stopped drilling, assuming we would go with a friction type pile...
  13. geomtl

    Dewatering of Silts

    I have an excavation extending 25 feet below the ground surface in compact to dense silts with trace sand. The GWT is located at approximately 15 feet. Excavation below the GWT as can be imagined is difficult, with the saturated soils very susceptable to remoulding with a minimal amount of...

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