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  1. BigHarvey

    Construction vibrations

    As a court expert I have a case where I believe damages have been caused by construction vibrations (rock removal or micropile drilling with DTH hammer at 6 m from structure). I am looking for data about vibrations (PPV) caused by thes two construction activities. I attach a picture of the most...
  2. BigHarvey

    trenie pipes cpncreting

    Are you sure you are using the right wire ropes ? Connecting parts and wire ropes are designed as a whole with very strict tolerances. You should not use replacement wire ropes which are not strictly the right ones. If you are using tremie pipes longer than 70 m wire ropes get smashed because of...
  3. BigHarvey

    Driven Pile vs Vibrated Pile

    Only drawback is that there is no way to check bearing capacty with driving formula as for driven pile. We generally drive the pile fast with vibratory hammer and then use an impact hammer for the final set. Make a load test if you use only vibratory hammer.
  4. BigHarvey

    Retwalls - Help !

    You can also talk to your students about an alternative called Texsol. It's a mixture of sand and continuous fiber showing both apparent cohesion (0.1 MPa) and a good friction angle. It's used as a retaining structure (can be theoretically vertical, but paractically limited to about 80°). See...
  5. BigHarvey

    Bored Pile Detailing

    Agree with you MTNClimber but when cut-off level is below Platform level it's not possible to trim off fresh concrete.
  6. BigHarvey

    Bored Pile Detailing

    when drilling Under bentonite or polymer, the concrete coming from the bottom of the pile might be slightly contaminated with soil. This is why it is necessary to cast between 0.5 and 1 m above cut-off level. The concrete will be trimmed off at a later stage. In order to trim it off properly you...
  7. BigHarvey

    Partial landfill mining

    Dynamic compaction has been used several times for such a case. You can expect the compaction process to lower the Platform about 25% of the waste thickness.
  8. BigHarvey

    Cement-Bentonite Slurry

    It has already been done, in my case replace bentonite slurry by BC slurry in a slurry wall 50 deep and 1 m wide. You must be sure that your CB slurry is stable which means good hydratation of mother bentonite slurry and enough cement ( around 180 to 200 kg per m3).Obviously you will get, just...
  9. BigHarvey

    Choice of a ground improvement/reinforcement technique

    Each ground improvement method has its limits in terms of magnitude of load, thickness of layer to improve, grain size distribution, etc, etc. Each site is a particular site. Hence, each project is a prototype and you will not be able to replace engineering judgement by an Excel spreadsheet...
  10. BigHarvey

    What is best practice for piling where thin layers of clay-rock-clay-rock are present?

    Richard Any Site Investigation company in the UK will do the job. Hiring them might prove useful in the way that it's very likely that you don't need deep foundations. Your Structural Engineer is not a soil specialist. If anyway you need deep foundations see Roger Bullivant in the UK, they...
  11. BigHarvey

    Stabilization of sand dune in seismic zones

    Have a look at Texsol This material is a mixture of continuous thread and sand. It has an apparent cohesion of 0.1 MPa and a very high friction angle and can be used as a retaining structure almost vertical. http://www.eiffageinfrastructures.com/texsol
  12. BigHarvey

    Mexico City Hotel Lobby

    It is probably a true story. One of my soil mechanics teachers told us in the seventies that you could guess how building were founded in Mexico : the piled ones had stairs going up from the street and those on mats had stairs going down !
  13. BigHarvey

    Mysterious Boring Log Description

    "Destructif" means they used a destructive drilling method and were not able to put a description in front ! The problem is that they don't describe the destructive method they used and they didn't record drilling parameters therefore it doesn't give any information at all ! Was it necessary to...
  14. BigHarvey

    ACIP-D (Displacement ACIP Piles)

    - How much reduction in spoils can be expected? when you withdraw your tool line, a reverse auger will displace what has been falling during drilling in the annular space. Therefore you will have a very nominal amount of spoil after finishing a pile : roughly the volume of soil in the...
  15. BigHarvey

    Tension Pile Load Test

    You can use O'cell technology if the pile is not already cast.
  16. BigHarvey

    What is the best pile drilling method in loose clay?

    Pile déviations are very important for a rotary pile, hence my comment on CFA. Anyway don't use tangent piles. You should also, if not done use guide walls to position accurately the piles and control verticality. Casing the full length of the pile will help you for verticality because of the...
  17. BigHarvey

    What is the best pile drilling method in loose clay?

    Your "tangent" piles wall has certainly been constructed with a CFA rig. You have what you paid for : low cost job. If you want a "nice" wall then go for secant piles, either cased CFA or cased rotary. This will ensure verticality good position of piles. One problem with soft clays is that you...
  18. BigHarvey

    Adequacy of Geotechnical Report - Pile Bridge Foundations

    You mention that originally the bridge should have been supported by shallow footings. The owner wants a piled structure and the reason is certainly for protection against scouring. The only important information, which should be part of the report, is the possible depth affected by scour.
  19. BigHarvey

    Problem with Dirty Concrete - Bored Piles

    Hi cgseso You should not have problems concreting dry. I believe the sonic tests can be questioned. However if the slump value of the concrete is not maintained above 16 cm during the complete concreting section you might have dirty concrete inclusions in the sound concrete. This is because the...
  20. BigHarvey

    Problem with Dirty Concrete - Bored Piles

    If you have been concreting in a dry hole, it's most mikely the sonic tests that can be questioned. Locate a shallow identified defect and excavate around the pile to expose the defect. If no defect is found you will have your answer. Check if the sonic tube are mada of steel. PVC should not be...

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