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  1. phillyfrank

    A rock mechanics question

    Backfill has many good points. If the load bearing is a sensitive or valuable structure, backfill the void, or excavate it out. Drill hole cameras can be placed to survey the void and its condition. Good luck, indeed.
  2. phillyfrank

    A rock mechanics question

    This is NOT a simple question. It is a highly three-dimensional problem. You will be best modeling the situation using some finite element or discrete element code -- not for amateurs. Simple beam theory does not account for the geometrics and fracturing.
  3. phillyfrank

    Visibility on Mining haul Roads

    Best thing is a tall fluorescent red flag to get above dust and to be at truck driver's eye level. Also, flashing light helps. Also in the US, NIOSH (former USBM) has done a lot of work on this topic. They are at http://www.cdc.gov/niosh/mining/default.htm.
  4. phillyfrank

    Anchor bolts - Galvanized or not?

    This is not really my field, but I have done a great deal of work in rock reinforcement and ground anchors. Galvanizing would be breached during torqueing, when the threads would be in tight contact. There are any number of protective coatings that can be painted on after the installation.
  5. phillyfrank

    Engineering property of Rock mass

    Chunil -- Is anchorage in tension or compression? Have you drill out to define weatherng depth?
  6. phillyfrank

    Determining Ca/Mg in Limestone rock

    This is an everyday problem in the chemical lime and portland cement quarry/mine industries. There are numerous labs that offer this service. Sampling must be done properly to avoid contamination and misrepresentation. Are you using diamond holes, rotary holes, RC holes, bulk?
  7. phillyfrank

    Engineering property of Rock mass

    Chunil -- What is it you are trying to do? What are you building/excavating? What rock mass propertiess do you need? I think you are discovering that you are in that never-never shadow land between rock and soil, where neither rules do well.
  8. phillyfrank

    Information on Maurice Walmer, P.E.

    Try these sites: http://www.wtblock.com/wtblockjr/first2.htm http://www.fbcpn.org/history.htm http://www.subr.edu/academic/architecture/links/ARCH317.htm http://newstribune.com/stories/031700/obi_0317000014.asp http://crew_of_patches.tripod.com/sitespecific.html...
  9. phillyfrank

    Blast Pushing Large Slab Laterally

    Situation was three sides free, very flat dip on bedding, VERY crowded shot with little relief. You should see the videos! Put rock into orbit. Thanks, all.
  10. phillyfrank

    Blast Pushing Large Slab Laterally

    I am looking for any case histories of a quarry-type blast pushing un-shot rock around it by gliding on a bedding plane. I'm not talking small stuff. The incident I'm working on is a block over 100 ft on a side over ten feet thick moving several feet.
  11. phillyfrank

    Jacking this Old Leaning House

    Before going to al of this expensive and potentially damaging remedial foundation work, I would get a quote from a housemover to move the house to a nearby site where you have drilled to see if peat and silt are present. If your lot is too small, have the house moved off the lot, excavate out...
  12. phillyfrank

    Collision Avoidence: GPS for Large Mobile Mining Equipment

    Ron Graber of Cleveland Cliffs in Upper Michigan has done a lot of work with GPS on trucks for scheduling in an iron ore mine. He can be reached at rggraber@cci-cmsc-mi.com.
  13. phillyfrank

    How would you start this investigation?

    If rainfall/precipitation is an issue. The best data is from NOAA at http://www.ncdc.noaa.gov/oa/ncdc.html. Costs just $10.00 per set. Otherwise it's hearsay. Also local newspapers almost always have archives on the Internet. Make sure you get ALL of the construction, design, and...
  14. phillyfrank

    Best organizations for Expert Witnesses

    Try registering with the Defense Reasearch Institute (No, it is not a Pentagon think tank, but a defense lawyer's group for insurance and property/casaulty losses). They're at www.dri.org . It's free to register.
  15. phillyfrank

    Forensic Engineer Expert Witness 'broker'?

    There are several brokers out there and I have never used them. Make sure you have a web site connected into google and use key words descriptive of what you do. That's how a lot of our attorney work comes in, other than referral.
  16. phillyfrank

    properties of schists

    I assume you are diamond core drilling. You are probably in a weathered zone of the schist initially, which will be very soil-like. Have your driller use less water and control the feed mre carefully. Try contacting Boart Longyear and getting a triple tube core barrel. They will core through...
  17. phillyfrank

    Developing a Quarry

    We do this for a living. Key issues are zoning, public sentiment, dust, water discharge, traffic, blasting vibrations, etc., etc. Some rules of thumb: one core hole per 20 acres, 3 years, 3 lawyers, $300,000. Need to prove out at least 15 years of reserves to justify a plant. Have you done a...
  18. phillyfrank

    Caisson Drilling Rig Tipping Over

    I have since stumbled onto this site: http://www.craneaccidents.com/ for those interested in the subject. Lotsa links.
  19. phillyfrank

    Auto and Falling Object Interaction

    Rod -- I am actually working on a forensic investigation where a motorist driving by somewhere between 20 and 65 mph (accounts differ) and was hit by a several-ton weight accidentally dropped from a crane. True story. Never knew what hit him. Completely crushed car to halfway down doors. We...
  20. phillyfrank

    Auto and Falling Object Interaction

    Does anyone know of a study relating auto speed/weight to being stopped by or rolling under a vertically falling object of various weights and velocities and geometries? In other words, when a car is hit by a vertically falling object, at what point does a car get stopped dead in its tracks...

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