Specialty Geotechnical Contractor DBM was excavating a drilled shaft for the I-5 interchange in Ridgefield, Washington when they dug up something unusual at a depth of 30-ft. At first the WSDOT inspector thought it looked like wood, but then called in a WSDOT archaeologist who took the fragments to University of Washington’s Burke Museum of Natural History and Culture. The tusk is believed to belong to a Columbian Mammoth and date to approximately 13,000 to 15,000 years ago. Story and image from The Columbian.
Geovert, a specialty design-build geotechnical contractor in New Zealand and Australia has released a video showing the construction of a challenging rockfall protection project. From their YouTube description:
Stockton Coal Mine is situated on the rugged west coast of New Zealand’s South Island, near Westport. Geovert, a design-build contractor specializing in difficult access rockfall mitigation projects, were retained to provide a turnkey solution combining slope protection and stabilisation measures, to manage the rockfall hazard and protect the surrounding environment with a world class design build rockfall protection solution. The barrier was 1.7 kilometres long and follows a ridgeline escarpment, making this the longest rockfall protection barrier in the southern hemisphere. This was one of the largest and most challenging rockfall construction projects completed to date anywhere in the world.
Click through to see the video.
ADSC published a summary of some research being conducted by the University of Texas, Arlington (UTA) through funding by TxDOT. The research involves the lateral load testing of drilled shafts that are used for cable […]
The Ancient Egyptians are still marveled at today for some of their enduring hard-rock creations. Of course everyone thinks of the Sphinx and the Great Pyramids, but perhaps just as impressive if not more impressive were the gigantic obelisks that were quarried and somehow transported into place. There is work underway to preserve a rare archaeological site, a granite quarry with a large unfinished obelisk near Aswan.
Archaeological evidence combined with some shallow seismic refraction surveys and bore holes confirm the finding of a canal believed to have been used to transport these obelisks to the Nile River during flooding. However, dewatering will be needed to excavate these canals to verify these claims. Another problem is the salt deposits that are slowly destroying the quarry. National Driller Magazine is the location of this interesting article. Link after the break. (Photo by Son of Groucho)