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Andrew Barr Profile picture
Andrew Barr
@andrew_barr
Research Fellow @sheffielduni / @sheffieldblast • 💥 Explosions , 〰️ stress waves, and 🪨 geotechnics • 🚴 Active travel fan • 🥔 Made in Northern Ireland
Jun 28, 2023 • 21 tweets • 9 min read
THE KAKHOVKA DAM 🇺🇦
Part 3: Causes for failure

Lower water levels and recent images and drone footage make it possible to assess the most likely failure mechanisms of the #KakhovkaDam in several locations. Here is why I think internal explosion(s) remain the most likely cause.🧵 If you haven't already, be sure to read Parts 1 and 2 of this thread for background on the construction and operation of the barrage and hydroelectric power plant, and earlier damage assessment:
Jun 14, 2023 • 56 tweets • 17 min read
THE KAKHOVKA DAM🇺🇦

As more information becomes available on the #KakhovkaDam collapse, it will be important to understand how the structure worked.🏗️

In this thread I'll explore the barrage and power plant through section drawings, before moving on to a discussion of damage. 🧵 The "dam" is really several structures working together to create the Kakhovka Reservoir: a long earth-filled embankment dam, a central concrete barrage to control water flow, and a hydroelectric plant for power generation.
Feb 17, 2023 • 17 tweets • 7 min read
How do you dispose of a huge WW2 bomb in the middle of a town while keeping everyone safe? Sand!
The discovery of a 250kg bomb in #GreatYarmouth last week provided a great example of how the Army responds to these threats. 🧵 Plan and section drawings of the sand structure built around Last Tuesday a WW2 bomb was discovered during dredging work in the River Yare. It's common to unearth old bombs during construction work in the UK, and they still pose a real danger 80 years later.
This appears to have been a German SC 250. EOD specialists examine the bomb by the riverside. Photo by Example of an SC 250 bomb. Note that the tail fin was not pr
Oct 9, 2022 • 8 tweets • 3 min read
A few people have asked why this satellite image of the #CrimeanBridge shows so many damaged sections from a single explosion, so here's a brief Bridges 101 on the likely failure mechanism. 🧵 Diagram of the Crimean Brid... This section of the bridge is a simple "beam bridge" design. The road deck in each direction is supported on large steel girders, which span between regularly spaced concrete piers. The load on the piers is then transmitted deep into the ground by lots of concrete piles.