The Big Dig Ceiling Collapse: An Epoxy that took down a Tunnel Ceiling

On the 10 of July 2006 the ceiling of the big dig tunnel collapses. This was 9 years after the fort point channel opened to traffic. So what was the cause of this collapse of the ceiling of the tunnel on the I90 in Boston?

I will cover the history around the constitution of the big dig tunnel and what the NTSB uncovered in their investigation into this tragedy. You will find out the causes behind why the ceiling of the fort point tunnel collapsed, what decision led up to the tragedy, and was there warning signs prior to the collapse of the ceiling on the big dig tunnel.

It is important that all engineering understand both the structural mechanics behind the failure, but also understand the decision the led up to the tragedy and how human physiology can play a role in an engineering disaster.

The true cause of the big dig ceiling collapse in epoxy with the same name that had two versions, a fast set and a standard set. These epoxies produced by Power Fasteners had performed similar in a short term loading situation but had drastically different properties under a sustained load. One of these epoxies suffers from an issue known as Epoxy Creep, which means over time under a sustained load the epoxy will stretch and weaken to an eventual point of failure.

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Chapter
00:00 Intro
00:50 Main Structural Elements in a Tunnel
01:43 Type of Post fixed anchors
03:24 Structural issues during construction
05:39 The Investigation
07:05 The Remaining Ceiling
07:27 Was installation at fault
08:27 What is Epoxy Creep
10:17 What did Power Fasteners Know
11:10 NTSB's Conclusions
11:27 Additional findings

Видео The Big Dig Ceiling Collapse: An Epoxy that took down a Tunnel Ceiling канала Brendan Hasty