Related Links: Highway Administrator's Frozen Soil and Ground Settlement Update to Board of Directors, Aug. 10, 2011 Big Dig's Technical Maual Section on on Jacked-box Tunneling and Ground Freezing Boston’s Big Dig tunnel has one more problem. Thawing from ground-freezing technology used to excavate the I-90 connector system 11 years ago has apparently caused a large swath of soil to settle. Engineers fear that a deep water-filled void may be lurking beneath.The area of concern beneath the I-90 tunnel base slab measures 190 ft long by 60 ft wide, says Frank DePaola, appointed Massachusetts Dept. of Transportation’s new highway administrator
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