The Jefferson Memorial itself is supported on a network of 600+ concrete piles and drilled shafts that penetrate through soft Patomac River sediments and dredged material into bedrock between 80 and 138-ft below ground. However, the seawall is supported on timber pilings that are estimated to be 65 to 75-ft long, stopping short of the bedrock. The wall has been settling below the level of the adjacent plaza since about 2006 as reported by GeoPrac back in 2007. At that time Schnabel was preparing a report for the National Park Service, but I never heard anything else about it. General contractor Clark Construction Company has been working on a $12.4M repair project that includes constructing a temporary cofferdam, deconstructing the existing seawall while salvaging the historic stone facing, installing 4-ft drilled shafts into bedrock and battered concrete-filled pipe piles to support a new seawall. The project is expected to be completed in the spring of 2011. [Source: Washington Post via ASCE SmartBrief. Image: The Washington Post]
Related Articles
German town sinking after drilling operations
The historic town of Staufen in southwestern Germany on the western edge of the Black Forest is experiencing some rather unexpected downward movement these days. Several buildings, some of them historic, are experiencing cracking and distress and are still sinking at a rate of approximately 1mm per week. Investigations are underway, but everything seems to point towards drilling operations for geothermal energy which were conducted last fall. [Editor] More after the break…[/Editor]
Seattle tunnel will go under 158 buildings
The tunnel replacing the Alaskan Way Viaduct (SR-99) will pass beneath 158 existing structures requiring an extensive program of vibration and settlement monitoring as well as some remediation. Of the 158 buildings, WSDOT identified 20 […]
New Tapan Zee Bridge Cofferdams designed with DeepEx software
February 13, 2015
rockman
Project Related
Comments Off on New Tapan Zee Bridge Cofferdams designed with DeepEx software