Commentary

The cost of deep dynamic compaction (DDC) is typically captured in two bid items:

• Design (for performance-based DDC project)
• Mobilization, normally lump sum
• Dynamic compaction, normally on a unit rate, either square feet or square yards
• Standby Rates

Other costs associated with DDC which may be measured and paid for separately include:

Technology Fact Sheet Deep Dynamic Compaction

<p><p><strong>Reference(s):</strong></p><p><em>Dumas and Beaton (1992)</em><em>Miller et al. (2004)</em><em>Schaefer et al. (1997)</em></p><p><strong>Method Summary<br></strong>Dilatometer tests can be useful when the objective of DDC is to increase bearing capacity or reduce settlement, since they provide direct correlations to the applicable soil parameters.

Project Summary/Scope:

In 2021, construction began on an undeveloped parcel of land in Olyphant, Pennsylvania that was previously used for strip mining purposes associated with the coal in

Project Summary/Scope:

As a result of changes to the New York City Building Code (NYCBC) in 1996, seismic and liquefaction studies became more common in an area that previously had not been considered a high

<p><p><strong>Reference(s):</strong></p><p><em>Han (1998)</em><em>Lukas (1986)</em><em>Lukas (1995)</em><em>Mitchell (1981b)</em><em>Schaefer et al.

<p><p><strong>Reference(s):</strong></p><p><em>Elias et al. (2006a)</em><em>Lukas (1986)</em><em>Lukas (1995)</em></p><p><strong>Method Summary<br></strong>Quick response piezometers should be used to accurately capture the large increases in porewater pressure during deep dynamic compaction.

<p><p><strong>Reference(s):</strong></p><p><em>Dumas and Beaton (1992)<br></em><em>Elias et al. (2006a)<br></em><em>Lukas (1986)<br></em><em>Lukas (1995)<br></em><em>Mitchell (1981b)<br></em><em>Schaefer et al. (1997)</em></p><p><strong>Method Summary<br></strong>Pressuremeter tests can be performed both before and after compaction to determine relative changes in soil properties.

Project Summary/Scope:

The  Prudential  Center  site encompasses an entire city block that had a varied history of uses ranging from a cemetery in the lat

<p><p><strong>Reference(s):</strong></p><p><em>Dumas and Beaton (1992)</em><em>Elias et al. (2006a)</em><em>Lukas (1986)</em><em>Lukas (1995) </em><em>Mitchell (1981b)</em></p><p><strong>Method Summary<br></strong>Settlement measurements should be performed in a grid pattern over the area being compacted both during and after the compaction program.

<p><p><strong>Reference(s):<br></strong><em>Dumas and Beaton (1992)</em><em>Elias et al. (2006a)</em><em>Han (1998)</em><em>Kumar (2001)</em><em>Lukas (1986)</em><em>Lukas (1995) </em><em>Mackiewicz and Camp (2007)</em><em>Mitchell (1981b)</em><em>Schaefer et al.

Project Summary/Scope:

The Tempe Marketplace property was historically used as a Municipal Solid Waste (MSW) and construction debris landfill for decades prior to the late 1990s.

<p><p><strong>Reference(s):</strong></p><p><em>Dumas and Beaton (1992)</em><em>Elias et al. (2006a)</em><em>Lukas (1986)</em><em>Lukas (1995)</em></p><p><strong>Method Summary<br></strong>Vibration monitoring should be performed at any nearby structures or facilities that could be damaged. These include buildings and other engineered structures such as dams, retaining walls, buried conduits, etc.