Void Filling

Void space can develop underneath a structure or within a soil matrix.   For example, a water leak can quickly erode soil from underneath a slab leaving void space below and subsequently a high potential for rapid settlement.   In some cases, water can erode soil from behind tunnel walls, creating void space between the tunnel and surrounding earth.     When void space develops, the earth and structure lose their “positive contact” and unwanted movement/subsidence can occur.

Void filling is a grouting process for eliminating these empty spaces and restoring the integrity of the structure and/or soil matrix.    The process is generally done by strategically injecting a grout into the void space, eliminating as much water and air from the soil matrix as possible.

Polymer grouts are an ideal material to fill void space, especially in “hard to reach” areas.    The liquid polymer can be injected through small holes/injection ports.   This material will then slowly expand, following the path of least resistance.   Expanding polymers can penetrate up to 1/16″ void spaces  and have in-situ densities ranging from 2 pcf to 6 pcf.    Expanding polymers can reach 90% strength in 15 minutes.

Engineered Foundation Technologies (“EFT”) Void Filling Projects include:

• Hoosac Tunnel, Western Portal – North Adams, MA
• The Shire – Woodstock, VT
• True By Hilton Hotel – Manchester, NH

Contact us to see how we can help with your project.

Serving New England:  Massachusetts – New Hampshire – Maine – Rhode Island – Vermont  – Connecticut