abredeensettlementinvestigation

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Foun dat io n Rep ai r & Wat er p r oof ing

garage and the underground Storm Water Detention Vault. All of the video inspection data is included later in this report.

As you will see in the Geotechnical Report from Chattahoochee Consulting Group. On 11/4/16 the efforts to use “Hand Augers” to collect samples were not completely successful due to large and numerous rock fragments in the areas being tested. So, we returned on 11/11/16 with Drilling Equipment capable of advancing drill augers to the required depths. The preliminary findings if this investigation indicate that some of the settlement conditions are the result of as much as 25’ of marginally placed fill soil. This fill soil is consolidating into small voids within itself and causing surface structures (walls, pavements, etc.) constructed at the surface to settle. Based on our findings, it appears that the settlement conditions of the surface structures can be stabilized against future settlements using a combination of Foundation Underpinning and Pressure (Injection) Grouting for Soil Stabilization. We recommend Underpinning the Heavier Loaded Structures with Foundation Piers (Piles) and Stabilizing the fill soil within the whole affected area with Injection Grouting. I am attaching a Sectional Detail of both of these services along with some photographs of the resulting signs of significant settlement of the surface structures. Foundation Underpinning is a process which extends the load of a structure deeper into the subgrade to Bedrock or a Dense Soil Strata capable of supporting the load requirements of said structure(s). This is performed by exposing the foundation of a structure, preparing it, mounting large steel brackets to the foundation and driving steel piers into the ground until they reach material that can support the loads above. The Pier is then mechanically attached to the foundation bracket and the structure becomes secure and stable.