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Foundation underpinning process and relationship with groundwater in west-central Florida

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Authors:Said, Ahmed
Author Affiliations:Primary:
Sinkhole Geotech, United States
Volume Title:Electronic Journal of Geotechnical Engineering
Source:The Electronic Journal of Geotechnical Engineering, 19( BUNDLE Z3), p.10399-10408. Publisher: Mete Oner, Stillwater, OK, United States. ISSN: 1089-3032
Publication Date:2014
Note:In English. 10 refs.; illus., incl. sketch maps
Summary:A map of refusal depth for underpinning in West-Central Florida was developed. The purpose of underpinning is to provide support to distressed structures and overcome excessive settlement due to numerous factors, including sinkhole activity. Underpinning expands the existing foundation beneath an existing structure. Structures that have been affected by sinkhole activity require remediation and underpinning is the ideal solution if the foundation has poor subsurface conditions. Depth and pressure are the factors, which control installation of underpinning piers. Soil profiles at the site determine the depth of the pier. The maximum depth, or refusal depth, is reached when the pier system refuses to be pushed any lower without lifting the structure. Calculating underpinning depth is crucial in determining which underpinning method is suitable for the structure, as well as estimating the required construction materials. The results of this paper show that the refusal depth increases in areas where water in the Upper Floridian aquifer is low and this may be attributed to the absence of support from groundwater. The results will be useful in predicting installation depths, especially in areas where a few underpinning projects have been taken place.
Subjects:Engineering properties; Foundations; Geologic hazards; Ground water; Karst hydrology; Land subsidence; Loading; Natural hazards; Penetration tests; Potentiometric surface; Prediction; Recharge; Remediation; Settlement; Sinkholes; Soil profiles; Solution features; Strength; Weathered materials; Citrus County Florida; Florida; Floridan Aquifer; Hernando County Florida; Levy County Florida; Orange County Florida; Pasco County Florida; Polk County Florida; United States; West-central Florida
Coordinates:N273500 N293500 W0811000 W0831300
Record ID:849860-1
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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