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Combined Use of Grouting and Soil Stabilization in Sinkhole Remediation
Changing hydro-geological conditions have induced the formation of numerous dolines in southwest Florida. This has a direct effect on the erosion and subsidence of the overburden, composed mainly of a thin stratum of clay and sand overlying the limestone. As a result, numerous residential structures are damaged by sinkholes. Cover collapse occurs less frequently but damage due to cover subsidence is more common. The most common remedial measures advocated are pressure grouting, underpinning or both. Pressure grouting using a high slump grout has not been effective controlling the settlement and under-pinning systems have failed as ground subsidence continued. To restore a sinkhole-damaged structure to a livable and marketable condition the author recommends limited mobility grouting instead of pressure grouting. The overburden must then be stabilized by a positive displacement method such as soil mixing or stabilized soil columns. This method of remediation has been recommended on numerous cases by the author. This paper presents the concept using a case study show that the two components of the proposed method of stabilization—limited mobility grouting and soil improvement—could be successfully used. An alternative method using a post-tensioned mat is also briefly discussed.
Combined Use of Grouting and Soil Stabilization in Sinkhole Remediation
Changing hydro-geological conditions have induced the formation of numerous dolines in southwest Florida. This has a direct effect on the erosion and subsidence of the overburden, composed mainly of a thin stratum of clay and sand overlying the limestone. As a result, numerous residential structures are damaged by sinkholes. Cover collapse occurs less frequently but damage due to cover subsidence is more common. The most common remedial measures advocated are pressure grouting, underpinning or both. Pressure grouting using a high slump grout has not been effective controlling the settlement and under-pinning systems have failed as ground subsidence continued. To restore a sinkhole-damaged structure to a livable and marketable condition the author recommends limited mobility grouting instead of pressure grouting. The overburden must then be stabilized by a positive displacement method such as soil mixing or stabilized soil columns. This method of remediation has been recommended on numerous cases by the author. This paper presents the concept using a case study show that the two components of the proposed method of stabilization—limited mobility grouting and soil improvement—could be successfully used. An alternative method using a post-tensioned mat is also briefly discussed.
Combined Use of Grouting and Soil Stabilization in Sinkhole Remediation
Kannan, Ramanuja Chari (author)
Ninth Multidisciplinary Conference on Sinkholes and the Engineering and Environmental Impacts of Karst ; 2003 ; Huntsville, Alabama, United States
2003-09-05
Conference paper
Electronic Resource
English
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