A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Grouting Roadway Sinkholes
Many roadways within Carroll County, Maryland lie within the Wakefield Valley, a faulted syncline encompassing dissolutioned marbles. Sinkhole formation throughout the region is common. Because of the loss of a life from a sinkhole in a Carroll County highway several years ago, the County instituted a periodic inspection of all County roads in karstic areas. As part of this periodic inspection program, two possible areas of concern were noted, one on Medford Road and one on Nicodemus Road. Both areas potentially overlie dissolutioned Wakefield Marble. To assess these areas, test borings were drilled. The borings encountered Wakefield Marble at depths on the order of 40 feet below grade in both areas. Some areas of soft soils were also noted in several of the borings. After a thorough evaluation by County representatives, a program of subsurface grouting was selected to remediate the two sites. The planned exploration/grouting program included: slurry grouting (a cement, soil, water, and sand mix) with additives as necessary to seal rock fractures, soil voids and rock cavities; and compaction grouting of any areas of very soft soils encountered during remediation. Contracting was a problem because of the large amount of karst grouting activity in Maryland at that time. After two rounds of bidding, a contractor was selected and the work initiated. Some 95% of the holes were grouted using a high-mobility transit mix grout. The remaining holes used a similar grout mix, but with cased probe holes and moderate injection pressures. The job was successfully completed under budget.
Grouting Roadway Sinkholes
Many roadways within Carroll County, Maryland lie within the Wakefield Valley, a faulted syncline encompassing dissolutioned marbles. Sinkhole formation throughout the region is common. Because of the loss of a life from a sinkhole in a Carroll County highway several years ago, the County instituted a periodic inspection of all County roads in karstic areas. As part of this periodic inspection program, two possible areas of concern were noted, one on Medford Road and one on Nicodemus Road. Both areas potentially overlie dissolutioned Wakefield Marble. To assess these areas, test borings were drilled. The borings encountered Wakefield Marble at depths on the order of 40 feet below grade in both areas. Some areas of soft soils were also noted in several of the borings. After a thorough evaluation by County representatives, a program of subsurface grouting was selected to remediate the two sites. The planned exploration/grouting program included: slurry grouting (a cement, soil, water, and sand mix) with additives as necessary to seal rock fractures, soil voids and rock cavities; and compaction grouting of any areas of very soft soils encountered during remediation. Contracting was a problem because of the large amount of karst grouting activity in Maryland at that time. After two rounds of bidding, a contractor was selected and the work initiated. Some 95% of the holes were grouted using a high-mobility transit mix grout. The remaining holes used a similar grout mix, but with cased probe holes and moderate injection pressures. The job was successfully completed under budget.
Grouting Roadway Sinkholes
Watson, Benton H. (author) / Devilbiss, Tom (author) / Fischer, Joseph A. (author) / Fischer, Joseph J. (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
| British Library Conference Proceedings | 2003
HVSR Measurements to Investigate Sinkholes and Treatment Efforts along a Roadway
| British Library Conference Proceedings | 2023
Online Contents | 2014