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Evaluation of Soil-Cement-Bentonite Wall Performance - Effects of Backfill Shrinkage
Results of a comprehensive evaluation of construction and performance of an in-situ mixed soil-cement-bentonite (SCB) wall constructed at a Florida site are presented and discussed. Cracking of boreholes during verification drilling resulted in in-hole permeability test results higher than specified limits in contract documents. The evaluation indicated that fluid pressures associated with certain verification drilling techniques (e.g., coring) may result in longitudinal stresses in the SCB wall of sufficient magnitude to exceed the tensile strength of the wall backfill resulting in cracking. Also, transverse cracking away from boreholes was observed many months after construction within the top portion of the wall. The investigation of internal stresses in the wall indicated that drying shrinkage which occurred above a moisture zone together with thermal shrinkage had the capacity to induce tension stresses which exceeded the tensile strength of the wall backfill, and caused the observed transverse cracking at the top portion of the wall. The study found that cracks did not affect the overall performance of the SCB wall.
Evaluation of Soil-Cement-Bentonite Wall Performance - Effects of Backfill Shrinkage
Results of a comprehensive evaluation of construction and performance of an in-situ mixed soil-cement-bentonite (SCB) wall constructed at a Florida site are presented and discussed. Cracking of boreholes during verification drilling resulted in in-hole permeability test results higher than specified limits in contract documents. The evaluation indicated that fluid pressures associated with certain verification drilling techniques (e.g., coring) may result in longitudinal stresses in the SCB wall of sufficient magnitude to exceed the tensile strength of the wall backfill resulting in cracking. Also, transverse cracking away from boreholes was observed many months after construction within the top portion of the wall. The investigation of internal stresses in the wall indicated that drying shrinkage which occurred above a moisture zone together with thermal shrinkage had the capacity to induce tension stresses which exceeded the tensile strength of the wall backfill, and caused the observed transverse cracking at the top portion of the wall. The study found that cracks did not affect the overall performance of the SCB wall.
Evaluation of Soil-Cement-Bentonite Wall Performance - Effects of Backfill Shrinkage
Cermak, Jan (author) / Evans, Jeffrey (author) / Tamaro, George J. (author)
Proceedings of the Fourth International Conference on Grouting and Deep Mixing ; 2012 ; New Orleans, Louisiana, United States
Grouting and Deep Mixing 2012 ; 502-511
2012-08-17
Conference paper
Electronic Resource
English
Grouting , Highways and roads , Soil mixing , Chemical grouting , Soil structures , Anchors , Cement , Cutoffs , Shrinkage , Piles , Mixing , Foundations , Walls , Hydraulic structures
Evaluation of Soil-Cement-Bentonite Wall Performance - Effects of Backfill Shrinkage
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