Grouting and Ground Treatment: Proceedings of the Third International Conference, (ASCE)
Effect of Injection Rate on Clay-Grout behavior for Compensation Grouting
K. Soga, S.K. A. Au, M.D. Bolton
Laboratory grout injection tests were performed in clay to investigate the effect of grout injection rate on soil-grout behavior during and after injection for both ‘compaction’ type and ‘fracture’ type grouting, with particular emphasis on compensation grouting in clays. Injection of low mobility grout was stimulated by expanding a latex balloon, whereas injection of high mobility grout was simulated by injecting epoxy resin directly into clay specimens. For balloon expansion case, there was a minor effect of injection rate on pressure-injection volume and grout efficiency- time relationships. For epoxy injection case, on the other hand, fracture initiation and propagation mechanisms were affected by the magnitude of injection rate and hence the pressure-volume and grout efficiency-time relationships were injection rate dependant.
|article #1125; publication #62 (GRT-2003)|