Monitoring and Modeling Grout Efficiency of Lifting Structure in Soft Clay
Publication: International Journal of Geomechanics
Volume 10, Issue 6
Abstract
An inclined eight-story reinforced concrete building on a thick soft clay deposit was leveled by compensation grouting with short gel time grout injected through sleeved pipes. The monitoring system is used to record the injected grout volume, the mat foundation’s heaved volume after grouting, and the mat foundation’s settled volume during pore pressure dissipation. The grouting efficiencies improved from negative value to less than one, and the stress histories of clay soils changed from normally consolidated to overconsolidated states. A final compensation efficiency of 9.78% was achieved and the building was successfully leveled. A series of numerical simulations were conducted to assess the capability of compensation grouting modeling. The numerical simulation results indicate that the consolidation behavior and the stress history of clayey foundation soils can be modeled reasonably well. However, the computed final grout efficiency is larger than that from the monitoring data because the simulation of fracture grouting by volumetric strain input is more like compaction grouting mode rather than fracture grouting mode, and this induces lesser excess pore pressure, lesser settlement and higher grout efficiency. These findings are also confirmed from other researchers’ laboratory and field testing results.
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Acknowledgments
The writers wish to acknowledge former graduate student Mr. T. Chang for the field investigation and the data collection that made this research possible, the writers are also grateful to the anonymous reviewers, who have strengthened the technical soundness of this work.
References
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Information & Authors
Information
Published In
International Journal of Geomechanics
Volume 10 • Issue 6 • December 2010
Pages: 223 - 229
Copyright
© 2010 ASCE.
History
Received: Jul 14, 2009
Accepted: May 2, 2010
Published online: Jun 24, 2010
Published in print: Dec 2010
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