Experimental Investigations on the Application of Compensation Grouting in Coarse-Grained Soils-Video

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Video Summary

Martin Seiler presents experimental research on compensation grouting in coarse-grained soils, where high permeability causes grout penetration and filtration, reducing the volume available to create ground heave. A laboratory “soil filter press” was developed to assess grout suitability. Tests showed that higher soil permeability and higher water-to-solid ratios increase grout losses, while solid composition has little effect.<br /><br />Large-scale tests in a trial pit examined surface deformation and excavated fracture structures. The tests achieved 70 mm of heave, with an efficiency of 7%. Excavation revealed layered, plate-like fractures near sleeve pipes, which effectively generate heave, as well as longer, slender fractures farther away. Repeated injections of small grout volumes built up plate-like layers, while fewer injections of larger volumes tended to produce less favorable, elongated fractures.<br /><br />For practical applications, Seiler recommends using grout with a low water-to-solid ratio and carrying out numerous injections with small volumes.

Keywords

compensation grouting

coarse-grained soils

grout penetration

soil filter press

ground heave

fracture structures