For the construction of an underground shaft, a low strength inflammable backfill grout had to be designed to prevent direct load transfer from a squeezing rock formation, preventing it from exerting excessive pressure on the shaft liner.
Grouting techniques can also be used to prevent wind erosion and keep moisture in the soil. A four acre miniature forest was grown in the Sahara desert (Southern Tunisia) using a specially developed solution grout. It was sprayed on the sand after small Acacia Cyanaphylla trees were planted.
Hot bitumen injection, in conjunction with regular cement based suspension grouts, was employed to stop a major tailings flow, which peaked at approximately 7,000 l/sec (111,000 US GPM).
Piping below large primary clarifiers was replaced by sinking shafts in silty soils below the water table. No dewatering was allowed. A multiple pass soil grouting program created a stable, low permeability conglomerate through which the shafts were excavated.
Regular cement based suspension grout used for mine backfilling operations have low cohesion values and migrate downwards through the shotrock for the duration of a backfilling operation.
Man accessible, leaking concrete sewer joints, located below the water table beneath a roadway triggered an internal soil erosion process resulting in the formation of major sinkholes that posed danger to local traffic. An immediate remedy was necessary to restore safety to the public and provide extended life to the sewer system