Miami-Dade County, Florida, 2011 – 2013 The Miami-Dade County Water and Sewer Department required an aging sewage line under the Government Cut, a channel between
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.
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.
A double row grout curtain was constructed around the perimeter of 2 large diameter (100 plus ft) caisson shafts using acrylamide and cement based suspension grout to stabilize and control the water inflow prior to sinking the shaft through the soil and rock formations.