A trademark of The Pressure Grout Company, lense grouting is another specialized form of grouting. It involves the injection of cement slurry, about the consistency of thick cream, that hydraulically fractures the soil and produces near horizontal grout ‘lenses,’ which serve as water barriers and provide in-situ soil reinforcement.
A FLEXIBLE SOLUTION
An innovative ground improvement method, Lense Grouting is a specialized technique for the injection of a cement grout to hydraulically fracture the soil and produce multiple, water-resistant horizontal grout layers. Each layer contributes to the reduction of moisture related shrinking or swelling of clay soils, and provides in-situ reinforcement of the soil.
Each lense is designed to be about 10 feet in diameter and 1/8-inch thick. The formation of these lenses has been demonstrated by extensive testing in the field, and is one of the Pressure Grout Company’s specialized techniques.
Lense grouting is one of the most effective procedures for dealing with expansive clay soils, which are known for shrinking or swelling associated with changes in moisture content. Seasonal or other differential changes in water content can cause heaving or settlement in these soils, and the structure built upon them. Through the installation of water-resistant moisture barriers or ‘lenses’, the Pressure Grout Company can reduce or eliminate these effects.
THE PERFORMANCE COMPANY
The Pressure Grout Company developed Lense Grouting. In theory as in practice, at a given pressure an appropriate grout mixture with the appropriate viscosity will fracture a soil mass in its weakest plane or along bedding planes. Based on this theory, and utilizing its extensive years of grouting expertise, the Pressure Grout Company experimented with the technique, and developed practical applications for its use.
Because of the complexity of soil behavior, specialized knowledge is required to correctly carry out Lense Grouting. Our systems inject grout, designed to intrude, penetrate, or form lenses in the problem areas.
During Lense Grouting, the actual characteristics of the soil mass are modified as the grout hardens.
The primary applications of Lense Grouting include:
- Soil stabilization and strengthening, primarily for excavation support or in close proximity to retaining walls
- To increase friction and end load bearing of piles and piers
- Increasing stand-up time to facilitate soft ground tunneling
- Reducing and eliminating ‘creep’ of soil by reinforcing loose formations and expansive soils
- Exclusion or in situ containment of contamination on environmental projects
- Closure of windows or gaps in “bathtub” excavations
- Sealing off and stabilizing high permeability backfill, as in trenches
Slideshow Of Lense Grouting Photo Images