Geo-Jet

The Process

The Geo-Jet process combines mechanical cutting, jet mixing, high-volume cementing and computer-control technology to form uniform quality, soil-cement elements.  A soil processor is equipped with specially designed cutting blades and multiple jetting nozzles which jet mix at pressures  up to 5000 psi.

Geo-Jet equipment includes the soil processor, hollow kelly, a mobile crane with fixed leads and rotary drill system, bulk material storage units, slurry mixing plant and high pressure slurry pump.  A micro-processor computer monitors and controls the entire process to achieve predetermined density and strength properties of the soil-cement.

Geo-Jet elements are created in a downward pass of the soil processor penetrating at 6 to 40 feet per minute.  Upon reaching the design depth, the kelly and processor are removed from the hole.  Element sizes range to 48 inches in diameter and to depths of 150 feet.  Steel pipe, HP or wide-flange inserts are installed into the fresh soil-cement to meet structural design requirements as needed.

Quality Control

Computer control of the Geo-Jet system assures exceedingly high quality soil-cement. The computer analyzes the rate of soil processor rotation and penetration, slurry pressure, torque, crowd force, and soil-cement volume and density as a function of depth.  The system also reacts to changing parameters and adjusts them automatically to maintain specified soil-cement properties, even in varying subsurface soil or soft rock conditions.

The process is so rapid that computer control of the equipment during element formation is required.  The rotary drilling system stops automatically if soil-cement parameters exceed established limits.  A computer generated plot and detailed report provide a permanent record of the each installation for quality assurance.

Applications

The Geo-Jet method is applicable to a wide range of subsurface soil, soft rock and groundwater conditions. Major project applications include construction of:

1 Permanent excavation support walls
2 Temporary shoring systems
3 Deep foundation support for all types of structures
4 Groundwater control for levees or excavations
5 Containment systems for contaminated sites
6 Slope stabilization and landslide repair
7 Earthquake lateral spreading reduction

Other applications include subgrade strengthening, seismic wave interceptor blocks, gravity walls, and sealing of joints of steel sheet piles.  Mix designs for the soil-cement vary to meet strength, permeability, set time or other local requirements.  Adjacent elements are overlapped to form walls, cells or many other configurations.

Advantages

 The rapid cutting, thorough jet mixing, high level of computer control and  self-contained equipment contribute to the benefits of quality, speed and cost-effectiveness of the system.  Geo-Jet is a fast and reliable alternative to driven and auger cast piles, drilled shafts, sheet pile walls and specialty construction methods such as jet grouting, deep soil mixing, and stone columns.

Key advantages include:

1  Quiet, vibration free construction
2   High quality soil cement from computer control system
3   Elimination of the need for casing in wet, caving soils
4   Elimination of costly steel sheeting or wood lagging
5   Thorough mixing of soil-cement without gaps and holes as in auger mixing
6   Greater settlement reduction in soft soils than any stone column system
7   Highest productivity of any currently available system
8   Lowest cost per kip capacity of all systems in most ground conditions

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Geo-Jet is a registered trademark owned by Aerial Industrial, inc.
Copyright 1999 - 2007 by Geo-Jet