How to Grout to Prevent Liquefaction

Construction projects run into dangers of building collapse due to the type of soil conditions and earthquakes. Ground that lacks natural cohesiveness, such as sands, silts, gravel and clays, go through a process of liquefaction, where if the ground soaks in too much water, it can lose cohesiveness and break away. To fix this issue, contractors perform grouting techniques to compact the soil texture by pumping grouting materials into the ground's problem areas.

Truck with pneumatic auger
Pressure pump truck
76 mm diameter grout pipe
Grout mix (water, cement, fly ash and silty sand)

Instructions

- 1
  Drive the truck with the pneumatic auger to the spot where the first drill hole will be. Connect the drill bit pipe to auger. Drill at an angle into the area where you will pump the grout at a depth of 11.5 feet or more.
- 2
  Pull out the drill bit. Remove it from the auger and attach a 76mm diameter grout pipe. Place the pipe into the drill hole.
- 3
  Remove the auger from the grout pipe. Move the pressure pump truck near the grout pipe. Install the pumping line onto the grout pipe. Pump the grout mix into the pipe at a flow rate of 11 inches per minute.
- 4
  Lift the pipe 1 foot when injection pressure reaches either 2 MPa (megapascals) or when the ground slightly heaves. Continue pumping until the grout injection is complete. Perform additional injections in a 12-foot grid pattern.

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