Liquefaction mitigation is used to prevent the phenomenon in which loose, saturated, cohesionless soils lose their strength because of ground motion from earthquakes.
- Avoid bearing capacity failure from liquefaction
- Control seismic settlement
- Stop lateral spreading and reduction in deep foundation support
Seismic forces can stimulate layers of saturated granular soil, contracting the soils’ loose structure which reduces the soils’ strength and produces additional pore water pressure. This phenomenon causes the soil to act as a viscous liquid.
Liquefaction can affect shallow foundations by reducing foundation support through the loss of bearing capacity and causing excessive settlement, lateral spreading, and flow failures. Deep foundations are affected by the reduction in lateral capacity and added stress on the piles from lateral spreading or flow failures.
When a building is planned on the presence of liquefiable soils, it does not mean the project needs to be abandoned or deep foundations must be used. Our geotechnical techniques can provide in situ remediation for loose, cohesionless soils. Specifically, earthquake drains provide a drainage path for pore pressure in soils before it reaches critical levels.