Liquefaction Foundation Mats

Buried utilities such as sewage and water pipes should have ductile connections to the structure to accommodate the large movements and settlements that can occur due to liquefaction.

Liquefaction foundation mats.

Use of robust mats or a stiff grid of intersecting ground beams instead of stand alone footings. Piles driven through a weak potentially soil layer to a stronger layer not only have to carry vertical loads form the superstructure but must also be able to resist horizontal loads and bending moments induced by lateral movements if the weak layer liquefies. Site liquefaction and liquefaction induced lateral spreading in the feb. Stiff foundation mats are a good method for mitigating liquefaction for shallow foundations.

Soil liquefaction has caused major damage to superstructures resting on shallow foundations during past earthquakes. I a benchmark test without a liquefaction countermeasure ii foundation densiflcation below the embankment toe and iii use of a sheet pile containment. A stiff foundation mat below is a good type of shallow foundation which can transfer loads from locally liquefied zones to adjacent stronger ground. The experimental series included.

Complete analysis design of a mat or raft foundation analyses uniform thickness finite mat or raft foundation with free ends and supported by a beam on elastic foundation. Soil stiffness is greatly decreased as a result of excess pore water pressure epwp generation and the consequent effective stress reduction. Deep foundation aspect liquefaction can cause large lateral loads on pile foundations. Spreadsheets are hard.

Making above ground structural elements or connections between structures flexible and ductile to cope with total and differential settlements or lateral spread. Shallow foundation detailing mat foundation detailing reinforcing each way top and bottom detail according to aci 318 14 section 18 6 3 1 minimum longitudinal reinforcing only or design to accommodate expected differential settlements elastic design consistent with small permitted differential settlements.