Liquefaction Foundation Mats

Making above ground structural elements or connections between structures flexible and ductile to cope with total and differential settlements or lateral spread.

Liquefaction foundation mats. Soil stiffness is greatly decreased as a result of excess pore water pressure epwp generation and the consequent effective stress reduction. 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. 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. I a benchmark test without a liquefaction countermeasure ii foundation densiflcation below the embankment toe and iii use of a sheet pile containment.

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. Download free demo updated february 18 2019 soilstructure mat or raft foundation simplifies the calculation of combined footings and mats or rafts. Site liquefaction and liquefaction induced lateral spreading in the feb. Soil liquefaction has caused major damage to superstructures resting on shallow foundations during past earthquakes.

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. Spreadsheets are hard. A stiff foundation mat below is a good type of shallow foundation which can transfer loads from locally liquefied zones to adjacent stronger ground. Stiff foundation mats are a good method for mitigating liquefaction for shallow foundations.

22 2011 christchurch mw6 3 earthquake especially caused severe damage to about 15000 residential buildings 1000. A stiff foundation mat can transfer loads from areas of weakness to areas of strength in the soil thus.