Soil Liquefaction Potential at Single Family Residence Site 1

[digrazi]

After completing the timber design of a new single family residence, I was preparing to design the foundation system. I was originally expecting a standard 97 UBC approach spread footing system. During my research I found out that the site is in an area of "moderate liquefaction" potential. I have never dealt with this situation before. Can a geotech provide adequate guidence and recommendations?

 

[ngneer]

investigate other structures in the vicinity to determine if similar situation exists. most likely soil exploration is required to characterize strata, test soil behaviour, and recommend foundation system.

 

[ctmtwilliams]

You should have a geotech firm evaluate the site. The report they provide should include mitigation measures/design specs if nessessary.

 

[Richmanengineering]

Richman Engineer(Soils Reports)

Usually if liquefaction potential may exist the governing
body will require that you you get a Soils Engineer to investigate this. Liquefaction potential occurs
in most commonly in loose sandy soils, seismic active and high ground water table. Deepen borings are usually required to determine the soil characteristics and the
ground water table.

 

[BigH]

Agree with Richmanengineering - your site is only liquefiable if the soils on the site are liquifiable. General maps are general and may "skip" certain areas where the soils are not susceptable to liquefaction. A geotechnical engineer should be able to tell you pretty readily (if you have the investigation - or did you not do one?) if you have a problem.

 

[cvg]

the level of the water table is equally important as the type of soil.

liquifaction cannot occur without high groundwater and the corresponding high pore water pressures.