There are two main ways to reduce the effects of liquefaction – by improving the ground condition or by specific foundation design.

 

There are various methods available to reduce the susceptibility of a soil to liquefaction.  These methods increase the density of the soil thereby increasing the resistance of the soil to liquefaction.  Most of the methods are expensive and would be uneconomic for residential structures.  Lower cost compaction methods such as repetitive dropping of a heavy weight or using a heavy roller may be economic for residential developments.

 

Specific foundation designs reduce the likelihood of damage to the foundation and deformation of the structure.  Stronger foundations, deep piles and piling to non-liquefiable soil layers are the more common methods used to reduce the effect of liquefaction on structures.

For further assistance please contact Customer Service on 03 353 9007 or toll free on 0800 324 636.
You can also visit our website www.ecan.govt.nz