How do you protect buildings from liquefaction?
Retrofitting a house to withstand the effects of liquefaction typically involves improving the foundation, and the density of the soil around and under the house, achieved through soil excavation and compacting.
What can be done to prevent damage to buildings in areas prone to liquefaction?
How can soil liquefaction hazards be reduced? There are basically three possibilities to reduce liquefaction hazards when designing and constructing new buildings or other structures as bridges, tunnels, and roads. The first possibility, is to avoid construction on liquefaction susceptible soils.
How can you prevent liquefaction damage?
These methods rely on two mechanisms to reduce damage due to liquefaction: (1) delaying the development of excess pore water pressure due to earthquake shaking and (2) preventing the migration of high excess pore water pressure from untreated liquefied zones into non-liquefied areas (say underneath the structure) to …
What happens to buildings during liquefaction?
Liquefaction takes place when loosely packed, water-logged sediments at or near the ground surface lose their strength in response to strong ground shaking. Liquefaction occurring beneath buildings and other structures can cause major damage during earthquakes.
Can you build on liquefaction?
You need an engineer to work out whether you need to build foundations that provide better performance than set out in the current standard, NZS 3604:2011 (including the modifications set out in B1/AS1 and explained in this guidance).
What are the effects of liquefaction?
Introduction. Soil liquefaction has been known to cause damage to buildings, bridges, dams, highways, pipelines, and other critical elements of infrastructure. Most liquefaction damage is associated with ground failure, i.e., permanent lateral and vertical deformations.
What to do if your building has liquefaction potential?
If you are a building consent authority, and the property is situated in an identified liquefaction hazard zone on a regional hazard map, you should advise building designers and owners to seek advice from a chartered professional engineer.
When to seek professional advice for liquefaction?
If you are a building consent authority, and the property is situated in an identified liquefaction hazard zone on a regional hazard map, you should advise building designers and owners to seek advice from a chartered professional engineer. There is potential for liquefaction and/or lateral spread when all of the following conditions occur:
How are walls used to protect against liquefaction?
The well-reinforced perimeter and interior wall footings (KG) are tied together to enable them to bridge over areas of local settlement and provide better resistance against soil movements.
How does liquefaction affect buildings during an earthquake?
Extensive damage can occur to buildings and other engineered structures during earthquakes owing to liquefaction in saturated sandy soils beneath the structures. For example, hundreds of buildings were severely damaged as a result of liquefaction during the 1964 earthquake in Niigata, Japan (Seed and Idriss 1967).