Abstract
As one of the secondary geologic hazards of Earthquakes, liquefaction has been researched since 1960s in USA, Japan, etc. Scientists researched many methods and field tests used to determine liquefaction. This paper uses the results of Standard Penetration Tests (SPT) and NCEER (USA Nation Center for Earthquake Engineering Research) methods to evaluate the liquefaction in District 7, Ho Chi Minh City. The result showed that 50% wards in the study area occurs this phenomenon. The map of liquefaction zone was made and it can be used to construction management.
Highlights
Following disastrous earthquakes in Alaska and in Niigata, Japan in 1964, Seed and Idriss (1971) developed and published the basic ‘‘simplified procedure’’
NCEER method compares between cyclic resistance ratio(CRR) and the cyclic stress ratio(CSR), this method needs to determine the magnitude scaling factors(MSF)in the study area to calculate the coefficient of FS
Seventy boreholes have enough data to calculate and the liquefaction can occur in 25 boreholes
Summary
Following disastrous earthquakes in Alaska and in Niigata, Japan in 1964, Seed and Idriss (1971) developed and published the basic ‘‘simplified procedure’’. That procedure has been modified and improved periodically since that time, primarily through landmark papers by Seed (1979), Seed and Idriss (1982), and Seed et al (1985). The liquefaction refers to the phenomena of seismic generation of large pore-water pressures and consequent softening of granular soils. The liquefaction is very dangerous phenomenon such as increase of shear strength, soil deformation, and ground failure. “The simplified procedure” (named NCEER in this paper) was developed from empirical evaluation of field observations, field tests and laboratory tests data. Sand layers soften quickly, allowing large cyclic deformations to occur. The softening is accompanied by a loss of shear strength that may lead to large shear deformations or even flow failure under moderate to high shear stresses, such as a foundation or slope.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
