| dc.description.abstract | Liquefaction is the behavior of soil in which soil in saturated soil
decreases and strength decreases due to increased pore water
pressure during soil vibration caused by an earthquake. If the
liquefaction potential is not properly calculated during
infrastructure construction, changes in ground strength during an
earthquake can cause infrastructure to collapse or deteriorate. A
liquefaction event in the city of Palu caused the ground surface to
shift and sink, destroying infrastructure in the area. Based on this,
the liquefaction potential of Palu city should be thoroughly analyzed
in order to determine the liquefaction risk before construction.
A simplified method proposed by Seed & Idriss (1971) calculates
the value of the factor of safety (FS) based on the SPT data by
comparing the values of CSR (Cyclic Stress Ratio) and CRR (Cyclic
Resistance Ratio). Iwasaki et al. (1978, 1982) continued the
simplification using the liquefaction potential index (LPI) method,
providing results in the form of predictions of soil layer
performance and liquefaction potential of the soil surface.
As a result of analysis using the LPI method, it was found that Palu
City is an area with the potential for liquefaction with different LPI
values for each location. Point B-1 is a very high liquefaction
potential point with LPI value of 66.11 under the condition of Mw
7.5. An increase in the magnitude of an earthquake will affect the
magnitude of LPI value. The larger the size scale, the larger LPI
value analyzed. | en_US |
