Study on Liquefaction Countermeasure Technique By Using Logs With Drainage Function for Residential Houses

Abstract eng:
A technique of ground reinforcement by installing logs into loose saturated sand layer was proposed as a countermeasure against soil liquefaction. The principle of this method is based on compaction of soil. Because a target performance of the method is set against the Level 1 earthquake ground motions, it is necessary to improve the method by using other technique together or adding a new function in order to guarantee the seismic performance against Level 2 earthquake ground motions. The log with drainage function based on a water pressure dissipation method was proposed in this study. This log was made by opening holes in a core and on the surface. The principle of the method is to dissipate water pressure when an excess pore water pressure increases by Level 2. Small scale shaking table tests were conducted to evaluate the effectiveness of the piling log with drainage for a new and existing residential house. As a result, the log with drainage could reduce the rate of accumulation of excess pore water pressure and increase the velocity of its dissipation. Furthermore, the settlement of house could be mitigated because the effect of log with drainage improved liquefaction resistance and seismic performance.

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