Abstract
In this research, we discussed about the newly ground improvement and countermeasure of liquefaction technology for the seabed based on the microbial functions. This study examined the feasibility of in-situ bio mineralization technologies for the sediment from deep sea area which are located near the surface types of the methane hydrate (depth is the -540m) in Japan sea. Authors used the pre-cultivation which are enhancement of the urease activity from in-situ sediment and the cyclic triaxial test to evaluate the enhancement of the liquefaction strength with three types of microorganisms. The main findings of this research were as follows:(1) the urease activity microorganisms from the deep sea sediment can enhance calcite precipitation during the three weeks cultivation, (2) Surface of the seabed sediment can precipitate the calcite and improvement of liquefaction strength. , (3) The enrichment culture from the deep sea area can enhancement of the liquefaction strength as a solidification of specific microorganisms named Bacillus pasteurii.
