軽量混合処理土の大水深への適用

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In the Ohoi Container Pier of Tokyo Bay, the earth-quake-proof quays have been under construction. They can resist against Level 11 earthquake force. At the Berth No. 9,air foamed light-weight geomaterial (SGM) was used for backfilling of bulkhead behind the earthquake-proof quay. In this paper, the results of laboratory tests and field tests are reported with the construction results where SGM can be constructed in deep sea water and the new technology. In this work, two earthquake-proof ways about 30 m wide between the earthquake-proof quay and the container back-yard were aimed to construct, so sands and stones were replaced by SGM (a.10,000 m^3) at the backfilling of the existing bulkhead. The SGM can make the earth-quake-pressure to the bulkhead lower. SGM is composed with (1)soil material which is the excavated soil at the back-filling made slurry with water, (2)air foam which made from synthetic detergent and air, and (3)cement. SGM were used on past construction projects in Japanese ports and air-ports, many technological difficulties have been overcome. But, the technology of this project is the highest of them. , There were two technological problems in this project, which are (1)the discharging distance of SGM was about 200 m long, and soil material of SGM was supplied only from existing sandy soil excavated from the site (sandy soil is commonly not good for air foam) , (2)CSGM was set up in about 10 m depth. Accordingly, two method were used, (1) soil material excavated was classified, and re-mixed to use little volume of clay faction efiiciently. Additionally, viscosity of cement is adopted for assistant effect. (2)the density change of SGM during mixing-discharging-set-ting-up-curing could be predicted by the results of peparative laboratory tests and field experiments, when soil property was changing. According to the density change, the volume of water and air foam were controlled adequately. The whole system of SGM quality control was developed successfully in this project. Therefor the set-ting-up of SGM can be applied in deep water condition, whichever its density is smaller than sea water under atmosphere.
2002-05-01

軽量混合処理土の大水深への適用

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