神戸空港島浚渫土処分地における盛土造成後の沈下予測について

In order to dispose of dredged clay effectively, it is important to plan the dredged clay disposal based on the settlement prediction in advance and to understand accurately the acceptable quantity of dredged clay in the disposal pond. However, it is still a great challenge to understand properly the consolidation characteristics of the dredged clay for the settlement prediction. The authors have already examined, in the disposal pond at Kobe airport, the settlement of the clay was calculated using the volume ratio ƒ represented uniformly by logƒ for the consolidation characteristics of clay (compressibility, permeability and consolidation velocity) by soil improvement after dredged clay was disposed of several times, and then additional dredged clay was disposed of. And the calculation was compared to the measurements of various properties, which agree well with calculation results. After the completion of the dispose of dredged clay, the supernatant in the pond was drained, and then land forming has been done. The authors performed calculations with the proposed consolidation method against the bed of dredged clay with the complex complicated disposal history. It is reported that the results agree mostly with the measured settlement, pore water pressure and the water content at the site. In addition, it is reported that residual settlement prediction is calculated including the settlement of alluvial clay bellow the dredged clay.