In this research, an innovative and cost-effective earthquake resistant design technique is developed using a novel geosynthetic materials that can reduce the damages of structures during devastating earthquakes. In the developed earthquake resistant technique a smart geosynthetic material known as tire chips is utilized as a seismic performance enhancer .A series of underwater i g shaking table test was conducted on a model gravity type quay wall. Two test cases were examined .One case involves a quay wall with the conventional backfill. Another case involves a similar quay wall but reinforced with tire chips. The seismic increment of the load acting on the quay wall and the associated displacement , as well as the excess pore water pressure in various locations of the backfill were measured during the tests. The results reveal that the seismic load against the caisson quay wall could be significantly reduced using the sandwiching technique. In addition, the technique could significantly reduce the earthquake-induced residual displacement of the quay wall.
Recently, a new runway designated “D-runway” was constructed at Tokyo Haneda Airport. In this project, a large amount of cement treated lightweight soils made from very soft and mildly contaminated dredged clay was used. In this paper, a seawall structure using a cement treated lightweight soil made from dredged clay is introduced and the quality control of these soils in the construction work is discussed. Two types of lightweight soils, “pneumatic mixing cement treated soil” and “air-foam treated lightweight soil,” were used as backfill in the seawall structures. Design and quality control of the lightweight soils were carried out, and the seawall structures were successfully constructed. The shear strength and bulk density of the lightweight soils placed in the sites met the required specifications in design.
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