THE SETTLEMENT, HARDNESS AND LIQUEFACTION OF SAND BEDS DUE TO FLUCTUATING WATER PRESSURE

Takaaki Minamimura, Masaki Niiyama, Takao Akutu, Kenji Yano, Toshihiko Yamashita

Abstract


The degree of sand beds compaction affects the accumulation and erosion of shorelines, and the popuration of creatures which live in sandy beach. The properties of the settlement, hardness and liquefaction of sand beds due to fluctuating water pressure were experimentally studied. The settlement of a sand bed was accelerated by liquefaction .The thickness of liquefaction layer which is estimated from the measured values of excess pore water pressure agreed well with one from the measured values of the rate of settlement. The hardness of sand bed was determined only by void ratio independent of liquefaction or non-liquefaction beds.

Keywords


water pressure; pressure fluctuation; liquefaction; bed

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