On Preventing Liquefaction of Level Ground Using Gravel Piles

Tanaka, Yukihisa; Kokusho, Takaji; Esashi, Yasuyuki; Matsui, Ietaka

doi:10.2208/jscej.1984.352_89

Cited by 4 publications

(1 citation statement)

References 3 publications

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“…The gravel drain method (Tanaka et al 1984) can be used to prevent the liquefaction of loose sands. A recent method for the prevention of liquefaction (Nakamura et al 1988) has been developed, in which many small porous pipes are installed in the ground by a powered auger.…”

Section: Recent Soil Improvement Methods Used In Japanmentioning

confidence: 99%

A precompression method of soft ground improvement using dewatering

Kotera

Sakemi

Matsui

1991

EGSP

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The background and geology of the Tokyo Bay area of Japan, and recent soil improvement methods used in Japan are described. The vertical drain method has frequently been used to improve thick quarternary deposits in this area. This paper describes a case history of a dewatering method in combination with the vertical drains and preloading in a major soft ground improvement project in the Urayasu area of the Tokyo Bay. The dewatering method is a vacuum consolidation method, which is tentatively applied to the soft clay ground.In the combined dewatering method, the waterhead in a vertical sand drain is lowered by pumping the water from a sand layer within or below a soft clayey layer using deep wells. The dewatering applies negative water pressure to the soft clayey layer, promoting its consolidation.The authors confirm the consolidation effect of the dewatering and establish the applicability of the combined dewatering method to the soft clay ground.It is concluded that the dewatering method described significantly increases the shear strength and the consolidation yield stress of the soft clayey layer. BACKGROUND OF TOKYO BAY AREA

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Section: Recent Soil Improvement Methods Used In Japanmentioning

confidence: 99%