著者
安池 慎治 鈴木 裕一
出版者
公益社団法人 日本地下水学会
雑誌
日本地下水学会会誌 (ISSN:00290602)
巻号頁・発行日
vol.28, no.4, pp.163-171, 1986 (Released:2012-12-11)
参考文献数
12
被引用文献数
2

The Kanto Loam is a deposit of the volcanic ash, and is widely distributed in the Kanto district. The purpose of this paper is to clarify the effects of tube-like macropores on hydraulic conductivities and on its anisotropy of the Kanto Loam. The permeability tester developed for this study was used to measure the anisotropy of conductivities. By using this device, it is possible to obtain the conductivities of two directions (vertical and horizontal) in one sample, simultaneously. Undisturbed soil samples for this measurements were taken at the outcrop in Kawasaki city in every 1 meters height. As a result, the following conclusions are obtaind.1. The hydralic conductivities of the layer with many tube-like macropores is much larger than that of layer with few macropores. The magnitude of the difference is 10 times in horizontal direction and 100 times in vertical.2. The anisotropy of the hydraulic conductivity is also much influenced by the effects of tube-like macropores. Without tube-like macropores, the ratios of Kv (vertical hydraulic conductivity) to Kh (horizontal one) range from 1.0 to 1.5, while with macropores, the ratios of Kv to Kh range from 3.0 to 20.

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参考までに、「水はけが良い」関東ローム層の透水係数の実測例。 10^-3~10^-5(横方向)くらいにみえます。先の表の安山岩の透水係数と比較してみて驚きました。 関東ローム層の透水性とその異方性について… https://t.co/Ij5Wmwr2Vc
関東ローム層の間隙率(水が浸透できる隙間)は、75パーセントくらいありますね。 水浸し(飽和)にすると体積の3/4は水になります。 関東ローム層の透水性とその異方性について https://t.co/JSmkunQ8Ew

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