THE EFFECT OF CRACK GEOMETRY ON HYDRODYNAMIC DISPERSION IN CRACKED MEDIA

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概要

• 論文の詳細を見る

• rights: 社団法人地盤工学会rights: 本文データは学協会の許諾に基づきCiNiiから複製したものであるrelation: IsVersionOf: http://ci.nii.ac.jp/naid/110003946011/A theoretical as well as a numerical study has been carried out with special emphasis on developing a basic understanding of how crack geometry influences hydraulic phenomena such as permeability and hydrodynamic dispersion in cracked bodies. The permeability tensor K_<ij> is formulated in terms of length, aperture and orientation of cracks plus one more non-dimensional scalar λ depending on connectivity among cracks. By extending the Robinson's formula, a general expression for λ is given as a function of density and anisotropy of existing cracks. Dispersion tensor D_<ij> con-sists of two different sources. The first comes from the fact that each tracer is forced to move along cracks the directions of which deviate from the mean path. The second comes from non-uniform distribution of hydraulic head throughout a cracked body. The second source has increasing importance not only when crack density is low, but also when crack arrangement is highly anisotropic. The distribution of head becomes extremely non-uniform, especially when overall hydraulic head gradient is parallel to the preferred orientation of cracks. The permeability tensor K_<ij> is isotropic so long as the related crack tensor N_<ij> is isotropic. Dispersion tensor D_<ij> is anisotropic unless the fourth-rank crack tensor N_<ijkl> is isotropic. Accordingly, any crack body characterized by an isotropic permeability tensor is not necessarily isotropic in dispersion.

• 社団法人地盤工学会の論文
• 1996-06-15

著者

• 小田 匡寛

  Department Of Foundation Engineering Saitama University

• 金丸 正幸

  Kokusaikogyo Co., Ltd, No. 2

• 岩下 和義

  Department of Civil and Environmental Engineering, Saitama University

• 金丸 正幸

  Kokusaikogyo Co. Ltd No. 2

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