岩石の比抵抗に対する割れ目とその挟在物の影響

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タイトル別名
  • Influence of fracture and its filling materials on rock resistivity.
  • ガンセキ ノ ヒテイコウ ニ タイスル ワレメ ト ソノ キョウザイブツ ノ

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抄録

Geophysical investigation, by methods such as electrical and electromagnetic surveys, has recently been applied to construction projects such as underground excavation. In order to interpret resistivity profiles derived from these methods, it is necessary to study the influence of fracture and its filling materials on rock resistivity. In this paper, the influence of a fracture on resistivity of rock specimens such as granite, shale, welded tuff and tuff was investigated, and the effect of fracture filled with clay was studied. Experiments showed that the rock resistivity containing a fracture in the direction parallel to the electric current was described by the resistivity model in which intact rock resistivity and fracture resistivity are regarded as being in parallel, and the influence of the fracture filled with clay was important. The experimental results of the rock containing the fracture in the direction perpendicular to the current was described by the model in which intact rock resistivity and fracture resistivity are regarded as being in a series, and in this case the influence of fracture is little.<BR>Based on the results of these experiments, we considered the resistivity model of a rock mass included many fractures. This model is expressed that intact rock resistivity and fracture resistivity are in parallel, and by introducing a coefficient a that varies with the state of fracture, we generalized this model for a rock mass that includes various fractures. To confirm this model experimentally, we used heat to create rock mass models including fractures from granite and diorite. Resistivity was then measured under various pore water resistivities. By regarding the resistivity of these specimens as rock mass resistivity, the results of calculation by this model were compared with the experimental results. When α was 0.3, the calculation results agreed well with the experimental results. Lastly, by using this model, the resistivity of fractured rock mass was calculated for various conditions. The calculations can be used to estimate the resistivity of rock mass containing fractures.

収録刊行物

  • 応用地質

    応用地質 38 (4), 213-223, 1997

    一般社団法人 日本応用地質学会

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