地下水流動に伴う地表面傾斜量に及ぼす岩体の不均一性と地表面形状の影響

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タイトル別名
  • Effects of Heterogeneity and Surface Topography of Rock on the Surface Tilt Induced by Groundwater Flow
  • チカスイ リュウドウ ニ トモナウ チヒョウメン ケイシャリョウ ニ オヨボス ガンタイ ノ フキンイツセイ ト チヒョウメン ケイジョウ ノ エイキョウ

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In this study, first, a finite element analysis was performed for heterogeneous rocks or a homogeneous rock with a mountain/valley on the surface, to know the effects of the mechanical heterogeneity and the surface topography on the surface tilt induced by groundwater flow. Next, an inverse analysis was performed by using the surface tilts obtained for the rocks to estimate groundwater flow under the assumption that the rock mass is a homogeneous half space. The surface tilt in a two-layered rock is greater than that in a homogeneous rock since the vertical deformation at upper depths of the field of groundwater flow is greater than that in the homogeneous rock, to compensate the vertical deformation at lower depths, which is suppressed by the lower layer with higher Young’s modulus. The surface tilt of the rock with a mountain/valley on the surface is smaller/greater than that in a homogenous rock, depending on the distance of the surface to the field of groundwater flow. The surface tilt suddenly decreases beyond a fault since the fault absorbs the volumetric strain induced by the groundwater flow. Although groundwater flow is roughly estimated by the inversion of the tilt data obtained for the heterogeneous rocks under the assumption that the rocks are a homogeneous half space, groundwater flow may be overestimated or underestimated, and furthermore small artifacts appear around the real field of groundwater flow, depending the degree of heterogeneity, the roughness of the surface and the layout of the tiltmeters.

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  • 資源と素材

    資源と素材 126 (12), 660-667, 2010

    一般社団法人 資源・素材学会

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