Determination of Phreatic Lines in Small Earth Dams Using Geosynthetic Clay Liners

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  • ジオシンセティッククレイライナーが敷設されたため池堤体の浸潤線設定方法の提案
  • ジオシンセティッククレイライナー ガ フセツ サレタ タメイケテイタイ ノ シンジュンセン セッテイ ホウホウ ノ テイアン

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<p>Although geosynthetic clay liners (GCLs) have been increasingly used in recent years for retrofitting small earth dams because of the shortage of core materials, design methods for small earth dams using GCLs have not yet been established. A challenge is that a method for drawing the phreatic line downstream of GCLs has not been developed yet, and calculations for the downstream embankment stability cannot be performed adequately. In this study, a parallelogram including a GCL was proposed as a virtual sloping core to apply the proven method for conventional sloping cores to the GCL. In addition, a method of determining the hydraulic conductivity of a virtual sloping core, including multiple soil materials, that is, an embankment material and a GCL, was proposed. It was verified through FEM of seepage flow that the phreatic line set using the proposed method was reasonable.</p>

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