Leaching behavior of heavy metals in excavated rocks

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  • 山岳トンネル掘削ずり処分場内の重金属の挙動把握に関する研究
  • －Data analysis by in-situ permeability test and numerical calculation－
  • ‐実現場における透水試験および数値解析に基づいたデータ分析‐

Abstract

<p>In order to propose an appropriate water sealing method at a disposal with heavy metal-containing excavated rocks prediction of the short-term and long-term elution phenomena is important. For that purpose, it is meaningful that advection / diffusion simulation by modeling the physical and chemical behavior of heavy metals through numerical analysis. So far, it is common to set the maximum elution amount from the analysis result of the sample before embankment, and it is rare to grasp the total elution behavior in the real embankment site. Regarding the dissolution characteristics, the average elution volume inside the embankment was 20% more than the original ground and the standard deviation was about half. In-site unsaturated permeability test, it was found that the saturated hydraulic conductivity differs depending on the measurement point and the test conditions, but the unsaturated permeability indicated the similar characteristic that change distinctly at the tip of the penetrating surface in the various test conditions.</p>

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