Leaching behavior of heavy metals in excavated rocks Data analysis by in-situ permeability test and numerical calculation

• Published in: Japanese Geotechnical Journal Vol. 15; no. 1; pp. 181 - 197
• Main Authors: MORITA, Shuji, CHO, Chika, OTA, Hiromitsu, KURASHINA, Haruka, SHIMIZU, Yuya, IWAMOTO, Yoshiaki, OKAWARA, Masafumi
• Format: Journal Article
• Language: English; Japanese
• Published: Tokyo The Japanese Geotechnical Society 31.03.2020; Japan Science and Technology Agency
• Subjects: Advection; Chemical behavior; Computer simulation; containment; drilling slide repository; Elution; elution of harmful substances; Embankments; Heavy metals; Hydraulic conductivity; Leaching; Metals; natural heavy metals; Numerical analysis; Permeability; Permeability tests; Rock; Rocks; simulation
• ISSN: 1880-6341; 1880-6341
• DOI: 10.3208/jgs.15.181

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.