土壌地下汚染(1)

[III-460] An unsaturated column test using the excavated rocks containing arsenic

〇Haruka Maruyama¹, Yoshiaki Iwamoto¹, Yoshikazu Otsuka¹, Hiromitsu Ota¹, Hiroaki Shiraishi¹, Yuya Shimizu¹, Syuji Morita², Masafumi Okawara³ (1.Okumura Corporation, 2.Hydro Technoogy Institute Corporation, 3.Iwate University)

Keywords:excavated rocks, column test, arsenic, unsaturated seepage flow

In order to propose an appropriate water sealing method at a disposal with heavy metal-containing excavated rocks, a study of heavy metal’s elution behavior is important. In this paper, we have investigated the dissolution characteristics of arsenic using the excavated rocks in Oshikado tunnel where the excavated rocks containing natural heavy metal have been shielded by the bentonite mixed soil. The unsaturated column test of the excavated rocks was examined. And we have proposed the numerical model that estimates the elution behavior by the advective diffusion analysis.