Rapid evaluation and effective control of potential environmental impact of soils and rocks containing natural derived heavy metals

在含有天然重金属的地质层中进行挖掘或采矿作业时，对挖掘物造成的环境影响进行快速评估和经济有效的控制是日本的重大岩土工程问题。本研究提出了简化的实验室测试方法来估计长期浸出量的砷和铅的天然所含的开挖岩石，通过比较的几个实验室浸出试验和长期户外暴露试验，在一年以上进行。此外，两种修复技术的长期性能：1）现场遏制与矿物屏障和2）异地砷去除污染的地下水使用零价铁，进行了实验验证。

When excavation or mining works are executed at geological stratums that contain heavy metals with natural origin, rapid evaluation and cost-effective control of environmental impact caused by excavated materials are big geotechnical issues in Japan. This research proposed simplified laboratory testing methods to estimate long term leaching amounts of arsenic and lead naturally contained in excavated rocks, by comparing the results of several laboratory leaching tests and long term outdoor exposure tests which were conducted in more than 1 year. In addition, long term performance of two remediation technologies ; 1) on-site containment with mineral barriers and 2) ex situ arsenic removal from contaminated groundwater using zero valent iron, were experimentally verified.