Occurrence and Influence of acid Leachate by Pyrite in Underground Rocks of Road Construction Field in the Miryang Area

Sun Hee Chae; Chan Ho Jeong; Yu Jin Lee; Yong Cheon Lee; Sang Sik Shin; Jun Sik Park; Song Min Ou

doi:10.9720/kseg.2018.3.501

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2018 Vol.28, Issue 3 Preview Page

Research Article

Occurrence and Influence of acid Leachate by Pyrite in Underground Rocks of Road Construction Field in the Miryang Area 밀양지역 도로건설 현장 지반암석내 분포하는 황철석에 의한 산성침출수 발생과 영향

30 September 2018. pp. 501-512

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Abstract

The acid leachate derived from the sulfide mineral such as pyrite can cause problems such as aging of infrastructure and environment contamination around the civil construction site. The purpose of this study is to assess the environmental effect of an acid leachate derived from pyrite in the Miryang area under road construction. In this study, 13 samples of situ core were used for the net acid generation (NAG) experiment. The chemical composition including pH, oxidation and reduction potential (ORP) and electrical conductance of water samples produced from the NAG test was analyzed. In additional, five polished thin sections of rock cores were made for electro microprobe analyses. In the results of the NAG tests, 7 samples showed lower values than pH 3.5. It strongly indicated that these areas are under the environmental and infrastructure damage by the acid leachate. The chemical type of the 7 samples was classified as the Fe(Ca)-SO₄ type, which is totally a different type compared to general groundwater. The concentration of total sulfur ranges from 0.004% to 12.5%. 6 rock samples are plotted on a potentially acid forming zone in the relation diagram between the total sulfide and NAG-pH. In conclusion, it is suggested that a protection method against an environmental demage and an infrastructure corrosions by the acid leachate should be prepared in all of areas under a road construction.

Keywords

acid leachate

pyrite

net acid generation

chemical composition

건설현장의 지반내 황철석 등은 산성침출수를 발생시켜 주변환경 및 기반시설의 노화 촉진과 같은 문제를 야기한다. 이 연구에서는 밀양지역 도로공사구간의 시추코어를 대상으로 황철석에 의한 순 산발생량 평가 및 침출수의 화학성분을 분석을 통하여 도로공사구간에 미치는 영향을 알아보고자 하였다. 이를 위하여 시추코어 시료 13점을 확보하여 순 산발생량(NAG)시험 , pH, 산화환원전위, 전기전도도를 측정하고 화학성분을 분석하였다. 아울러 시추코어의 연마박편을 제작하여 전자현미분석을 실시하였다. 순 산발생량 시험결과, 산성배수의 가능성이 높고 관리가 필요한 pH 3.5 이하는 7지점이며, 화학성분은 Fe(Ca)-SO₄ 유형을 보인다. 코어내 전황 함량은 0.004~12.5%의 범위를 보이며, 전황(T-S)과 NAG-pH간 상관관계에서 6개의 시료가 산성암반배수 영역에 도시되었다. 따라서 도로공사 구간 전반에 걸쳐 산성배수로 인한 주변 환경 피해 및 시설물 노화 등에 대비하는 조치가 필요할 것이다.

키워드

산성침출수

황철석

순 산발생량

화학성분

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Information

Publisher :Korean Society of Engineering Geology
Publisher(Ko) :대한지질공학회
Journal Title :The Journal of Engineering Geology
Journal Title(Ko) :지질공학
Volume : 28
No :3
Pages :501-512
Received Date : 2018-09-07
Revised Date : 2018-09-20
Accepted Date : 2018-09-27
DOI :https://doi.org/10.9720/kseg.2018.3.501

The Journal of Engineering Geology ISSN:1226-5268(Print) 2287-7169(Online) 지질공학

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