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2021 Vol.20, Issue 3

Research Article

A Pilot Test for the Utilization of Road Subsoil of the Tertiary Mudstone in Pohang Basin

포항분지 제3기 이암의 도로 노체 활용을 위한 현장시험

Jeong-Sik Gong1
,
In-Woo Baek2
,
Jae-Gon Kim3
,
Young-Suk Song4
,
Tae-Hyung Kim5*
공 정식1
,
백 인우2
,
김 재곤3
,
송 영석4
,
김 태형5*
1Nonmember, Graduate Student, Dept. of Civil and Environ. Eng., Korea Maritime and Ocean Univ., 727 Taejoung-ro, Yeongdo-gu, Busan 49112, Republic of Korea
2Nonmember, Graduate Student, Dept. of Civil and Environ. Eng., Korea Maritime and Ocean Univ., 727 Taejoung-ro, Yeongdo-gu, Busan 49112, Republic of Korea
3Nonmember, Principal researcher, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Republic of Korea
4Member, Principal researcher, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Republic of Korea
5Member, Professor, Dept. of Civil Eng., Korea Maritime and Ocean Univ., 727 Taejoung-ro, Yeongdo-gu, Busan 49112, Republic of Korea
*Corresponding Author
30 September 2021. pp. 1-10
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Abstract

The purpose of this study is to present the possibility a utilization of the tertiary mudstone in Pohang as road subsoil material through pilot experiments on the road embankment structure. This mudstone is an unconsolidated rock that is distributed in the soft rock sedimentary layer, the tertiary layer of the Cenozoic, and causes physical problems such as slaking, swelling, and reduced shear strength and chemical problem like acid drainage. In order to solve various complex problems, an laboratory mixing test was conducted, and the optimal mixing conditions of the tertiary mudstone (90%), composite slag (steel making 70%, blast furnace 30%), and neutralization and coating agent treatment were derived. In order to prove its utilization, a real-scale road embankment structure was constructed and tests were conducted for each section. The pre-processing section is stable due to the design of optimal mixing conditions, while in post-processing section, natural weathering proceeded rapidly, and structural problems were concerned. Since the effect of neutralizing and coating agents was confirmed in temporary-staking section, the neutralizing and coating agents can be applied during the temporary storage period.

Keywords
Road subsoil
Tertiary mudstone
Composite slag
Slaking
Swelling
Acid drainage

본 연구는 성토구조체 현장실험을 통해 포항 지역의 제3기 이암을 도로 노체 재료로 활용하기 위한 가능성을 검토하는 제시하는 것이다. 이 이암은 신생대 제 3기층인 연암퇴적층에 분포하고 있는 미고결화 암석으로 슬레이킹, 팽윤 현상, 전단강도 저하와 같은 물리적 문제와 산성배수라는 화학적 문제가 발생한다. 여러 복합적 문제 해결하기 위해 실내 배합 시험을 진행하였으며 제 3기 이암(90%)과 복합슬래그(제강 70%, 고로 30%)와 중화･코팅제 처리의 최적 배합 조건을 도출했으며, 이를 실증하기 위해 실제 규모의 도로 성토구조체를 시공하여 구간별 현장 시험을 진행했다. 사전처리구간은 최적 배합 조건 설계로 인해 안정이 유지되는 반면, 무처리구간은 자연 풍화가 빠르게 진행되어 구조적 문제 발생이 우려되었으며, 가적치구간은 중화･코팅제 효과가 확인됨에 따라 임시 적치 시기에 적용 가능함을 확인했다.

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Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 20
  • No :3
  • Pages :1-10
  • Received Date : 2021-06-19
  • Revised Date : 2021-08-20
  • Accepted Date : 2021-09-15
  • DOI :https://doi.org/10.12814/jkgss.2021.20.3.001
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