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2023 Vol.39, Issue 7 Preview Page
Analysis of Stability and Behavior of Slope with Solar Power Facilities Considering Seepage of Rainfall

태양광 발전시설이 설치된 사면의 강우시 침투를 고려한 안정성 및 거동 분석

Jeong-Yeon Yu1
,
Dong-Gun Lee2
,
Ki-Il Song3*
유 정연1
,
이 동건2
,
송 기일3*
1Graduate Student, Dept. of Civil Engrg., Inha Univ.
2Graduate Student, Dept. of Civil Engrg., Inha Univ.
3Member, Prof., Dept. of Civil Engrg., Inha Univ.
1비회원, 인하대학교 토목공학과 석사과정
2비회원, 인하대학교 토목공학과 박사과정
3정회원, 인하대학교 사회인프라공학과 교수
*Corresponding Author
31 July 2023. pp. 57-67
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Abstract

Slope failures during rainfall have been observed in mountainous areas of South Korea as a result of the presence of solar power facilities. The seepage behavior and pore pressure distribution differ from typical slopes due to the presence of impermeable solar panels, and the load imposed by the solar power structures also affects the slope behavior. This study aims to develop a method for evaluating the stability of slopes with solar power facilities and to analyze vulnerable points by considering the maximum slope displacement. To assess the slope stability and predict behavior while considering rainfall seepage, a combined seepage analysis and finite difference method numerical analysis were employed. For the selected site, various variables were assumed, including parameters related to the Soil Water Characteristic Curve, strength parameters that satisfy the Mohr-Coulomb failure criterion, soil properties, and topographic factors such as slope angle and bedrock depth. The factors with the most significant influence on the factor of safety (FOS) were identified. The presence of solar power facilities was found to affect the seepage distribution and FOS, resulting in a decreasing trend due to rainfall seepage. The maximum displacement points were concentrated near the upper (crest) and lower (toe) sections of the slope.

Keywords
Displacement
FOS
Rainfall
Slope stability
Slope with solar power facilities

우리나라에 분포하는 산지 태양광 발전시설에 의해 강우시 사면파괴가 발생하고 있다. 이때 불투수면인 태양광 패널을 따라 흐르는 강우로 인해 침투 작용이 일반적인 사면과 달라 간극수압 분포가 차이를 보이며 태양광 구조물의 하중에 의해 지반 거동에 차이가 있다. 따라서 본 연구에서는 강우시의 태양광 발전시설이 설치된 사면의 안정성 평가 방법을 개발하고, 최대 사면 변위 지점을 통해 취약지점을 분석하였다. 강우의 침투에 따른 안정성을 평가하고 거동을 예측하기 위해 침투해석과 유한차분법 수치해석을 연계하였다. 대상 현장에 대해서는 함수특성곡선 변수, Mohr-Coulomb 파괴 기준을 만족하는 강도 정수 및 지반 물성치, 사면의 각도와 기반암의 깊이 등의 지형적 인자를 가정하였으며 이들 중 안전율에 가장 큰 영향을 미치는 인자에 대해 검토하였다. 태양광 발전시설의 유무에 따라 침투 양상 및 안전율에 차이가 있으며 강우 침투에 따라 안전율이 감소하는 경향을 보이는 것으로 나타났다. 또한 최대 변위 지점은 사면의 상단부와 하단부 인접 지점에 집중적으로 분포하였다.

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 39
  • No :7
  • Pages :57-67
  • Received Date : 2023-06-30
  • Revised Date : 2023-07-12
  • Accepted Date : 2023-07-12
  • DOI :https://doi.org/10.7843/kgs.2023.39.7.57
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