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2026 Vol.42, Issue 2 Preview Page
Analytical Method for Depth-dependent Lateral Pressure Coefficient of Rock Mass Using Tunnel Convergence Monitoring Data

터널 변위 계측 결과를 활용한 암반의 심도별 측압계수 분석 방법에 관한 연구

Jun-Seok Moon1
,
Kwang-Young Kim2
,
Kang-Il Lee3*
문 준석1
,
김 광영2
,
이 강일3*
1Member, Ph.D. Student, Dept. of Civil and Environmental Engineering, Daejin Univ.
2Member, Ph.D. Student, Dept. of Civil and Environmental Engineering, Daejin Univ.
3Member, Prof., Dept. of Smart Civil and Environmental Engineering, Daejin Univ.
1정회원, 대진대학교 토목환경공학과 박사과정
2정회원, 대진대학교 토목환경공학과 박사과정
3정회원, 대진대학교 스마트건설환경공학과 교수
*Corresponding Author
30 April 2026. pp. 113-123
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Abstract

The lateral earth pressure coefficient of rock masses is ideally determined through in-situ tests. However, these tests are often limited by their high difficulty and cost. In this study, we analyzed tunnel convergence measurements from a site in the ○○ area of Chungbuk using regression analysis to estimate the final convergence. We then evaluated the depth-dependent lateral earth pressure coefficient of the rock mass through back analysis based on the estimated final convergence. The estimated lateral earth pressure coefficients were validated by comparing them with results from field tests. The findings indicated that the lateral earth pressure coefficient was in the range of Ko = 1.16–2.46 based on monitoring data and Ko = 1.86–2.61 based on hydraulic fracturing tests, demonstrating a generally similar trend. In addition, regression analysis using various nonlinear functions revealed that a reciprocal function provided the best fit for representing the depth-dependent lateral earth pressure coefficient. Accordingly, this study recommends using a reciprocal-type empirical equation for estimating the lateral earth pressure coefficient of rock masses in this region.

Keywords
In-situ test
Lateral earth pressure coefficient
Rock masses
Tunnel convergence data

암반의 측압계수는 현지반시험을 통해 산정하는 것이 가장 바람직하나 현지반시험을 수행하기 위해서는 많은 시간과 고비용, 고난도의 기술이 요구되므로 쉽게 적용되지 못하고 있다. 이에 따라 본 연구에서는 터널 현장의 계측자료를 회귀분석하여 최종변위를 산정하고, 산정된 최종변위에 대한 역해석을 통해 암반의 심도별 측압계수를 산정하여 암반특성에 맞는 측압계수 산정방법을 제시하고자 하였다. 또한 계측자료에 의해 결정된 측압계수의 적정성을 평가하기 위해 대상 현장에서 시행된 현장시험 결과와 비교·분석하였다. 연구결과, 계측자료를 이용한 측압계수는 Ko=1.16~2.46, 수압파쇄시험을 이용한 측압계수는 Ko=1.86~2.61로 나타나 전반적으로 유사한 경향을 보였다. 또한 다양한 비선형 함수에 대한 회귀분석 결과, 연구 대상인 충북 ○○지역 암반의 심도별 측압계수는 역비례 함수의 형태가 가장 적합한 것으로 나타났으며 심도별 측압계수의 분포곡선은 Ko=1.020+35.388/z 함수식을 제안하였다.

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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 : 42
  • No :2
  • Pages :113-123
  • Received Date : 2026-03-30
  • Revised Date : 2026-04-16
  • Accepted Date : 2026-04-16
  • DOI :https://doi.org/10.7843/kgs.2026.42.2.113
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