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2026 Vol.27, Issue 10 Preview Page
A Study on Horizontal Earth Pressure in Narrow Backfills under Different Wall Inclination Conditions

좁은 공간에 조성된 뒤채움 지반의 경사조건에 따른 수평토압 연구

Byounghun Kim1
,
Hoki Ban2*
김 병훈1
,
반 호기2*
1Graduate Student, Dept. of Civil Engineering, Kangwon National University
2Professor, Dept. of Civil Engineering, Kangwon National University
*Corresponding Author
1 October 2026. pp. 27-36
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Abstract

In urban areas or under constrained construction conditions where sufficient excavation space is difficult to secure, narrow excavations are commonly used for the repair and rehabilitation of deteriorated underground structures or the installation of new buried facilities, followed by backfilling. Backfill placed within such narrow spaces is strongly influenced by arching effects induced by excavation boundary conditions. Therefore, the direct application of conventional earth pressure theories may result in discrepancies from the actual horizontal earth pressure, potentially leading to overdesign or affecting the assessment of structural stability. In this study, the distribution of horizontal earth pressure in narrowly excavated backfill was investigated through laboratory soil-box tests and numerical analyses using PLAXIS-2D, with particular emphasis on variations in boundary conditions. The results showed that horizontal earth pressure decreased as the base width decreased and the wall inclination became steeper. In addition, comparison with conventional theoretical solutions indicated that the measured horizontal earth pressures generally fell between the numerical analysis results and the values calculated using the conventional theories. These findings suggest that a comprehensive comparison and evaluation of numerical analysis results and conventional theoretical solutions are necessary for the rational assessment of horizontal earth pressure in narrowly excavated backfill.

Keywords
Narrow excavation
Backfill
Arching effect
Numerical analysis

굴착 부지를 확보하기 어려운 도심 지역이나 제한된 시공조건에서는 노후화된 지중 구조물을 보수·보강하거나 새로운 매설물을 시공하기 위해 좁게 굴착한 후 뒤채움을 수행한다. 이러한 좁은 공간에 조성된 뒤채움 지반은 굴착면의 경계조건에 따른 아칭 효과의 영향을 크게 받는다. 따라서 기존 이론식을 적용할 경우 실제 발생하는 수평토압과 차이가 발생하여 과다설계 또는 구조물의 안정성 평가에 영향을 미칠 수 있다. 본 연구에서는 좁게 굴착된 뒤채움 지반의 수평토압 분포를 분석하기 위해 경계조건 변화에 따른 수평토압의 변화를 실내 토조 실험과 지반해석 프로그램인 PLAXIS-2D를 이용한 수치해석을 통해 분석하였다. 분석 결과, 저부 폭이 좁아지고 벽면 경사가 급해질수록 수평토압이 감소하는 경향이 나타났다. 또한 기존 이론식과의 비교 결과, 실험에서 측정된 수평토압은 수치해석 결과와 기존 이론식에 의한 산정값 사이에 분포하는 것으로 나타났다. 따라서 좁게 굴착된 뒤채움 지반의 수평토압을 합리적으로 평가하기 위해서는 수치해석 결과와 기존 이론식에 대한 종합적인 비교·분석이 필요한 것으로 판단된다.

키워드
좁은 굴착
뒤채움
아칭 효과
수치해석
References
1

Ci, W., Cui, K. and Yang, S. (2025), Displacement‐Dependent Active Earth Pressure on Retaining Wall in Cohesive Soil: DEM Simulation and Theoretical Analysis, International Journal for Numerical and Analytical Methods in Geomechanics, Vol. 49, No. 16, pp. 3822~3838.

10.1002/nag.70047
2

Coulomb, C. A. (1776), Essai sur une application des règles de Maximis et Minimis à quelques problèmes de statique, relatifs à l’architecture, In Mémoires de Mathématique et de Physique, présentés à l’Académie Royale des Sciences par divers Savans, Vol. 7, pp. 343~382.

3

Damians, I. P., Yu, Y., Lloret, A., Bathurst, R. J. and Josa, A. (2015), Equivalent interface properties to model soil-facing interactions with zero-thickness and continuum element methodologies, In From Fundamentals to Applications in Geotechnics, pp. 1065~1072.

10.3233/978-1-61499-603-3-1065
4

Frydman, S. and Keissar, I. (1987), Earth pressure on retaining walls near rock faces, Journal of Geotechnical Engineering, Vol. 113, No. 6, pp. 586~599.

10.1061/(ASCE)0733-9410(1987)113:6(586)
5

Handy, R. L. (1985), The arch in soil arching, Journal of Geotechnical Engineering, Vol. 111, No. 3, pp. 302~318.

10.1061/(ASCE)0733-9410(1985)111:3(302)
6

Jaky, J. (1944), The coefficient of earth pressure at rest, Journal of the Society of Hungarian Architects and engineers, pp. 355~358.

7

Kellogg, C. G. (1993), Vertical earth loads on buried engineered works, Journal of geotechnical engineering, Vol. 119, No. 3, pp. 487~506.

10.1061/(ASCE)0733-9410(1993)119:3(487)
8

Khosravi, M. H., Sarfaraz, H., Pipatpongsa, T. and Sharifdeljuyi, A. (2022), Active earth pressure distribution inside narrow backfill considering soil-arching effect, International Journal of Geomechanics, Vol. 22, No. 7, 06022013.

10.1061/(ASCE)GM.1943-5622.0002434
9

Kim, H., Ban, H. and Moon, C. (2017), Horizontal Earth Pressure of the Backfill in the Narrowly Excavated Ground Considering Various Boundary Conditions, Journal of the Korean Geo-Environmental Society, Vol. 18, No. 11, pp. 19-26. (In Korean)

10

Lee, S. and Kang, S. (2011), A study on the lateral earthpressure at behind structure for backfill by sand, Journal of the Korean Geosynthetics Society, Vol. 10, No. 4, pp. 11~18. (In Korean)

11

Lin, Y. J., Chen, F. Q. and Lv, Y. P. (2021), Analytical solutions for the earth pressure of narrow cohesive backfill with retaining walls rotating about the top, Acta Geotechnica, Vol. 16, No. 9, pp. 2975~2995.

10.1007/s11440-021-01187-9
12

Marston, A. (1930), The theory of external loads on closed conduits in the light of the latest experiments, Vol. 96, Iowa State College, pp. 138~170.

13

Moon, C. (2003), A Modification Study on Horizontal Earth Pressure in the Symmetrically Sloped Backfilled Space, Journal of the Korean Geo-Environmental Society, Vol. 4, No. 2, pp. 57~64.

14

Moon, I. (2016), Earth Pressure Characteristics of Retaining Wall with Relieving Platform Using Model Test and Numerical Analysis, Ph.D. Dissertation, Myongji University, pp. 1~114. (In Korean)

15

Paik, K. H. and Salgado, R. (2003), Estimation of active earth pressure against rigid retaining walls considering arching effects, Geotechnique, Vol. 53, No. 7, pp. 643~653.

10.1680/geot.2003.53.7.643
16

Rankine, W. J. M. (1857), II. On the stability of loose earth, Philosophical Transactions of the Royal Society of London, Vol. 147, pp. 9~27.

10.1098/rstl.1857.0003
17

Spangler, M., G. and Handy, R., L. (1984), Soil Engineering 4th ed, Harper and Row, New York, pp. 482~484.

18

Take, W. A. and Valsangkar, A. J. (2001), Earth pressures on unyielding retaining walls of narrow backfill width, Canadian Geotechnical Journal, Vol. 38, No. 6, pp. 1220~1230.

10.1139/t01-063
19

Terzaghi, K. (1936), Stress distribution in dry and in saturated sand above a yielding trap-door, Vol. 1, pp. 307~311.

20

Yang, K. H. and Liu, C. N. (2007), Finite element analysis of earth pressures for narrow retaining walls, Journal of GeoEngineering, Vol. 2, No. 2, pp. 43~52.

Information
  • Publisher :Korean Geo-Environmental Society
  • Publisher(Ko) :한국지반환경공학회
  • Journal Title :Journal of the Korean Geo-Environmental Society
  • Journal Title(Ko) :한국지반환경공학회 논문집
  • Volume : 27
  • No :10
  • Pages :27-36
  • Received Date : 2026-08-19
  • Revised Date : 2026-08-20
  • Accepted Date : 2026-09-09
  • DOI :https://doi.org/10.14481/jkges.2026.27.10.27
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