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J. Korean Soc. Hazard Mitig. > Volume 24(5); 2024 > Article
지반방재
Journal of the Korean Society of Hazard Mitigation 2024;24(5):259-266.
DOI: https://doi.org/10.9798/KOSHAM.2024.24.5.259    Published online October 28, 2024.
연약지반 굴착시 흙막이 벽체 및 배면지반 변형특성
임길상1, 정원철2, 구춘원3, 황차은4, 진재선5, 백원진6
1정회원, 전남대학교 지역바이오시스템공학과 박사과정
2전남대학교 지역바이오시스템공학과 석사과정
3전남대학교 지역바이오시스템공학과 박사과정
4전남대학교 지역바이오시스템공학과 박사과정
5전남대학교 지역바이오시스템공학과 박사과정
6정회원, 전남대학교 지역바이오시스템공학과 교수
Wall Deflection and Ground Surface Settlement due to Braced Deep Excavation in Soft-Soil Ground
Gilsang Lim1, Wonchul Jeong2, Chunwon Ku3, Chaeun Hwang4, Jaeseon Jin5, Wonjin Back6
1Member, Ph.D. Candidate, Department of Rural & Bio-systems Eng., Chonnam National University
2Graduate of Master Course, Department of Rural & Bio-systems Eng., Chonnam National University
3Ph.D. Candidate, Department of Rural & Bio-systems Eng., Chonnam National University
4Ph.D. Candidate, Department of Rural & Bio-systems Eng., Chonnam National University
5Ph.D. Candidate, Department of Rural & Bio-systems Eng., Chonnam National University
6Member, Professor, Department of Rural & Bio-systems Eng. & BK21 Education and Research Unit for Climate-Smart Recclamed-Tideland Agriculture, Chonnam National University
Corresponding author:  Wonjin Back, Tel: +82-62-530-2151, Fax: +82-62-530-2159, 
Email: bwj215@jnu.ac.kr
Received: 10 September 2024   • Revised: 10 September 2024   • Accepted: 20 September 2024
Abstract
An extensive database comprising more than 1,100 case histories of wall displacements and ground settlements due to deep excavations in soft soils created by Long, Moormann, and Wang et al. (2009) was analyzed. The applicability of the criteria for maximum lateral displacements and ground settlements using their database was analyzed. When excavation work is conducted under ground conditions where seaweed cohesive soil is distributed thickly, excessive horizontal displacement is expected to occur owing to low undrained shear strengths. Therefore, ground reinforcement was performed by applying a reinforcement method on the excavation side to secure a stability factor against a basal heave that exceeds 3.0. When using this method, applying the management standard for the maximum horizontal displacement, i.e., 0.3%H of the retaining wall, as the limit value is considered appropriate. This is expected to minimize the horizontal displacement of the retaining wall and the subsidence of the background during excavation work.
Key Words: Fator of Stability against Basal Heave, Criteria of Maximum Lateral Displacement of Wall, Safety Evaluation for Underground Space
요지
본 연구에서는 연약지반 굴착공사가 수행된 총 1,100여 개 현장계측결과를 토대로 굴착공사 중 흙막이 벽체의 수평변위 및 배면지반 침하특성을 분석하여, 지하안전평가시 적용되는 관리기준치의 적정성을 분석하였다. 해성 점성토가 두껍게 분포된 지반 조건에서 굴착공사를 진행할 때 적은 지반강도로 인해 굴착공사 중 과다 수평변위발생이 예상되므로, 굴착저면 히빙안전율이 3.0 이상 확보되도록 굴착측의 보강공법을 적용하여 지반보강을 완료한 후, 적정 흙막이 벽체의 강성 및 지보 시스템을 반영한 흙막이 계획의 수립이 요구된다. 이러한 방법을 적용함으로써, 흙막이 벽체의 최대수평변위 관리기준치 0.3%H 정도를 한계치로 적용하는 것이 적절할 것으로 판단된다. 이를 통해 연약지반상 굴착시의 관리기준치의 설정 및 지반특성을 고려한 분석이 가능할 것으로 판단된다.
핵심용어: 굴착저면 히빙안전율, 최대수평변위 관리기준치, 지하안전평가
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