Optimal Wall Thickness Determination by Excavation Depth for Self-supporting Soil Retaining Walls Using a Vertical Vibrating Jet Grout Device

Hae-Chan Lee; Ju-Yeol Bae; KI-IL Song; Geu-Guwen Yea; Ki-Pyo Jeon

doi:10.12814/jkgss.2025.24.1.059

All Issue

2025 Vol.24, Issue 1 Preview Page Next Page

Research Article

Optimal Wall Thickness Determination by Excavation Depth for Self-supporting Soil Retaining Walls Using a Vertical Vibrating Jet Grout Device 수직진동 제트 그라우팅 장치를 이용한 자립식 흙막이 벽체의 굴착 심도별 최적 벽체두께 산정

30 March 2025. pp. 59-68

PDF XML

Abstract

The VvJet grouting method, a type of rectangular jet grouting, has recently gained attention as it introduces vertical vibration during soil cutting and injection processes, addressing issues found in conventional high-pressure grouting techniques. However, research on the formation of stable, self-supporting retaining walls using this method remains insufficient. Therefore, this study evaluates the physical characteristics of the VvJet grouting method and analyzes the optimal wall thickness according to excavation depth. To achieve this, field soil investigations and field-scale test were conducted using the VvJet grouting method to form retaining walls. Additionally, core samples extracted from the formed walls and specimens designed to simulate real-scale conditions were tested. The tests included free-free resonance tests and uniaxial compression tests to assess the strength and physical properties of the constructed walls. Based on these results, numerical analysis was performed to determine the optimal wall thickness for different excavation depths, ensuring structural stability.

Keywords

VvJet grouting

Self-supporting Retaining wall

Field-scale test

Numerical analysis

사각 제트 그라우팅 공법 중 수직진동 제트 그라우팅 공법(Vertical vibrating Jet Grout, 이하 VvJet 그라우팅) 은 지반절삭 및 주입과정에서 수직진동을 도입하여 기존 고압 그라우팅 공법의 문제점을 해결할 수 있어, 최근 주목 받고 있는 공법이다. 그러나 이를 이용한 안정적인 자립식 흙막이 벽체 형성과 관련된 연구는 아직 부족하다. 따라서 본 연구에서는 VvJet 그라우팅 공법의 물리적 특성 평가와 굴착 심도에 따른 최적 벽체 두께를 분석하였다. 이를 위해 현장 지반조사와 VvJet 그라우팅 공법을 이용해 벽체를 형성하는 현장 시험을 수행하였다. 또한 형성된 벽체에서 채취된 코어와 실제 시공현장을 고려한 공시체를 제작하여 양단자유단 공진시험, 일축압축시험을 통해 실제 시공 시 벽체의 강도 및 물리적 특성을 평가하였다. 이를 기반으로 수치해석을 진행하여 안정적인 굴착 심도별 최적 벽체 두께를 산정하였다.

References

Bang, E. S., Park, S. G. and Kim, D. S. (2013), "Evaluating Shear Wave Velocity of Rock Specimen Through Compressional Wave Velocities Obtained from FFRC and Ultrasonic Velocity Methods", Geophysics and Geophysical Exploration, Vol.16, No.4, pp.250-256.

10.7582/GGE.2013.16.4.250

Gang, B. J., Hwang, B. S. and Cho, W. J. (2018), "Empirical estimations of soil constants using standard penetration test N value", Journal of the Korean GEO-environmental Society, Vol.19, No.6, pp.5-12.

Gwak, S. J. and Baek, H. R. (2005), "Square Jet Grouting to Reduce Permeability", In Proceedings of the Korean Geotechical Society Conference, pp.188-197.

Islam, T., Islam, M. A., Islam, M. S. and Abedin, M. Z. (2017), "Effect of fine content on shear strength behavior of sandy soil", In Proceedings of 14th Global Engineering and Technology Conference, BIAM Foundation,Vol.63.

Itasca Consulting Group, Inc. (2019), FLAC3D-Fast Lagrangian Analysis of Continua in 3 Dimensions, Version 6.0. User Manual, Minnesota, USA.

Kim, B. I., Hong, K. H., Kim, Y. S., Kim, J. H. and Han, S. J. (2023), "The Study on the Design and Numerical Analysis of Self-Supported Retaining Wall with Cement Treated Soil by Vertical Mixing Method (V-DCM)", Journal of the Korean Geosynthetics Society, Vol.22, No.1, pp.9-23.

Korean Standard Association. (2022), KS F 2314, Standard test method for unconfined compression test of soils.

KSCE Journal of Civil Engineering. (1996), Standard Specifications for Highway Bridges.

Ministry of Land, Infrastructure and Transport. (2021), KCS 11 10 15, Soil measurement during construction.

Ministry of Land, Infrastructure and Transport. (2022), KDS 21 30 00, Design criteria for temporary soil retaining walls.

Ministry of Land, Transport and Maritime Affairs. (2012), Road Design manual Part 7 Underpass, pp.703-731.

Seong, J. H. (2009). "The contiguity ground and structures sinkage analysis of in city excavation", In Proceedings of the Korean Geotechical Society Conference, pp.1301-1306.

Shin, E. C., Kwon, H. T., Park, J. J. and Son, C. H. (2005), "The Effect of Strength and Cut-off for the Ground Soil Improvement by Square Patterned Jet Grouting Techniqu", Journal of the Korean Geosynthetics Society, pp.3423-3426.

Sim, T. S. and Joo, S. E. (2000), "Mechanical properties of the ground improved by high pressure jet-grouting and analysis of deformation of propped retaining walls", Journal of the Korean Society of Agricultural Engineers, Vol.42, No.6, pp.98-105.

Yun, J. M., Hong, W. P. and Jeong, H. Y. (1996), "Case studies on ground improvement by high pressure jet grouting (II) Effect on the ground reinforcement and cut off of ground water behind temporary retaining walls", Geotechnical Engineering, Vol.12 No.5, pp.5-16.

Information

Publisher :Korean Geosythetics Society
Publisher(Ko) :한국지반신소재학회
Journal Title :Journal of the Korean Geosynthetics Society
Journal Title(Ko) :한국지반신소재학회 논문집
Volume : 24
No :1
Pages :59-68
Received Date : 2025-02-11
Revised Date : 2025-03-01
Accepted Date : 2025-03-04
DOI :https://doi.org/10.12814/jkgss.2025.24.1.059

Journal of the Korean Geosynthetics Society ISSN:2508-2876(Print) 2287-9528(Online) 한국지반신소재학회 논문집

All Issue