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2024 Vol.26, Issue 4 Preview Page

Research Paper

Numerical study on evaluation of grout diffusion range by the conditions of steel pipe reinforced grouting method

강관보강그라우팅 주입 조건에 따른 그라우트 확산 범위 평가에 관한 수치해석적 연구

Jun-Beom An1
,
Gye-Chun Cho2
,
Yuna Lee3
,
Jaewon Lee4*
,
Kyeongnam Min5
,
Gukje Jo6
안 준범1
,
조 계춘2
,
이 윤아3
,
이 재원4*
,
민 경남5
,
조 국제6
1Post-Doctoral Researcher, Applied Science Research Institute, KAIST
2Professor, Dept. of Civil and Environmental Engineering, KAIST
3Undergraduate Student, Dept. of Civil and Environmental Engineering, KAIST
4Vice President, Sejong E&T
5CEO, Sejong E&T
6Senior Manager, Environmental Business Dept., Sejong E&T
1정회원, 한국과학기술원 응용과학연구소 연수연구원
2정회원, 한국과학기술원 건설및환경공학과 교수
3비회원, 한국과학기술원 건설및환경공학과 학사과정
4정회원, 세종이엔티 부사장
5정회원, 세종이엔티 대표이사
6정회원, 세종이엔티 환경사업팀 과장
*Corresponding Author
31 July 2024. pp. 345-363
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Abstract

Steel pipe reinforced grouting method has been widely used to strengthen the crown of tunnel face and prevent groundwater leakage during tunnel excavation. Various injection procedures without sealing have recently been suggested to enhance efficiency. There are two representative injection methods. One is simultaneous injection in segmented batches, and the other is multiple injection using the external packer. The pros and cons of each method were discussed in terms of construction duration and equipment. However, it has yet to be discussed how the injection procedure affects the grout diffusion range in the ground. This study aims to evaluate the grout diffusion range quantitatively by considering the practical grouting sequences. The grout viscosity was measured by laboratory testing. Then, the numerical modeling was structured using the commercial computational fluid dynamics software. Finally, the grout diffusion range affected by the injection procedure and ground conditions was evaluated by performing the numerical parametric study. The results showed that the injection method highly affected the grout diffusion range, especially for inhomogeneous soil. Consequently, it is anticipated that the proper method of steel pipe reinforced grouting will be suggested.

Keywords
Steel pipe reinforced grouting
Permeation grouting
Grout injection procedure
Grout diffusion range
Numerical analysis

강관보강그라우팅 공법은 터널 시공 중 막장면 천단의 보강과 차수를 목적으로 시공현장에서 널리 적용되고 있다. 가장 보편적인 강관다단그라우팅 공법은 주입재의 역류를 막기 위해 강관과 보어홀 사이에 실링재를 주입하도록 규정되어 있으며 이 공정에서 긴 시간이 요구되는 실정이다. 따라서 실링 주입 공정을 제거한 강관보강그라우팅 공법이 여러 종류 제안되었으며, 대표적으로 구획을 나누어 동시에 주입하는 공법과 외부 패커를 활용해 다단으로 주입하는 공법이 있다. 시공 기간과 장비 면에서 이러한 대체 공법들의 장단점이 논의된 바 있으나 실제 지반에 각 주입 방법 별로 얼마나 주입 범위를 확보할 수 있는지에 대해서는 정량적으로 검토된 바가 없다. 따라서 본 연구에서는 실제 주입 공정에 기반하여 그라우트 주입 방법에 따른 주입 범위를 평가하고자 한다. 우선 그라우트의 점도를 실내 실험을 통해 계측하였다. 그리고 전산유체역학 상용 프로그램을 사용하여 수치해석 모델링을 구성하였다. 수치해석 모델링에 측정된 그라우트 물성과 현장에서의 주입 절차를 반영하여 매개변수 해석을 수행하였으며, 그 결과 주입 방식에 따라 주입 범위와 거동이 크게 달라지며 특히 비균질한 지반에서 더 두드러짐을 확인할 수 있었다. 본 연구에서 확인한 주입 방법과 지반 종류, 그리고 그라우트 종류에 따른 주입 범위를 기반으로 효과적인 주입공법의 선정에 기여할 수 있을 것으로 기대된다.

키워드
강관보강그라우팅
침투 그라우팅
그라우트 주입 공법
그라우트 주입 범위
수치해석
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Information
  • Publisher :Korean Tunneling and Underground Space Association
  • Publisher(Ko) :한국터널지하공간학회
  • Journal Title :Journal of Korean Tunnelling and Underground Space Association
  • Journal Title(Ko) :한국터널지하공간학회 논문집
  • Volume : 26
  • No :4
  • Pages :345-363
  • Received Date : 2024-06-21
  • Revised Date : 2024-07-17
  • Accepted Date : 2024-07-18
  • DOI :https://doi.org/10.9711/KTAJ.2024.26.4.345
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