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2019 Vol.29, Issue 3

Research Article

A Study on the Grouting Characteristics of Top-down Multi-step Pressure Grouting Method

하향식 다단 압력 그라우팅 방법의 주입특성에 대한 연구

Hongsung Lee1*
,
Seungho Lee2
이 홍성1*
,
이 승호2
1Director of Engineering Business Headquarters, Hanto E&C Corporation
2Professor, Department of Civil Engineering, Sangji University
1(주)한토 이엔씨 엔지니어링 사업본부 이사
2상지대학교 토목공학과 교수
*Corresponding Author
30 September 2019. pp. 201-209
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Abstract

Bottom-up multi-stage pressure grouting is widely applied to domestic slopes and tunnels. It involves injecting earth from the ground to the surface after drilling. Various reports of construction performance have demonstrated its wide applicability. However, little research has studied top-down multi-step pressure grouting in Korea, which involves injection from the surface. This paper compares the grouting effect of both the established bottom-up method and the top-down method in soil box and field tests. The soil box test showed that the bulb volume of the top-down method is ~24% less than that of the bottom-up method. The field test confirmed that the top-down method has a wider grouting range and a higher injection density per area than the bottom-up method.

Keywords
top-down multi-step pressure grouting method
soil box test
grout bulbed volume
grouting range
injection density

국내 사면 및 터널에서 주로 적용되고 있는 다단 압력을 이용한 그라우팅 방법들은 천공 후 지중에서 지표 방향으로 스텝주입을 하는 상향식 다단압력 그라우팅 방법이며 다수의 연구결과와 축척된 시공실적을 토대로 현재 여러 현장에서 적용되고 있다. 국내에서 하향식 다단압력 그라우팅 방법의 연구결과는 미미한 실정이다. 본 논문에서는 토조시험과 현장시험을 통해 기존 상향식 다단압력 그라우팅 방법과 지표부에서부터 주입을 실시하는 하향식 다단압력 그라우팅 방법의 주입효과를 비교․분석하였다. 토조 시험 결과 하향식 다단압력 그라우팅 방법의 경우 상향식 다단압력 그라우팅 방법에 비해 구근체의 부피는 약 24% 증가하는 것으로 나타났다. 현장시험 결과 하향식 다단 압력 그라우팅 방법이 상향식 다단 압력 그라우팅 방법에 비해 주입 범위가 넓고 면적당 주입 밀집도가 높은 것으로 확인되었다.

키워드
하향식 다단 압력 그라우팅 방법
토조시험
구근체 부피
주입범위
주입 밀집도
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 29
  • No :3
  • Pages :201-209
  • Received Date : 2019-07-31
  • Revised Date : 2019-08-19
  • Accepted Date : 2019-08-19
  • DOI :https://doi.org/10.9720/kseg.2019.3.201
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