Numerical analyses using CFD on the pressure losses of the grout flow with variation of joint roughness and grout features

Myung Sagong; Sung-ha Ryu

doi:10.9711/KTAJ.2018.20.6.989

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2018 Vol.20, Issue 6 Preview Page Next Page

Research Paper

Numerical analyses using CFD on the pressure losses of the grout flow with variation of joint roughness and grout features 전산유동역학을 이용한 절리 거칠기 및 주입재 특성에 따른 그라우트 주입 시 압력 손실 해석

30 November 2018. pp. 989-1002

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Abstract

Grouting for the rock joint is to strengthen the rock strata by infiltrating cement grout materials into the rock joints. Grouting is one of a field of study which is difficult to develop deterministic and quantitative design approach because of multiphase behaviors of grout materials and 3 dimensional features of rock joints. Therefore, GIN (Grouting Intensity Number) can be a good index with appropriate monitoring of pressure and volume of grout. In this paper, we investigate the effects of joint roughness (JRC) and rheology of cement material during the infiltration of cement grout material into rock joint through CFD (computational fluid dynamics) analyses. With rough joint surface and increase of WC ratio, the frictional resistance during the grouting increases. The results have been summarized with polynomial correlations.

Keywords

Grouting

GIN

Rock joint

CFD analyses

암반 내 그라우팅은 불연속면 내부에 시멘트 그라우트재를 주입하여 주변지반을 강화하는 목적으로 사용된다. 현장에서 다상의 그라우트재의 주입 시 거동특성 및 주입경로인 3차원 절리면의 형태가 사전파악되지 않으므로 정량적인 설계가 어려운 분야중 하나이다. 따라서 현장에서의 그라우트 주입 거동특성을 나타내는 GIN (Grouting Intensity Number) 지표를 이용하여 주입모니터링을 통해 적절한 시공관리를 수행하는 것이 최적이 방안이다. 본 논문에서는 그라우팅 주입 시 절리면의 거칠기 등급과 물시멘트(W/C)비에 따라 발생하는 압력의 손실을 전산유동해석을 수행하여 조사하였다. 절리면이 거칠수록 그리고 물시멘트비가 높을수록 주입 시 마찰저항은 크게 발생하였으며 해당 결과를 각 조건별 상관식으로 정리하였다.

키워드

그라우팅

GIN

암반절리

전산유동해석

References

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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 : 20
No :6
Pages :989-1002
Received Date : 2018-08-23
Revised Date : 2018-10-04
Accepted Date : 2018-10-17
DOI :https://doi.org/10.9711/KTAJ.2018.20.6.989

Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

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