Influence of Design Parameters of Grout Injection in Rock Mass using Numerical Analysis

Jong Won Lee; Hyung Mok Kim; Mahmoud Yazdani; Eui-Seob Park

doi:10.7474/TUS.2017.27.5.324

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2017 Vol.27, Issue 5 Preview Page Next Page

Research Article

Influence of Design Parameters of Grout Injection in Rock Mass using Numerical Analysis 암반 그라우팅 주입 설계변수가 주입성능에 미치는 영향의 수치해석적 평가

1 October 2017. pp. 324-332

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Abstract

In this paper, a numerical analysis of one-dimensional viscous fluid flow in a rock joint using UDEC code is performed to evaluate the effect of design parameters on injection performance. We consider injection pressure, fluid compressibility, time dependence of yield strength and viscosity of injected grout fluid, and mechanical deformation of joint as the design parameters, and penetration length and flow rate of injection are investigated as the injection performance. Numerical estimations of penetration length and flow rate were compared to analytical solution and were well comparable with each other. We showed that cumulative injection volume can be over-estimated by 1.2 times than the case that the time-dependent viscosity evolution is not considered. We also carried out a coupled fluid flow and mechanical deformation analysis and demonstrated that injection-induced joint opening may result in the increment of cumulative volume by 4.4 times of that from the flow only analysis in which joint aperture is kept constant.

Keywords

Viscous fluid flow

Grouting

UDEC

Injection performance

Penetration length

Injection rate

본 연구에서는 암반 절리 내 점성유체 주입시 주입 설계변수가 주입 성능에 미치는 영향을 평가할 목적으로 UDEC 프로그램을 사용하여 1차원 선형유동 해석을 수행하였다. 주입 설계변수로는 주입 압력, 유체 압축률, 주입재의 항복강도 및 점성도의 시간의존성, 주입 압력에 의한 절리의 역학적 변형을 설정하였으며, 주입재의 침투거리 및 주입 유량을 통해 주입 성능을 평가하였다. 수치해석 결과는 이론해를 통하여 파악한 주입 성능 양상과 유사한 결과를 보였다. 주입재의 항복강도 및 점성도의 시간의존성을 고려하지 않을 경우, 주입재의 누적 주입량은 시간의존성을 고려한 해석에 비하여 약 1.2배 크게 평가되었다. 또한, 수리-역학 연계해석결과로부터 주입 압력에 의한 절리의 역학적 변형이 발생하는 경우, 절리 간극이 일정한 수리유동 해석에 비하여 누적 주입량이 약 4.4배 늘어나는 결과를 보였다.

키워드

점성유체유동

그라우팅

UDEC

주입 성능

침투거리

주입 유량

References

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Information

Publisher :Korean Society for Rock Mechanics and Rock Engineering
Publisher(Ko) :한국암반공학회
Journal Title :Tunnel and Underground Space
Journal Title(Ko) :터널과 지하공간
Volume : 27
No :5
Pages :324-332
Received Date : 2017-10-13
Revised Date : 2017-10-19
Accepted Date : 2017-10-19
DOI :https://doi.org/10.7474/TUS.2017.27.5.324

Tunnel and Underground SpaceISSN:1225-1275(Print) 2287-1748(Online)한국암반공학회

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