Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Modeling of rock grouting in saturated variable aperture fractures
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Resources, Energy and Infrastructure.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics.
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Resources, Energy and Infrastructure.
2018 (English)In: Proceedings of Bergdagarna 2018., 2018, p. 79-87, article id 10Conference paper, Published paper (Refereed)
Abstract [en]

Modeling and analysis of cement grouts flow in rock fractures is important in the design, execution and monitoring of grouting in fractured rocks. At present, modeling of rock grouting mainly relies on analytical models, e.g., the real time grouting control (RTGC) method. In the RTGC method, it is assumed that the rock fractures are consisting of smooth parallel plates or disks and water flow is neglected. However, in reality, the natural rock fractures are commonly consisting of complex rough-walled surfaces and are filled with groundwater; therefore, grouting is actually a multiphase (non-Newtonian grouts and groundwater) flow process in rough-walled rock fractures with variable apertures. In this study, we present an efficient one-dimensional (1D) numerical model for modeling of rock grouting in a single rock fracture with consideration of multiphase flow and variable apertures. It is assumed that the cement grouts are Bingham fluids and that the analytical solution for flowrate with a given pressure gradient in a pair of smooth parallel plates is locally applicable. A time-dependent advection equation is used to describe the interface (between the grout and groundwater) propagation. A finite element method (FEM) code is developed to iteratively solve the mass balance and the interface advection equations. The numerical simulations are compared with the RTGC method. It generally shows that water flow significantly affect grouts penetration in the fracture, especially for the grouts with relatively lower viscosity. The variable aperture significantly postpones the penetration process compared with that of constant aperture. This numerical model is able to describe more realistic physical processes and geometry conditions in rock grouting, which can be readily used in practice to reduce the potential uncertainties in application of simplified analytical models.

Abstract [sv]

Modellering och analys av cementbaserade injekteringsmedels strömning är viktiga hjälpmedel för design, utförande och uppföljning av injektering i sprickigt berg. Dagens modeller är ofta baserade på förenklade analytiska lösningar, exempelvis de som ingår i ”Real time grouting control (RTGC)” metoden. För att analytiska lösningar skall kunna användas, antas att sprickorna utgörs av släta, plan-parallella skivor och att dessa inte innehåller något vatten. I verkligheten är dock sprickorna råa, vattenfyllda och med komplexa geometrier, vilket medför att cementinjektering i sprickigt berg i strikt mening är en multi-fas process i en varierande geometri. I föreliggande studie, presenteras en en-dimesionell numerisk model för injektering i en enskild spricka, under beaktande av multi-fas strömning med varierande spricköppning. En tidsberoende advektionsfunktion används för att beskriva gränsskiktet mellan injekteringsmedel och vatten och dess förflyttning med tiden. Resultaten visar på en betydande påverkan från sprickornas vatteninnehåll, dels på tryckfördelningen men även på injekteringsmedlets inträngning i sprickorna, särskilt vid låg viskositet. Den varierande spricköppningen gör också att inträngningen blir långsammare i förhållande till fallet med en konstant spricköppning, vilket är förväntat. Den numeriska modellen beskriver förhållandena på ett mer realistiskt sätt, både ur fysikalisk och geometrisk synvinkel, vilket kan utnyttjas i praktiken för att reducera potentiella osäkerheter vid användandet av dagens analytiska metoder.

Place, publisher, year, edition, pages
2018. p. 79-87, article id 10
National Category
Infrastructure Engineering
Research subject
Civil and Architectural Engineering
Identifiers
URN: urn:nbn:se:kth:diva-226885OAI: oai:DiVA.org:kth-226885DiVA, id: diva2:1201782
Conference
Bergdagarna 2018
Funder
Rock Engineering Research Foundation (BeFo)
Note

QC 20180515

Available from: 2018-04-26 Created: 2018-04-26 Last updated: 2018-05-15Bibliographically approved

Open Access in DiVA

Modeling of rock grouting in saturated variable aperture fractures(452 kB)15 downloads
File information
File name FULLTEXT01.pdfFile size 452 kBChecksum SHA-512
38877c25f8b995e0e776031aa156888640ee68b8f8e7bc7daa62ddea2881b5f92504de24c4440135c61a9b8b4de3f8da5a7658abd2cc4040520e8961304f95c5
Type fulltextMimetype application/pdf

Authority records BETA

Zou, LiangchaoHåkansson, UlfCvetkovic, Vladimir

Search in DiVA

By author/editor
Zou, LiangchaoHåkansson, UlfCvetkovic, Vladimir
By organisation
Resources, Energy and InfrastructureSoil and Rock Mechanics
Infrastructure Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 15 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 95 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf