3D CFD-DEM modeling for clogging process of cement-based grout

Hiroyuki Shimizu, T. Koyama

研究成果: Conference contribution

抄録

Grouting is a widely used method for sealing fractured rock masses around underground structures to reduce or stop groundwater inflow. One important aspect is the grout penetrability. However, the clogging and penetration mechanism of cement-based grout have not been clarified sufficiently yet due to complicated physical and chemical processes of grout, such as pressure-dehydration, consolidation, bleeding, clogging, absorption, sedimentation and condensation etc. Therefore, design and construction of grout injection depends on the experience of field technicians. Based on this situation, authors had developed a 2D numerical model of coupled Computational Fluid Dynamics and the Distinct Element Method (CFD-DEM), and simulate a laboratory scale grout injection experiment to better understand the penetration and clogging mechanism of cement-based grout. However, the results have raised some problems in this 2D approach. The flow of fluid and particles in the depth direction can not be represented in the two-dimensional simulation. Then, the simulated grout injection completely stopped instantaneously when particles formed an arch structure and clogging occurs. In actual grout injection test, the amount of cement that flows out from the outlet is reduced gradually and clogging occurs as a result. 3D simulations are essential in order to accurately reproduce the above experimental results. This paper presents 3D CFD-DEM simulations for the laboratory grout injection test (called "short slot" experiment) performed in Royal Institute of Technology (KTH) in Sweden. The simulation results agree qualitatively well with the actual experimental results, and the clogging process during the injection of cement-based grout was successfully reproduced by the 3D CFD-DEM code. The presented numerical model in this paper gives a better understanding for clogging and penetration mechanism of cement-based grout.

本文言語English
ホスト出版物のタイトルISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014
編集者 Kaneko, Kodama, Shimizu
出版社International Society for Rock Mechanics
ページ1932-1938
ページ数7
ISBN(電子版)9784907430030
出版ステータスPublished - 2014 1月 1
イベント8th Asian Rock Mechanics Symposium, ARMS 2014 - Sapporo, Japan
継続期間: 2014 10月 142014 10月 16

出版物シリーズ

名前ISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014

Other

Other8th Asian Rock Mechanics Symposium, ARMS 2014
国/地域Japan
CitySapporo
Period14/10/1414/10/16

ASJC Scopus subject areas

  • 地球物理学
  • 地球化学および岩石学

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