An investigation of the effects of important grouting and rock parameters on the grouting process

Ali Mortazavi, Abbas Maadikhah

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

ABSTRACT: Today, grouting is used as an aid in ground improvement in most civil and mining engineering projects. Groutability and grout penetration depth are among the most important issues that are considered in grouting operation. Various parameters such as in-situ stress, pore water pressure, joint geometric and geomechanical characteristics, grout properties (viscosity and yield stress) and technical factors such as grouting pressure and flow rate affect the groutability and grout penetration depth in a jointed rock mass. Knowledge of the effect of these parameters has advantages in the prediction of grouting results. Typically, cement-based grout is used in jointed rock masses. Unlike water, stable cement-based grout usually acts as a Bingham fluid. In this study the effect of important parameters on grouting process in a jointed rock mass was investigated numerically using the DEM method. In the conducted study, the problem geometry represents a horizontal section in a regularly jointed rock mass with two joint sets. The analyses results show that the grout penetration depth and intake increase as joint aperture, normal stiffness and grouting pressure increase and in-situ stress and pore water pressure decrease. Increase in joint spacing does not have any effect on the grout penetration depth but decreases the grout intake. The effect of joint orientation on grouting process is strongly dependent on in-situ stress state. On the other hand, increase in grout yield stress decreases the grout penetration depth and intake, while grout viscosity does not have any effect on maximum grout penetration depth and intake. To further investigate the above mechanisms, the grouting process conducted in Gotvand dam-Iran was simulated numerically.

Original languageEnglish
Pages (from-to)219-235
Number of pages17
JournalGeomechanics and Geoengineering
Volume11
Issue number3
DOIs
Publication statusPublished - Jul 2 2016
Externally publishedYes

Keywords

  • grout penetration
  • grout rheology
  • grouting
  • jointed rock masses
  • Numerical analysis

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

Fingerprint Dive into the research topics of 'An investigation of the effects of important grouting and rock parameters on the grouting process'. Together they form a unique fingerprint.

Cite this