Geomechanics and Engineering

Techno-Press (테크노프레스)
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Change of groundwater inflow by cutoff grouting thickness and permeability coefficient

  • Kim, Youngsang (Department of Civil Engineering, Chonnam National University) ;
  • Moon, Joon-Shik (Department of Civil Engineering, Kyungpook National University)
  • Received : 2019.12.04
  • Accepted : 2020.03.03
  • Published : 2020.04.25
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Abstract

The groundwater during tunnel excavation not only affects the stability of the tunnel and constructability but also causes the subsidence of the upper ground due to the lowering of groundwater. Generally, the cutoff grouting is applied as a countermeasure to reduce the groundwater inflow during tunnel excavation, and the cutoff grouting is often applied in the range of plastic zone around the tunnel. However, grouting in the plastic zone is only appropriate for ground reinforcement purposes, and guidelines for the application range of cutoff grouting and the targeted permeability coefficient of the grouting zone are required. In this study, the relationship between groundwater inflow into tunnel and application range of cutoff grouting and permeability coefficient is proposed and compared with numerical analysis results. It was found that grouting with tunnel radius thickness is appropriate to reduce the groundwater inflows effectively. More than 90% reduction in groundwater inflow can be achieved when the annular area of the tunnel radius thickness is grouted with a permeability reduction ratio of 1/50~1/200.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF2016R1D1A3B03934477).

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Cited by

  1. Grouting Design of Rich Water Tunnels and the Calculation of Distance between Annular Blind Pipes vol.2020, 2020, https://doi.org/10.1155/2020/8873971