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A platform for research: civil engineering, architecture and urbanism
CFD-DEM modeling of geotextile clogging in tunnel drainage systems
https://orcid.org/0000-0001-9653-9673
Abstract In this study, a coupled Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) method we used to investigate the hydraulic deterioration of a geotextile due to clogging in tunnel drainage systems. Initially, a framework was developed to generate and test a numerical representation of a typical non-woven geotextile. Following model validation, we carried out parametric analysis to examine the effect of fine content, crack angle, and groundwater inflow. The results showed a general trend of pressure increase associated with increasing both the crack angle and fine content. This increase was found to decay at larger crack angles and high content of fines. Interestingly, increasing groundwater inflow was found to had minimal effect on the final deposition of the clogging particles. Finally, an approximate semi-analytical model was developed to describe the pressure increase due to clogging. The model was able to provide a good match with the data obtained from the numerical analysis.
Highlights A novel framework for numerically creating and testing non-woven geotextiles. Microscale analysis of geotextile clogging using CFD-DEM. Different dynamics besides clogging such as piping are captured. High ingress into the tunnel has limited effect on final clogging patterns. A semi-analytical model to describe pressure increase due to clogging is developed.
CFD-DEM modeling of geotextile clogging in tunnel drainage systems
https://orcid.org/0000-0001-9653-9673
Abstract In this study, a coupled Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) method we used to investigate the hydraulic deterioration of a geotextile due to clogging in tunnel drainage systems. Initially, a framework was developed to generate and test a numerical representation of a typical non-woven geotextile. Following model validation, we carried out parametric analysis to examine the effect of fine content, crack angle, and groundwater inflow. The results showed a general trend of pressure increase associated with increasing both the crack angle and fine content. This increase was found to decay at larger crack angles and high content of fines. Interestingly, increasing groundwater inflow was found to had minimal effect on the final deposition of the clogging particles. Finally, an approximate semi-analytical model was developed to describe the pressure increase due to clogging. The model was able to provide a good match with the data obtained from the numerical analysis.
Highlights A novel framework for numerically creating and testing non-woven geotextiles. Microscale analysis of geotextile clogging using CFD-DEM. Different dynamics besides clogging such as piping are captured. High ingress into the tunnel has limited effect on final clogging patterns. A semi-analytical model to describe pressure increase due to clogging is developed.
CFD-DEM modeling of geotextile clogging in tunnel drainage systems
https://orcid.org/0000-0001-9653-9673
Abstract In this study, a coupled Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) method we used to investigate the hydraulic deterioration of a geotextile due to clogging in tunnel drainage systems. Initially, a framework was developed to generate and test a numerical representation of a typical non-woven geotextile. Following model validation, we carried out parametric analysis to examine the effect of fine content, crack angle, and groundwater inflow. The results showed a general trend of pressure increase associated with increasing both the crack angle and fine content. This increase was found to decay at larger crack angles and high content of fines. Interestingly, increasing groundwater inflow was found to had minimal effect on the final deposition of the clogging particles. Finally, an approximate semi-analytical model was developed to describe the pressure increase due to clogging. The model was able to provide a good match with the data obtained from the numerical analysis.
Highlights A novel framework for numerically creating and testing non-woven geotextiles. Microscale analysis of geotextile clogging using CFD-DEM. Different dynamics besides clogging such as piping are captured. High ingress into the tunnel has limited effect on final clogging patterns. A semi-analytical model to describe pressure increase due to clogging is developed.
CFD-DEM modeling of geotextile clogging in tunnel drainage systems
Ibrahim, Ahmed (author) / Meguid, Mohamed A. (author)
Geotextiles and Geomembranes ; 50 ; 932-945
2022-06-01
14 pages
Article (Journal)
Electronic Resource
English
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