Cargando…

Experimental Study of Split Grouting Reinforcement Mechanism in Filling Medium and Effect Evaluation

In view of the deficiency of the split grouting theory for the filling area, a 3D simulated grouting test system was designed to explore the slurry diffusion law, reinforcement mechanism of split grouting in a filling soil, and effect of grouting reinforcement. The test system included an experiment...

Descripción completa

Detalles Bibliográficos
Autores principales: Niu, Jiandong, Li, Zewei, Gu, Weiheng, Chen, Kang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7308942/
https://www.ncbi.nlm.nih.gov/pubmed/32486072
http://dx.doi.org/10.3390/s20113088
_version_ 1783549109376909312
author Niu, Jiandong
Li, Zewei
Gu, Weiheng
Chen, Kang
author_facet Niu, Jiandong
Li, Zewei
Gu, Weiheng
Chen, Kang
author_sort Niu, Jiandong
collection PubMed
description In view of the deficiency of the split grouting theory for the filling area, a 3D simulated grouting test system was designed to explore the slurry diffusion law, reinforcement mechanism of split grouting in a filling soil, and effect of grouting reinforcement. The test system included an experiment bench system, grouting system, and information monitoring system, using which experimental research on split grouting in a filling soil was conducted. The grouting model experiment procedure was introduced first, following which the diffusion rule of slurry in the filling medium and the reinforcement mechanism of split grouting were analyzed according to the properties and distribution characteristics of grouting veins after grouting reinforcement. Finally, a uniaxial compression test, light dynamic contact test, permeability test, and laboratory geotechnical test were conducted on the soil before and after grouting. The relationship between the zoning characteristics of different properties of veins and the mechanical properties of filling soil were discussed. The results showed that there were three types of grouting veins: trunk grouting, branch grouting, and permeable grouting. The injected soil body was strengthened by the three-stage grouting vein network of the mentioned vein types and the compaction between soils. After the grouting, the uniaxial compressive strength of the filling soil increased by an average of 186%, and the permeability coefficient decreased by an average of 47 times. The cohesion and internal friction angle increased by 45.3% and 44.9%, respectively. Additionally, density, water content, and other indicators of filling were improved. The bearing characteristics reflected by a dynamic contact test were consistent with the distribution of grouting veins. The research results offer significant guidance for the reinforcement mechanism of split grouting and the evaluation of the grouting effect.
format Online
Article
Text
id pubmed-7308942
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-73089422020-06-25 Experimental Study of Split Grouting Reinforcement Mechanism in Filling Medium and Effect Evaluation Niu, Jiandong Li, Zewei Gu, Weiheng Chen, Kang Sensors (Basel) Article In view of the deficiency of the split grouting theory for the filling area, a 3D simulated grouting test system was designed to explore the slurry diffusion law, reinforcement mechanism of split grouting in a filling soil, and effect of grouting reinforcement. The test system included an experiment bench system, grouting system, and information monitoring system, using which experimental research on split grouting in a filling soil was conducted. The grouting model experiment procedure was introduced first, following which the diffusion rule of slurry in the filling medium and the reinforcement mechanism of split grouting were analyzed according to the properties and distribution characteristics of grouting veins after grouting reinforcement. Finally, a uniaxial compression test, light dynamic contact test, permeability test, and laboratory geotechnical test were conducted on the soil before and after grouting. The relationship between the zoning characteristics of different properties of veins and the mechanical properties of filling soil were discussed. The results showed that there were three types of grouting veins: trunk grouting, branch grouting, and permeable grouting. The injected soil body was strengthened by the three-stage grouting vein network of the mentioned vein types and the compaction between soils. After the grouting, the uniaxial compressive strength of the filling soil increased by an average of 186%, and the permeability coefficient decreased by an average of 47 times. The cohesion and internal friction angle increased by 45.3% and 44.9%, respectively. Additionally, density, water content, and other indicators of filling were improved. The bearing characteristics reflected by a dynamic contact test were consistent with the distribution of grouting veins. The research results offer significant guidance for the reinforcement mechanism of split grouting and the evaluation of the grouting effect. MDPI 2020-05-29 /pmc/articles/PMC7308942/ /pubmed/32486072 http://dx.doi.org/10.3390/s20113088 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Niu, Jiandong
Li, Zewei
Gu, Weiheng
Chen, Kang
Experimental Study of Split Grouting Reinforcement Mechanism in Filling Medium and Effect Evaluation
title Experimental Study of Split Grouting Reinforcement Mechanism in Filling Medium and Effect Evaluation
title_full Experimental Study of Split Grouting Reinforcement Mechanism in Filling Medium and Effect Evaluation
title_fullStr Experimental Study of Split Grouting Reinforcement Mechanism in Filling Medium and Effect Evaluation
title_full_unstemmed Experimental Study of Split Grouting Reinforcement Mechanism in Filling Medium and Effect Evaluation
title_short Experimental Study of Split Grouting Reinforcement Mechanism in Filling Medium and Effect Evaluation
title_sort experimental study of split grouting reinforcement mechanism in filling medium and effect evaluation
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7308942/
https://www.ncbi.nlm.nih.gov/pubmed/32486072
http://dx.doi.org/10.3390/s20113088
work_keys_str_mv AT niujiandong experimentalstudyofsplitgroutingreinforcementmechanisminfillingmediumandeffectevaluation
AT lizewei experimentalstudyofsplitgroutingreinforcementmechanisminfillingmediumandeffectevaluation
AT guweiheng experimentalstudyofsplitgroutingreinforcementmechanisminfillingmediumandeffectevaluation
AT chenkang experimentalstudyofsplitgroutingreinforcementmechanisminfillingmediumandeffectevaluation