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Groundwater-mud control and safety thickness of curtain grouting for the Junchang Tunnel: A case study
Jin-Quan Liu1,2; Wei-Zhong Chen3; Ka-Veng Yuen1; Xiao-Sheng Zhou4
Source PublicationTunnelling and Underground Space Technology

The Junchang tunnel is a part of a major project in the Censhui highway in Guangxi province, China. The weathered granite part of the tunnel is approximately 180 m long with two lines and four lanes. Numerous water and mud inrush disasters frequently occurred in the weathered granite area, leading to serious economic loss and challenge to the constructors. Therefore, continuous grouting was carried out for the entire weathered part of the tunnel. This paper describes its curtain grouting for disasters prevention. Detailed discussion is presented on the safety thickness after grouting and the challenges encountered under different hydraulic-geological conditions. Specifically, a water and mud inrush model for the nonlinear flow and mass transfer behavior of weathered granite was used to evaluate the safety thickness in this project. Then, field studies with twenty-five grouting cycles and excavations were conducted to investigate the effective safety thickness. Negative correlation was observed between the safety thickness and the rock classification index [BQ]. Numerical simulation and field tests demonstrated that the thickness l should be larger than 3 m, and, in most cases, 5 m was sufficient when [BQ] < 72.5. When [BQ] ≥ 72.5, l should be between 1.5 m and 3 m. Based on the field data, an empirical formula was developed to determine the thickness under different values of [BQ]. The research findings serve as an important reference for future projects in similar stratum.

KeywordGroundwater Control Weathered Granite Ground Condition Safety Thickness Field Investigation
URLView the original
Indexed BySCIE
WOS Research AreaConstruction & Building Technology ; Engineering
WOS SubjectConstruction & Building Technology ; Engineering, Civil
WOS IDWOS:000556245300003
Scopus ID2-s2.0-85086585971
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Cited Times [WOS]:15   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionFaculty of Science and Technology
Corresponding AuthorKa-Veng Yuen
Affiliation1.State Key Laboratory on Internet of Things for Smart City and Department of Civil and Environmental Engineering,University of Macau,Macau,China
2.Quanzhou Institute of Equipment Manufacturing,Haixi Institutes,Chinese Academy of Sciences,Quanzhou,362000,China
3.State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,430071,China
4.Guangxi Xinda Highway Co.,Ltd,Nanning,530021,China
First Author AffilicationUniversity of Macau
Corresponding Author AffilicationUniversity of Macau
Recommended Citation
GB/T 7714
Jin-Quan Liu,Wei-Zhong Chen,Ka-Veng Yuen,et al. Groundwater-mud control and safety thickness of curtain grouting for the Junchang Tunnel: A case study[J]. Tunnelling and Underground Space Technology,2020,103.
APA Jin-Quan Liu,Wei-Zhong Chen,Ka-Veng Yuen,&Xiao-Sheng Zhou.(2020).Groundwater-mud control and safety thickness of curtain grouting for the Junchang Tunnel: A case study.Tunnelling and Underground Space Technology,103.
MLA Jin-Quan Liu,et al."Groundwater-mud control and safety thickness of curtain grouting for the Junchang Tunnel: A case study".Tunnelling and Underground Space Technology 103(2020).
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