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Curtain grouting experiment in a dam foundation: case study with the main focus on the Lugeon and grout take tests
Dou, Jinxi1,2,4; Zhang, Guijin1,2; Zhou, Mengxia3; Wang, Zhilin3; Gyatso, Ngawang3; Jiang, Mingqiang4; Safari, Pooya5; Liu, Jinquan5,6
2020-11-01
Source PublicationBulletin of Engineering Geology and the Environment
ISSN1435-9529
Volume79Issue:9Pages:4527-4547
Abstract

The Baihetan super-high arch dam is constructed under complicated geological conditions, including large-scale columnar jointed basalt (CJB) with closely spaced joints and multiple interlayer and intralayer shear belts at the lower part of dam base, which may increase a risk of seepage in adjacent dam foundations. Therefore, curtain grouting is used to reduce the permeability of dam foundations. Lugeon and grouting field tests and geological exploration were carried out to investigate curtain grouting characteristics of the dam foundation. The findings were as follows: (1) the permeability coefficient of the first type of CJB and breccia lava without unloading is 2 × 10 ~ 5 × 10 cm/s; that of the second type of CJB without unloading is 2.5 × 10 ~ 5 × 10 cm/s; and that of the unloaded third type of massive basalt is 1 × 10 ~ 3 × 10 cm/s. (2) The rock core shows that the slurry caused repeated splitting of the rock mass and widened the cracks of the rock mass, which resulted in plastic deformation of the rock mass. The P ~ Q curve of the five-point Lugeon test shows that the curve shape is turbulent and that the maximum Lugeon value appears at the highest pressure. (3) The phenomenon of low-permeability conditions with a large grout take can be frequently observed. The proportion of the hole stages with a water permeability less than 1 LU and grout take greater than 50 kg/m ranges from 12.5 to 37.5%. The proportion of holes with permeability greater than 10 Lu and grout take greater than 50 kg/m is 0 to 12.5%. The findings from this case study can provide a reference for engineering construction.

KeywordCase Study Columnar Joints Curtain Grouting Grout Take Lugeon Values
DOI10.1007/s10064-020-01865-0
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaEngineering ; Geology
WOS SubjectEngineering, Environmental ; Engineering, Geological ; Geosciences, Multidisciplinary
WOS IDWOS:000539202500002
Scopus ID2-s2.0-85086152484
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Cited Times [WOS]:3   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Corresponding AuthorLiu, Jinquan
Affiliation1.School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha, 410114, China
2.Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha, 410114, China
3.China Three Gorges Projects Development Co., Ltd, Chengdu, 610000, China
4.Sinohydro Bureau 8 Co., Ltd, Changsha, 410114, China
5.Quanzhou Institute of Equipment Manufacturing, Haixi Institutes, Chinese Academy of Sciences, Quanzhou, 362000, China
6.University of Macau, 999078, Macao
Corresponding Author AffilicationUniversity of Macau
Recommended Citation
GB/T 7714
Dou, Jinxi,Zhang, Guijin,Zhou, Mengxia,et al. Curtain grouting experiment in a dam foundation: case study with the main focus on the Lugeon and grout take tests[J]. Bulletin of Engineering Geology and the Environment,2020,79(9):4527-4547.
APA Dou, Jinxi,Zhang, Guijin,Zhou, Mengxia,Wang, Zhilin,Gyatso, Ngawang,Jiang, Mingqiang,Safari, Pooya,&Liu, Jinquan.(2020).Curtain grouting experiment in a dam foundation: case study with the main focus on the Lugeon and grout take tests.Bulletin of Engineering Geology and the Environment,79(9),4527-4547.
MLA Dou, Jinxi,et al."Curtain grouting experiment in a dam foundation: case study with the main focus on the Lugeon and grout take tests".Bulletin of Engineering Geology and the Environment 79.9(2020):4527-4547.
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