Experimental study on the pullout resistance of pressure-grouted soil nails in the field
Hong, Cheng-Yu1; Yin, Jian-Hua2; Pei, Hua-Fu2; Zhou, Wan-Huan3
Source PublicationCanadian Geotechnical Journal

The pullout behaviour of cement-grouted soil nails, particularly in field conditions, is not yet fully understood. In this study, a series of tests was conducted to evaluate the pullout response of grouted soil nails in a field slope. A new innovative grouting packer system was developed to control the grouted length and maintain the cement grout pressure of the grouted part. By using the grouting packer system, a total of 10 soil nails placed at different soil depths were grouted with different pressures in the field. The pullout results of present field tests and a number of past laboratory tests indicate that the apparent coefficient of friction (ACF) decreases with the increase of overburden stress even though grouting pressure is applied. In addition, when the overburden stress is unchanged, the obtained ACF values in the field tests appear to increase almost linearly with the increase of grouting pressure. After the soil nails were completely pulled out of the ground, the surfaces of the soil nails and surrounding soil were examined. It is found that the water content of the soil samples at the soil-nail interfaces decrease substantially compared to the water content of soil samples in drill holes. Measurement results also show that the failure surfaces of soil nails shifted about 16 mm on average into the surrounding soil due to the application of grouting pressure.

KeywordSoil Nail Cement Grout Pressure Apparent Coefficient Of Friction Overburden Stress
Indexed BySCI
WOS Research AreaEngineering ; Geology
WOS SubjectEngineering, Geological ; Geosciences, Multidisciplinary
WOS IDWOS:000321330100001
The Source to ArticleEngineering Village
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Cited Times [WOS]:30   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
Affiliation1.Department of Civil Engineering, Shantou University, Shantou, Guangdong, China;
2.Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;
3.University of Macau, Av. Padre Tomás Pereira, Taipa, Macau, China
Recommended Citation
GB/T 7714
Hong, Cheng-Yu,Yin, Jian-Hua,Pei, Hua-Fu,et al. Experimental study on the pullout resistance of pressure-grouted soil nails in the field[J]. Canadian Geotechnical Journal,2013,50(7):693-704.
APA Hong, Cheng-Yu,Yin, Jian-Hua,Pei, Hua-Fu,&Zhou, Wan-Huan.(2013).Experimental study on the pullout resistance of pressure-grouted soil nails in the field.Canadian Geotechnical Journal,50(7),693-704.
MLA Hong, Cheng-Yu,et al."Experimental study on the pullout resistance of pressure-grouted soil nails in the field".Canadian Geotechnical Journal 50.7(2013):693-704.
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