Comparative study on pullout behaviour of pressure grouted soil nails from field and laboratory tests

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• 作者：Cheng-yu Hong (11735)
  Jian-hua Yin (21735)
  Hua-fu Pei (21735)
  
• 关键词：soil nail ; apparent coefficient of friction ; overburden soil pressure ; grouting pressure
• 刊名：Journal of Central South University
• 出版年：2013
• 出版时间：August 2013
• 年：2013
• 卷：20
• 期：8
• 页码：2285-2292
• 全文大小：1049KB
• 参考文献：1. LEE C F, LAW K T, THAM L G, YUE Z Q, JUNAIDEEN S M. Design of a large soil box for studying soil-nail interaction in loose fill [C]// Soft Soil Engineering: Proceedings of the Third International Conference on Soft Soil Engineering. Hong Kong, 2001: 413-18
  2. LUO S Q, TAN S A, YONG K Y. Pull-out resistance mechanism of a soil nail reinforcement in dilative soils [J]. Soils and Foundations, 2000, 40(1): 47-6. CrossRef
  3. MILLIGAN G W E, TEI K. The pull-out resistance of model soil nails [J]. Journal of Soils and Foundations, 1998, 38(2): 179-90. CrossRef
  4. PRADHAN B. Study of pullout behaviour of soil nails in completely decomposed granite fill [D]. Hong Kong, China: The University of Hong Kong, 2003.
  5. PRADHAN B, THAM L, YUE Z, JUNAIDEEN S, LEE C. Soil-nail pullout interaction in loose fill materials [J]. International Journal of Geomechanics, 2006, 6: 238. CrossRef
  6. SU L J, CHAN T C F, YIN J H, SHIU Y K, CHIU S L. Influence of overburden pressure on soil-nail pullout resistance in a compacted fill [J]. Journal of Geotechnical and Geoenvironmental Engineering, 2008, 134(9): 1339-347. CrossRef
  7. YIN J H, ZHOU W H. Influence of grouting pressure and overburden soili pressure on the interface resistance of a soil nail [J]. Journal of Geotechnical and Geoenvironmental Engineering, 2009, 135(9): 1198-208. CrossRef
  8. WEATHERBY D E. Tiebacks [R]. Washington D.C: Federal Highway Administration, 1982.
  9. CHU L M, YIN J H. Comparison of interface shear strength of soil nails measured by both direct shear box tests and pullout tests [J]. Journal of Geotechnical and Geoenvironmental Engineering, 2005, 131(9): 1097-107. CrossRef
  10. YIN J H, SU L J, CHEUNG R W M, SHIU Y K, TANG C. The influence of grouting pressure on the pullout resistance of soil nails in compacted completely decomposed granite fill [J]. Geotechnique, 2009, 59(2): 103-13. CrossRef
  11. ZHANG L L, ZHANG L M, TANG W H. Uncertainties of field pullout resistance of soil nails [J]. Journal of Geotechnical and Geoenvironmental Engineering, 2009, 135(7): 966-72. CrossRef
  12. ZHOU W H. Experimental and theoretical study on pullout resistance of grouted soil nails [D]. Hong Kong, China: Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, 2008.
  13. SHIELDS D R, SCHNABEL H, WEATHERBY D E. Load-Transfer in pressure injected anchors [J]. Journal of the Geotechnical Engineering Division, ASCE, 1978, 104(9): 1183-196.
  14. ELIAS V, JURAN I. Soil nailing for stabilization of highway slopes and excavations [R]. Washington D C, USA. Federal Highway Administration, 1991.
  15. YEUNG A T, CHENG Y M, THAM L G, AU A S K, SO S T C, CHOI Y K. Field evaluation of a glass-fiber soil reinforcement system [J]. Journal of Performance of Constructed Facilities, 2007, 21(1): 26-4. CrossRef
  16. HONG C Y. Study on pullout resistance of cement grouted soil nails [D]. Hong Kong, China: The Hong Kong Polytechnic University, 2011.
  17. SCHLOSSER F. Behaviour and design of soil nailing [C]// International Symposium on Recent Development in Ground Improvement Techniques. Bangkok, 1982: 399-13.
  18. CHU L M. Study on the interface shear strength of soil nailing in completely decomposed granite (CDG) soil [D]. Hong Kong, China: The Hong Kong Polytechnic University, 2003.
  19. CHAI X J, HAYASHI S. Effect of constrained dilatancy on pull-out resistance of nails in sandy clay [J]. Ground Improvement, 2005, 9(3): 127-35. CrossRef
  
• 作者单位：Cheng-yu Hong (11735)
  Jian-hua Yin (21735)
  Hua-fu Pei (21735)
  
  11735. Department of Civil Engineering, Shantou University, Shantou, 515063, China
  21735. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
  

文摘

Pullout resistance of a soil nail is a critical parameter in design and analysis for geotechnical engineers. Due to the complexity of field conditions, the pullout behaviour of cement grouted soil nail in field is not well investigated. In this work, a number of field pullout tests of pressure grouted soil nails were conducted to estimate the pullout resistance of soil nails. The effective bond lengths of field soil nails were accurately controlled by a new grouting packer system. Typical field test results and the related comparison with typical laboratory test results reveal that the apparent coefficient of friction (ACF) decreases with the increase of overburden soil pressure when grouting pressure is constant, but increases almost linearly with the increase of grouting pressure when overburden pressure (soil depth) is unchanged. Water contents of soil samples at soil nail surfaces show obvious reductions compared with the results of soil samples from drillholes. After soil nails were completely pulled out of the ground, surface conditions of the soil nails and surrounding soil were examined. It is found that the water content values of the soil at the soil/nail interfaces decrease substantially compared with those of soil samples extracted from drillholes. In addition, all soil nails expand significantly in the diametrical direction after being pulled out of ground, indicating that the pressurized cement grout compacts the soil and penetrates into soil voids, leading to a corresponding shift of failure surface into surrounding soil mass significantly.