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Influence of Critical Parameters on the Peak Pullout Resistance of Soil Nails Under Different Testing Conditions

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International Journal of Geosynthetics and Ground Engineering Aims and scope Submit manuscript

Abstract

This paper presents a comprehensive analysis of the correlation between influencing parameters and peak pullout resistance (PPR) of soil nails installed in typical completely decomposed granite (CDG) or sand. A total of eight soil nail pullout tests were conducted in a field to examine the influence of overburden pressure (OP) and grouting pressure (GP) on the PPR of soil nails. Comparative analysis indicates PPR values of soil nails pulled out in soils with low degrees of saturation (30%) are almost twice of that in almost fully saturated soils. Apparent coefficient of friction (ACF) increases linearly as the increase of GP, but decreases linearly as the increase of OP when GP is constant in both laboratory and field tests. Extensive studies also show that the magnitude of normalized ACF is more sensitive to OP compared with GP and degree of saturation (Sr). Diameter increase in percentage of soil nails pulled out from field are almost twice of the soil nail diameters in laboratory tests, indicating that due to complex geological condition in field (such as possible high void ratio of field soils), failure surface of soil nails presents substantial shift into surrounding soils.

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Acknowledgements

Financial support from National Natural Science Foundation of China, the NSFC (Project Nos: 41602352 and 41372280), Key Laboratory of Structure and Wind Tunnel of Guangdong Higher Education Institutes, Shantou 515063, China (Project No: 201603), and the Fundamental Research Funds for the Central Universities, and Henan Key Laboratory of Textile Materials.

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Authors and Affiliations

  1. Department of Civil Engineering, Shanghai University, Shanghai, 200444, China

    Cheng-Yu Hong, Zi-Xiong Liu & Meng-Xi Zhang

  2. Key Laboratory of Structure and Wind Tunnel of Guangdong Higher Education Institutes, Shantou, 515063, China

    Cheng-Yu Hong

  3. College of Textiles, Donghua University, Shanghai, 201620, China

    Yi-Fan Zhang

  4. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong

    Lalit Borana

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  1. Cheng-Yu Hong
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  2. Zi-Xiong Liu
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  3. Yi-Fan Zhang
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  4. Meng-Xi Zhang
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  5. Lalit Borana
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Correspondence to Cheng-Yu Hong.

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Hong, CY., Liu, ZX., Zhang, YF. et al. Influence of Critical Parameters on the Peak Pullout Resistance of Soil Nails Under Different Testing Conditions. Int. J. of Geosynth. and Ground Eng. 3, 19 (2017). https://doi.org/10.1007/s40891-017-0095-5

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  • DOI: https://doi.org/10.1007/s40891-017-0095-5

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