Numerical and experimental studies of the mechanical behaviour for compaction grouted soil nails in sandy soil |
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| Institution: | 1. Department of Chemical System Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;2. Department of Biotechnology, Osaka University, 2-1, Yamadaoka, Suita 565-0871 Osaka, Japan |
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| Abstract: | A model test was conducted for a newly developed soil nail, the result of which was compared to that of a 3D finite element method (FEM) simulation. The shape angle (β) and friction coefficients (μ) contributed to the difference in pull-out force between the model test and the simulation. Further verifications were conducted, during which the pull-out mechanisms of the soil nail for different β and μ were analysed. It was found that both β and μ have a positive influence on the pull-out force; β only affects the increase rate, while μ influences the overall pull-out force level. Three components were found to govern the pull-out force, with the component applied to the expanded cement bulk surface accounting for approximately 80% of the total. This study proves that the optimal approach for increasing pull-out force is to enlarge the diameter of the cement bulk rather than extend the nail length. |
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| Keywords: | Compaction grouting Soil nail FEM Experimental tests |
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