A new analytical solution to the mechanical behaviour of fully grouted rockbolts subjected to pull-out tests |
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Authors: | Laura Blanco Martín Michel Tijani Faouzi Hadj-Hassen |
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Affiliation: | Department of Geosciences, MINES ParisTech, 35 rue Saint-Honoré, 77305 Fontainebleau, France;Department of Materials Engineering, Université Paris-Est, French Public Works Research Laboratory (LCPC) Paris, France;Department of Structural Engineering , Université Paris-Est, French Public Works Research Laboratory (LCPC)Paris, France |
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Abstract: | A new analytical approach able to predict the mechanical behaviour of fully grouted rockbolts subjected to pull-out tests is proposed in this paper. Input parameters of such approach are: bolt radius, bolt’s Young modulus, displacement of the free end of the bolt and the constitutive law of the rockbolt–grout joint interface. The limited circumstances under which it is accurate to determine such constitutive law from pull-out tests are also presented. A solution for the load–displacement curve obtained during pull-out tests has been developed and is detailed in the case of a tri-linear bond-slip model. Comparison with experimental results obtained via in situ pull-out tests has led to the validation of this approach. |
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