A Simple Method for Analysis of Point Anchored Rockbolts in Circular Tunnels in Elastic Ground |
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| Authors: | A Bobet |
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| Institution: | (1) Purdue University, West Lafayette, Indiana, U.S.A. |
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| Abstract: | Summary. A simple analytical method for the analysis of point anchored rockbolts is presented in this paper. The solution has been
derived for elastic ground and rockbolts, for plane strain conditions, and for tunnels with circular cross section. The method
provides accurate results for the rockbolts’ loads and displacements and explicitly includes the connection of the rockbolts
to the surrounding ground. The addition of such details to a Finite Element numerical model is critical; otherwise the solution
obtained may be dependent on the discretization used and on the stiffness of rockbolts and ground. As an alternative to including
details of the rockbolt head and anchor point in the numerical model, which could be computationally very expensive, an equivalent
spring constant is proposed. The spring constant is obtained by matching numerical with analytical results for a simple case,
but keeping the geometry, material properties, and discretization unchanged. |
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| Keywords: | : Tunnel point anchored rockbolts elastic analytical solution |
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