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The paper presents also a practical example illustrating the application of all equations needed to construct the support characteristic curve for the combined support system.
Construction of support characteristic curves is an important aspect of the implementation of the convergence-confinement method of tunnel support design.
This paper fills this gap, providing the derivation and validation of all the equations required to construct the support characteristic curve for the combined support system.
This paper presents a detailed analysis of the equations required to construct the support characteristic curve of a combined support system consisting of closed circular steel sets linked to the periphery of the tunnel by equally spaced prismatic wood blocks.
In the limit, when the angle between wood blocks is assumed to be zero, the paper shows that the classical equations for construction of support characteristic curve for a steel set subjected to uniform radial load are recovered.
Equations that allow the construction of the three basic components of the Convergence-Confinement method, i) the Longitudinal Deformation Profile (LDP), ii) the Ground Reaction Curve (GRC) and iii) the Support Characteristic Curve (SCC) are given.
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A procedure of controlling the slope of the support characteristics versus frequency of excitation has been used and found to be very suitable for obtaining feasible support characteristics.
Dispersion and nature of the iridium species are dependent parameters on the support characteristics.
This process yields better support characteristics than those obtained by minimizing unbalance response alone.
A sensitivity study of the UBR and SLS with respect to the support characteristics has been presented to have an idea about the permissible deviation of the support characteristics from the respective optimum, at any frequency.
An accurate prediction of the support characteristics (contact force vs. deflection) is the most crucial in the design by analysis.
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