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Abstract of the Article

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Application of Convergence – Proximity in Non – Circular Sections

Authors:
[ Shahram Vahdani ] - Of Technical Faculty of Tehran University
[ Urang Farzaneh ] - Of Technical Faculty of Tehran University
[ Mahsa Barandeh ] - M.S. Student of Technical Faculty of Tehran University .

Abstract:

Among the various models of tunnel lining analyses the convergence-proximity is one of the most useful methods . Regardless of simplicity, the method properly visualizes the soil structure interaction. In addition, soil characteristics , lining stiffness and the delay in fixing the lining will be simply observed . The most serious limitation of the method is its application for noncircular cross-sections due to the assumption of circular cross-section is its basic closed-form solution , where the usage of numerical models of any individual shape is unavailable . With a little care in closed-form solution of zero pressure state convergency , this solution can be transferred to a numerical integral , where , the circular cross-section limitation will be liminated . and the results can be extended to suitable geometric shape . In addition, the assumption uniform pressure around the excavation region can be modified , which will increases the validity of the method . The algorithm is presented as well as the range of validity of the method

Keywords:

Tunnel Analysis , Convergence-Proximity