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| Experimental Study on the Effect of Longitudinal Crack on Reinforced Concrete Tunnel Lining |
| LIU Xue-Zeng-a, BAO Hao-杉a, ZHOU Min-b |
(aSchool of Civil Engineering; bArchitectural Design & Research Institute,
Tongji University, Shanghai 200092, China) |
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Abstract Based on the loadstructure model,the structure test of reinforced concrete lining was done to establish the calculation model of reinforced concrete lining with crack. The relation curve of longitudinal crack depth and structure rotational stiffness was obtained through the analysis of deformation and crack development of reinforeced concrete lining in loading process. Exponential function could describe the curve of rapid change phase and stable phase, while parabola function could describe the curve of the accelerated change phase. A calculation model of reinforced concrete lining with one crack was proposed, and the crack was simulated by the connected spring whose parameters are determined through the results of lining structure test and theoretical analysis. The calculated safety factor can be used to evaluate the necessity of the concrete linings further strengthening. The proposed model has guiding significance to practical tunnel engineering.
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Received: 07 March 2011
Published: 30 March 2012
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