城门洞型压力隧洞衬砌限裂配筋设计方法研究

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Abstract Taking the rectangular free-surface flow tunnel with arch crown to reconstruct into pressure hydropower tunnel as the object，the combined effects of surrounding rock，lining concrete and steel were synthetically analyzed when the lining cracks before and after occurring；a two-dimensional(plane strain) nonlinear finite element numerical simulation model was established. After that，the stress of steel，the stress of concrete，the regularities distribution of cracks，the crack width and the results of reinforcement design of the lining which is under the operation stage with internal water pressure conditions were got. Also，under the maintenance time with external water pressure conditions，the phenomenon of stress concentration of lining concrete cracks and the checking results of lining reinforcement were got. Compared with the previous methods the lining reinforcement design method proposed in this paper lead into more factors which may affects the reinforcement results，making the results much in line with the actual condition of the hydraulic pressure tunnel. It has guiding significance for similar engineering design.

Key words： tunnelling engineering pressure tunnel lining reinforcement numerical analysis lining cracks design by crack width control

Received: 14 October 2012

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http://www.rockmech.org/EN/Y2013/V32/I12/2409

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