Seepage-stress-damage coupling analysis of hydraulic tunnel due to its liner cracking

Abstract eng:
Deep tunnel is a kind of structure widely used in huge hydraulic projects built in west of china. Because of some micro cracks in the reinforced concrete liner induced by high internal water pressure, the stresses in the liner and its surrounding rock mass change and seepage-stress coupling analysis is more reasonable. In this paper a seepage-stress-damage coupling analysis model is presented to model the damage cracking, the changing of the seepage field and the stresses of rebar in the liner. The seepage-stress-damage coupling equation in finite element format is deduced and double spring model is introduced to model the bond slip between the rebar and the liner concrete. At last, the model is applied to study the effect of seepage due to the liner cracking on the stresses in the liner. The coupling analysis results reveal that the permeability in the damage cracking region increases highly and the tensile stress of the rebar in the liner decreases, which is different with the general reinforced concrete structure, called “retraction phenomenon”.

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