RESEARCH ON SEEPAGE OF HIGH PRESSURE HYDRAULIC TUNNEL WHEN REINFORCED CONCRETE LINING CRACKING
(1. State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan,Hubei 430072,China;2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education,Wuhan University,Wuhan,Hubei 430072,China)
Abstract:Based on the elastic damage theory and seepage theory of equivalent continuum media,a method for evaluating the seepage of high pressure hydraulic tunnel after the lining cracking is presented. Changes in crack width of reinforced concrete under different water pressures are considered as the main factors of permeability changes of the lining. The situations of the internal water exuding from the tunnel when water fills the tunnel and the outer water infiltrating into the tunnel when the tunnel is empty are studied respectively. The influences of consolidation grouting under high pressure and the situation when faults get touch with the lining are considered. The comparison between monitoring data of Huixu tunnel under high pressure and results from numerical calculation shows that the seepage of tunnel has a close relation to the crack width of lining and the existence of remarkable seepage channel nearby the tunnel. If there is no remarkable seepage channel nearby the tunnel,when water fills the tunnel or the tunnel is empty,the monitoring results agree better with the computation results. Otherwise,if the remarkable seepage channel which combines the concrete cracks with faults,the difference between monitoring and computation results will become larger. The research results provide an effective thought for the seepage discharge calculation of water flowing into and flowing out of the tunnel at different periods.
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