软弱围岩中的新型双层复合衬砌的受力特性研究及渗水风险分析

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Abstract A water diversion tunnel is located in the soft surrounding rocks，and double composite linings are employed during tunnel structure. In order to reveal the mechanical properties of such prestressed double composite linings，the 1∶1 simulation model test and 3D nonlinear finite element method are used. The test processes，including segments assembling，earth filling by layer，inner lining casting，pretension of inner linings，and applied water pressure，are simulated in sequence in the finite element model. Besides，the coupling effects of lining and earth are also taken into consideration. The earth parameters are determined by back analysis method with the displacement of outer lining. The contact between the assembled segments and the inner or the outer lining is also simulated by contact algorithm based on direct control method. The results of finite element method match well with test results，such as displacement and stress of structure，opening of gap. Furthermore，the seepage rise is discussed and corresponding measures are proposed. The results are helpful for the design of similar engineering projects.

Key words： tunnelling engineering water diversion tunnel double composite linings nonlinear finite elements simulation test

Received: 02 May 2013

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/I9/1791

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