Research on the Construction Technology of Large Pipe Shed in the Poor Geological Sections of the Underground Cavern in Hami Pumped Storage Project
In order to ensure the safe construction of the tunnel in the fault fracture zone and the stability of the rock mass of the tunnel face,a design method for the supporting parameters of the pipe shed was proposed.As an important reinforcement measure in the construction of poor geological sections of tunnels,large pipe sheds are widely used in various engineering practices,but the research on the construction parameters and support effects of pipe sheds is still far behind the actual engineering requirements,and many design parameters lack engineering construction verification.Combined with the example of the Hami pumped storage project,only small conduits were used for the early advance support in the construction of the ventilation and safety tunnel and the access tunnel,and the tunnel face collapsed several times.Based on the tunnel collapse,the support u-sing only small conduits was verified to be weak.The paper expounds the design of the pipe shed support,and adopts the support form of"pipe shed+steel bundle+steel support+nano imitation steel fiber reinforced concrete closed"to achieve a good reinforcement effect.The research results can provide a reference for the de-sign of the supporting parameters of tunnel pipe sheds in fault fracture zones.
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