Research on Stability Control Technology of Tunnel in Debris Flow Accumulation Body
The tunnel passes through debris flow accumulation body,with loose and fragmented surrounding rock,poor cohesion,and easy collapse of the tunnel face and surrounding area.The settlement variable of the initial support arch foot is large,and the overall instability risk of the initial support structure is high,making it difficult to ensure construction safety.For this purpose,combined with the Hongqiaoguan Tunnel crossing the debris flow accumulation section project,research on stability control technology for debris flow accumulation tunnel is carried out.Practice has shown that the use of advanced support measures for the tunnel face combined with pipe shed and glass fiber anchor rods has enhanced the stability of the tunnel face and controlled the deformation and damage of the tunnel face towards the tunnel clearance;the surrounding rock reinforcement technology of 'first consolidation and then nailing method'(i.e.surface vertical and tunnel longitudinal group pile grouting reinforcement and soil nail reinforcement of surrounding rock)has improved the physical and mechanical properties and deformation and failure resistance of the surrounding rock;the settlement control technology of the initial support arch combined with anchor piles and cross arm beams has solved the settlement problem of the locking foot of the initial support arch in the tunnel,improved the stability of the arch structure,and ensured the safe and efficient construction of the tunnel.
debris flow accumulation bodytunnel engineeringstability controlfirst consolidation and then nailing methodanchor pile
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