为确保断层破碎带内隧洞的安全施工和掌子面岩体稳定,提出了一种管棚支护参数的设计方法。首先,对管棚分段且取其中一部分作为有效计算长度,采用太沙基理论计算松散破碎岩体对管棚的荷载,根据约束条件将洞内管棚简化为两端固支梁,得到管棚弯矩、挠度和端部反力。然后,根据岩体和管棚的各类破坏条件,推导了管棚支护参数的计算公式。最后,介绍该方法在某断层破碎带隧洞的应用情况。该隧洞前期超前支护仅采用小导管,已发生数次掌子面坍塌。基于此方法分析小导管支护偏弱并进行了管棚支护设计,在之后开挖过程中收敛变形减小,管棚支护取得了较好的加固效果。研究成果可为断层破碎带隧洞管棚支护参数设计提供参考。
Abstract
A method of designing the support parameters of pipe roof is proposed to ensure the safe construction of tunnel in fault fracture zone and the stability of surrounding rock of working face. First, the pipe roof is divided into several segments of which one part is taken as effective calculation length. The load of loose fractured rock mass on the pipe roof is calculated based on Terzaghi's theory. The bending moment, deflection, and end-reaction are obtained by simplifying the pipe roof into a beam with both ends fixed and supported. Furthermore, the calculation formulae for the support parameters of pipe roof are derived according to the failure conditions of rock mass and pipe roof. The method is applied to a tunnel in fault zone which has undergone several collapses of working face due to only small duct bracing. The results of the proposed method indicate that small duct bracing is inadequate, while pipe roof support could generate smaller convergence deformation during excavation. The research findings offer reference for the design of support parameters of pipe roof in tunnels constructed in fault zones.
关键词
隧洞 /
断层破碎带 /
管棚 /
参数设计 /
掌子面稳定
Key words
tunnel /
fault fracture zone /
pipe roof /
parameter design /
tunnel face stability
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基金
云南省重大科技专项计划项目(202102AF080001-4);中央级公益性科研院所基本科研业务费项目(CKSF2021715/YT)
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