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扁坦超大断面小净距隧道支护结构的力学性状

, PP. 89-94

Keywords: 隧道工程,超大断面小净距隧道,数值模拟,双侧壁法,力学性状

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Abstract:

超大断面软弱围岩小净距隧道跨度大、埋深浅、施工步骤多、中间岩柱受力复杂、围岩稳定性差。为了研究适合于浅埋软弱围岩超大断面小净距隧道施工的工法,采用有限差分软件FLAC-3D对其施工过程进行数值模拟,模拟研究8车道超小净距隧道Ⅴ级围岩条件下的双侧壁法、三台阶法和CRD法施工过程,揭示该隧道在施工过程中的围岩变形规律、中间岩柱和支护结构受力性状,优化施工方案。模拟研究结果表明,与三台阶法和CRD法相比,采用双侧壁法施工时隧道围岩塑性区和中间岩柱塑性区最小,锚杆轴力最小,围岩变形较小,该法适合于弱软围岩超大断面小净距隧道施工。双侧壁法施工时的围岩变形规律和支护结构受力性状的数值模拟结果与现场监测结果基本一致,从而进一步验证了数值模拟分析结果的可靠性。

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