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管棚预支护条件下隧道开挖面三维稳定性分析

, PP. 87-93

Keywords: 隧道工程,开挖面稳定,极限分析,管棚,强度折减技术

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Abstract:

为了研究管棚预支护对隧道开挖面稳定性的影响,从塑性极限分析机动学方法出发,利用土的强度折减系数概念,建立了管棚预支护条件下隧道开挖面三维稳定性分析模型,由此确定开挖面稳定系数及其相应的潜在破坏模式。结合实际工程,采用该方法计算得到的开挖面极限支护压力与有限元强度折减法的计算结果吻合较好,验证了本文方法的合理性。进而研究了隧道埋深、隧道洞径及围岩条件对开挖面稳定性的影响,分析了上述因素与开挖面极限支护压力及稳定系数的关系。对有无管棚预支护隧道开挖面稳定性分析表明在软弱地层、大跨洞径等条件下,管棚预支护能有效提高开挖面稳定性。

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