基于Hoek-Brwon准则的软岩隧道围岩极限变形估算方法

doi:10.13722/j.cnki.jrme.2021.0180

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摘要隧道围岩稳定极限变形是判别围岩稳定状态的关键性指标，围绕隧道围岩稳定极限变形的确定方法展开研究。针对软弱岩体的力学特征及其在隧道开挖中的响应机制，假定岩体等效为Hoek-Brown(H-B)材料。以此为前提，导出圆形隧道中基于H-B屈服准则的围岩松动区半径的解答。将该解答与Rabcewicz的剪切滑移模型结合，获得隧道围岩稳定极限状态所需的支护阻力的解答。在此基础上，进一步建立隧道围岩稳定极限变形的估算方法。利用数值计算实例资料，验证该估算方法的有效性。此外，针对围岩力学参数及隧道几何参数对隧道稳定极限变形的影响特征作参数分析。分析结果表明，围岩极限应变对远场应力、无侧限抗压强度和霍克–布朗常数的敏感性较强，而对未扰动岩石弹性模量、泊松比和隧道开挖半径的敏感性相对较弱。

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	苏雅
	苏永华
	赵明华

关键词 ：隧道工程, 软岩, 隧道围岩极限变形, Hoek-Brown准则, 剪切滑移模型

Abstract：Ultimate deformation of tunnel surrounding rock has been regarded as a critical index for evaluation of surrounding rock stability. This study attempts to work on the approach to the tunnel surrounding rock ultimate deformation. This approach relies on an assumption that the rock mass materials obey the H-B criterion，according to the mechanical characteristics of weak rocks as well as their response mechanism to excavation. Based on this assumption, the radius of loose region，generated within the surrounding rock of circle tunnels，is formulated. Next，this formulation is combined with Rabcewicz?s initial instability mode，attaining a method of computing support resistance that is required to stabilize the tunnel. Furthermore，the approach is established to calculate the ultimate deformation of tunnel surrounding rock. This established evaluation approach is validated through a comparison to numerical data provided by existing studies. Parametric analysis is also conducted，investigating the effect of rock mass properties and of tunnel geometric parameters on the ultimate deformation/strain of tunnel surrounding rock. It reflects that the tunnel surrounding rock ultimate strain has relatively high sensitivity to far-field stress，unconfined compression strength and H-B constant，while that is low in terms of intact rock Young?s modulus，Poisson?s ratio and tunnel radius.

Key words： tunnelling engineering weak rock tunnel surrounding rock ultimate deformation Hoek-Brown criterion rock initial instability mode

引用本文:

苏雅，苏永华，赵明华. 基于Hoek-Brwon准则的软岩隧道围岩极限变形估算方法[J]. 岩石力学与工程学报, 2021, 40(S2): 3033-3040.
SU Ya，SU Yonghua，ZHAO Minghua. An evaluation approach to ultimate deformation of tunnel surrounding rock in weak rocks based on the Hoek-Brown criterion. , 2021, 40(S2): 3033-3040.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0180 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/IS2/3033

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