隧道纵向变形曲线与围岩特征曲线耦合分析

doi:10.11779/CJGE201404015

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摘要目前,多数关于开挖面空间效应的研究仅采用弹性与理想弹塑性模型进行分析。然而,具有不同地质强度指标（GSI）的岩体呈现不同的峰后破坏模式,应采用合适的力学模型计算表征空间效应的隧道纵向变形曲线。同时,可将相同模型下围岩特征曲线与之进行耦合,从而指导隧道支护设计。提出了一种简便的基于有限差分法的分析方法,该法可计算Hoek-Brown与Mohr-Column屈服准则下,采用理想弹塑性、弹脆塑性、应变软化模型的隧道纵向变形曲线与围岩特征曲线。利用已有研究成果,验证了方法的合理性,并比较了不同GSI范围与不同力学模型下开挖面后部某一位置处的虚拟支撑力。结果表明：GSI越大,3种模型下对应的虚拟支撑力差别越大,更应如实考虑岩体峰后力学行为；GSI中等或较高时,离开挖面距离小于约0.8倍洞径时,理想弹塑性模型设计偏于保守,但大于此距离时情况相反。

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	崔岚
	郑俊杰
	苗晨曦
	董友扣

关键词 ：隧道, 围岩, 变形, 耦合分析, 弹塑性本构模型

Abstract：At present, most of the existing studies on the spatial excavation effects are conducted by means of the elastic and elastic-perfectly-plastic models. However, the rock masses with different ranges of geological strength index (GSI) exhibit different behaviors during post-peak stages. An appropriate mechanical model should be adopted to study the longitudinal deformation profile (LDP). Then, LDP can be coupled to ground reaction curve (GRC) so as to aid the support design. By use of the finite difference method, a simple analysis approach is proposed. Based on the Hoek-Brown and Mohr-Column failure criteria, this method can obtain LDPs and GRCs using elastic-perfectly-plastic, elastic-brittle-plastic and plastic strain-softening models. The calculated results are compared with those from other existing methods to verify the calculation accuracy of the proposed method, and a further study is made to investigate the virtual support pressure at a certain location behind the excavation face. The results indicate that the higher the value of GSI, the greater the difference of virtual support pressure for the three models, and thus it is more necessary to consider the post-peak mechanical behavior of higher value of GSI realistically; for an intermediate and relatively high value of GSI, an elastic-perfectly-plastic model leads to a conservative estimation of the support design as the distance to the excavation face is within approximately 0.8 of the tunnel radius, and the case is quite contrary while the distance is over 0.8 of the tunnel radius.

Key words： tunnel surrounding rock mass deformation coupling analysis elasto-plastic constitutive model

收稿日期: 2013-08-19

:	TU43
	U451.2

基金资助:新世纪优秀人才支持计划资助项目（NCET - 06 - 619）

通讯作者: *通讯作者

作者简介: 崔岚（1989- ）,女,湖北英山人,博士,主要从事岩石力学与隧道工程方面研究工作。E-mail: cuilan@hust.edu.cn。

引用本文:

崔岚, 郑俊杰, 苗晨曦, 董友扣. 隧道纵向变形曲线与围岩特征曲线耦合分析[J]. 岩土工程学报, 2014, 36(4): 707-715. CUI Lan, ZHENG Jun-jie, MIAO Chen-xi, DONG You-kou. Coupling analysis of longitudinal deformation profile and ground reaction curve. Chinese J. Geot. Eng., 2014, 36(4): 707-715.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/10.11779/CJGE201404015 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2014/V36/I4/707

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