考虑围压效应和中主应力的深埋软岩隧道弹塑性解

doi:10.13722/j.cnki.jrme.2023.0073

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摘要高地应力深埋软岩隧道开挖卸荷后，断面周边围岩的径向应力急剧降低，围压从围岩深部至隧道洞壁急剧衰减，不同位置岩石的应变软化和剪胀扩容受围压效应的控制。基于三维H-B强度准则建立考虑围压效应和中主应力的深埋软岩隧道弹塑性解计算方法，并依托中老铁路新华隧道计算深埋滇中红层软岩隧道的挤压变形，讨论围压效应和中主应力对围岩应力–应变特征、强度软化特征和剪胀扩容特征的影响，探讨围压效应在不同峰值强度、原岩应力和支护反力下的敏感性。研究结果表明：围压效应通过降低岩石的临界塑性偏应变和增大岩石的峰值剪胀扩容系数，从而加剧围岩的软化和剪胀程度，进而加剧隧道的挤压变形；中主应力会降低围岩的软化程度，加剧围岩的剪胀扩容，但整体上能有效抑制深埋软岩隧道的挤压变形；岩石峰值强度越低、埋深地应力越大时，隧道的挤压变形受围压效应的影响程度越高。因此分析高地应力深埋软岩隧道开挖卸荷的力学响应时，不能忽视围压效应的影响；支护反力能有效抑制效围压效应对隧道挤压变形的影响，在深埋软岩隧道的施工建设时应及时施作支护结构约束围岩的变形。

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	郑可跃1
	2
	施成华1
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	赵前进1
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	雷明锋1
	贾朝军1
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	娄义黎1
	2

关键词 ：隧道工程, 深埋隧道, 软弱围岩, 围压效应, 中主应力, 弹塑性解

Abstract：After excavation and unloading of deep soft rock tunnels under high in-situ stresses，the radial stress of the surrounding rock will decrease sharply，indicating that the confining stress will decrease sharply from deep to the tunnel wall. The strain-softening behavior and the shear-expansion behavior of rocks at different locations are controlled by the confining stress effect. In this study，based on the three-dimensional H-B strength criterion，a computing method for the elastoplastic solution of deep soft rock tunnels considering both confining stress effect and medium principal stress was developed. It was employed in the Xinhua tunnel of the China—Laos railway to calculate the squeezing deformation of deep buried tunnels passing through red layer in Yunan. Further，the influences of confining stress effect on stress-strain characteristics，strength-softening characteristics，and shear-expansion characteristics were discussed. Besides，the sensitivities of confining pressure effect under different peak rock strengths，in-situ stress，and supporting force were also learned in this study. The conclusions of this study are as follows：The confining stress effect can reduce the critical plastic deviator strain( ) and increase the peak dilatancy coefficient( ) of rocks. Thus it can improve the degree of strain softening and dilatancy capacity. Then the squeezing deformation will be intensified. The medium principal stress will reduce the strain softening and increase the shear expansion of the surrounding rock. However，it can restrain the squeezing deformation of deep soft rock tunnels in general. When tunnels are constructed under a situation with low peak rock strength and high in-situ stress，the squeezing deformation is seriously affected by confining stress effect. Therefore，the confining stress effect cannot be ignored when analyzing the mechanical response of deep soft-rock tunnels under high in-situ stress. The support force can suppress the confining stress effect on the squeezing deformation of tunnels. Thus，during the construction of deep soft rock tunnels，support structures should be installed in time. So the deformation of the surrounding rock can be well restrained after excavation.

Key words： tunnelling engineering deep tunnel soft rock confining stress eff

引用本文:

郑可跃1，2，施成华1，2，赵前进1，3，雷明锋1，贾朝军1，2，娄义黎1，2. 考虑围压效应和中主应力的深埋软岩隧道弹塑性解[J]. 岩石力学与工程学报, 2023, 42(12): 3070-3084.
ZHENG Keyue1，2，SHI Chenghua1，2，ZHAO Qianjin1，3，LEI Mingfeng1，JIA Chaojun1，2，LOU Yili1，2. Elastoplastic solution of deep soft rock tunnels considering confining pressure effect and medium principal stress. , 2023, 42(12): 3070-3084.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0073 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I12/3070

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