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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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

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	Articles by authors
	ZHENG Keyue1
	2
	SHI Chenghua1
	2
	ZHAO Qianjin1
	3
	LEI Mingfeng1
	JIA Chaojun1
	2
	LOU Yili1
	2

Cite this article:

ZHENG Keyue1,2,SHI Chenghua1, et al. Elastoplastic solution of deep soft rock tunnels considering confining pressure effect and medium principal stress[J]. , 2023, 42(12): 3070-3084.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.0073 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/I12/3070

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