深埋岩体隧道开挖面三维非线性挤出效应分析

doi:10.13722/j.cnki.jrme.2021.0448

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Abstract Deep rock tunnels are often in complicated true triaxial stress state and the mechanical behavior of the surrounding rock is significantly different from that in shallow tunnels，resulting in that the commonly applied strength criteria and tunnel design methods obtained from shallow tunnels cannot meet the requirement of the refined rock stability analysis for deep tunnels. The three-dimensional(3D) space effect near tunnel faces is often simplified or ignored in design and operation of a shallow tunnel，but its influence on rock stability and construction safety of deep tunnels must be paid enough attention to. The 3D geological model and tunnel numerical calculation model were established according to a typical deep rock tunnel in western China. Based on the GZZ strength criterion，the 3D finite element numerical simulation of the excavation process of tunnels with different buried depths was carried out to study the 3D and non-linear space effects of the deep tunnel face，and thus to reveal the complicated stress path and the time-dependent evolution mechanism of non-linear extrusion deformation during the deep tunnel excavation. The research results show that：(1) the input parameters of GZZ strength criterion such as rock mass GSI can be quickly，automatically and accurately obtained with the help of digital acquisition technologies such as on-site 3D photography，laser scanning and 3D reconstruction，which helps to realize the 3D positive analysis of the surrounding rock stability；(2) the extrusion deformation of the excavation face of a deep-buried tunnel，more significant than that of a shallow-buried tunnel，is mainly plastic and shows a parabolic nonlinear relationship with the buried depth，while the plastic yield state of the excavation face precedes the surrounding rock；(3) there is a significant 3D space effect in the range of 3 - 4 m before and after the tunnel face，and all the three principal stresses undergo tremendous changes accompanied by an obvious rotation of the principal stress axis，which are mainly caused by the sharp increase of the shear stress at the tunnel face；(4) the stress level I1 at the core of the tunnel face is much lower than that of the surrounding rock，but the instability of the tunnel face caused by excavation unloading is more serious than that of the surrounding rock caused by loading；and (5) the distortion of the steel arch and the non-uniform longitudinal deformation of the surrounding rock in deep-buried tunnels are mainly related to s3 and s2，and the effect of s2 increases significantly when the buried depth exceeds a certain depth.

Key words： rock mechanics deep-buried rock tunnel extrusion of tunnel face principal stress rotation complex stress path GZZ strength criterion

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	Articles by authors
	CAI Wuqiang1
	LIANG Wenhao1
	2
	ZHU Hehua1
	3

Cite this article:

CAI Wuqiang1,LIANG Wenhao1,2, et al. Three-dimensional and nonlinear face extrusion effects of deep-buried rock tunnels under excavation unloading[J]. , 2021, 40(9): 1868-1883.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0448 OR http://rockmech.whrsm.ac.cn/EN/Y2021/V40/I9/1868

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