期刊
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
卷 14, 期 6, 页码 1836-1848出版社
SCIENCE PRESS
DOI: 10.1016/j.jrmge.2021.12.023
关键词
Face stability; Rock tunnel; Layered rock masses; Upper bound solution; Hoek-Brown criterion
资金
- Key Innovation Team Program of Innovation Talents Promotion Plan by MOST of China [2016RA4059]
- Science and Technology Project of Yunnan Provincial Transportation Department [25]
This paper presents a 2D analytical model for estimating the face stability of a rock tunnel in the presence of stratified rock masses. The results indicate that the thickness of the rock layer, tunnel diameter, and arrangement sequence of weak and strong rock layers significantly affect the tunnel face stability.
An analysis of tunnel face stability generally assumes a single homogeneous rock mass. However, most rock tunnel projects are excavated in stratified rock masses. This paper presents a two-dimensional (2D) analytical model for estimating the face stability of a rock tunnel in the presence of rock mass stratification. The model uses the kinematical limit analysis approach combined with the block calculation technique. A virtual support force is applied to the tunnel face, and then solved using an optimization method based on the upper limit theorem of limit analysis and the nonlinear Hoek-Brown yield criterion. Several design charts are provided to analyze the effects of rock layer thickness on tunnel face stability, tunnel diameter, the arrangement sequence of weak and strong rock layers, and the variation in rock layer parameters at different positions. The results indicate that the thickness of the rock layer, tunnel diameter, and arrangement sequence of weak and strong rock layers significantly affect the tunnel face stability. Variations in the parameters of the lower layer of the tunnel face have a greater effect on tunnel stability than those of the upper layer. (C) 2022 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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