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- W4213425498 abstract "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." @default.
- W4213425498 created "2022-02-25" @default.
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- W4213425498 date "2022-12-01" @default.
- W4213425498 modified "2023-10-06" @default.
- W4213425498 title "Face stability analysis of circular tunnels in layered rock masses using the upper bound theorem" @default.
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- W4213425498 doi "https://doi.org/10.1016/j.jrmge.2021.12.023" @default.
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