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Prestressed constant-resistance large-deformation anchor cable has been proved to be an effective technology to control the large-deformation disaster of deep soft rock tunnel. However, there are few studies on the effect of support parameters. Based on a prestressed constant-resistance anchor cable, the control effect on the large-deformation of layered rock tunnel under different support density is analyzed in this paper, and the 2D-Finite-discrete element method (FDEM) numerical simulation technology is used. The results show that there is an optimal support density. Beyond this, the control effect on rock mass deformation will no longer increase, and the micro-cracks of rock mass will increase. The Finite element method (FEM) is used to analyze the shear performance of the anchor cable. The results show that the existence of the constant-resistance device will prolong the shear displacement and increase its stability in the complex rock mass. • An anchor cable support technology for controlling large deformation of layered rock tunnel is introduced. • Anisotropic failure characteristics of tunnel in layered rock mass are indicated. • The support strength law of the excavation compensation method is analyzed. • The anti-shear effect of constant resistance and large deformation anchor cable is discussed.
Zhang et al. (Sat,) studied this question.
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