Achieving a comprehensive and accurate understanding of the anchor reinforcement mechanism and a quantitative evaluation of\nthe surrounding rockâ??s stability for an anchored underground cavern can provide an important theoretical basis for supporting\nand excavating the cavern. First, the composite bearing structure composed of the anchor and surrounding rock was defined as the\nsurrounding rock reinforcement body by using the homogenization method, and a new method for evaluating the stability of\nsurrounding rock by the surrounding rock reinforcement body deformation and damage degree was proposed. Second, based on\nthe anchor reinforcement effect, the expression of the physical-mechanical parameters of the surrounding rock reinforcement\nbody was deduced, and the analytical solution of stress and displacement of the surrounding rock reinforcement body was\nobtained. Finally, the stability coefficient of surrounding rock indicating the degree of the surrounding rock reinforcement body\ndamage was defined. The research showed that the theoretical solution agreed well with the results of the numerical simulation,\nand the difference between the theoretical solution and the monitoring value was less than 10%, which verified the reliability of the\nmethod and the results of this paper. The design of the length and spacing of the anchor followed the principle of long but sparse\nand short but dense, and the pretightening force of the anchor and the stability coefficient of surrounding rock varied linearly. The\nanalytical solution of this paper provides a theoretical reference for understanding the mechanism of anchor support and provides\na quantitative evaluation method for the stability of surrounding rock. Compared with the traditional support design, the theory of\nthis paper gives full play to the self-stability of the surrounding rock and the strength of the anchor, which is conducive to saving\nsupport costs and avoiding the construction limitations in some projects.
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