Abstract
As the mining depth increases, the deformation of the roadway becomes more difficult to control. As a main supporting structure for maintaining the stability of roadway, the fully anchored bolt is widely used to reinforce deep mine. At the same time, the analysis of the stress distribution law of fully anchored bolt is the basic work to optimize anchor design. Therefore, this paper establishes a fully anchored bolt‐surrounding rock interaction model based on the law of surrounding rock deformation and derives the analytical expressions for the axial force and shear stress of the fully anchored bolt during normal support and critical failure. At the same time, the effects of surrounding rock properties, support resistance, and bolt length on the stress distribution of fully anchored bolt are analyzed. The results show that the stress distribution of fully anchored bolt is consistent with the “neutral point” theory and the most important is the fact that the conditions of surrounding rock, the supporting resistance, and the length of bolt affect the actual stress distribution of the fully anchored bolt. It provides a certain theoretical basis for the design and development of anchoring and supporting technology.
Highlights
Research ArticleChengxing Zhao ,1,2,3 Yingming Li ,1,2,3 Gang Liu, Dengguo Chen, and Xiangrui Meng
As one of the important branches of the field of geotechnical engineering, anchoring support technology is widely used in defense engineering, mining engineering, and water conservancy engineering due to its effective support effect, low cost, and convenient construction [1,2,3,4,5,6,7,8,9]
The fully anchored bolt is subjected to complex forces during the support process, resulting in the development of anchoring technology theory and relatively slow anchoring design [12,13,14]; anchoring support technology lacks theoretical basis. e stress characteristics of the fully anchored bolt and the stress distribution law at the Advances in Civil Engineering anchoring interface are important contents in anchoring support technology
Summary
Chengxing Zhao ,1,2,3 Yingming Li ,1,2,3 Gang Liu, Dengguo Chen, and Xiangrui Meng. E results show that the stress distribution of fully anchored bolt is consistent with the “neutral point” theory and the most important is the fact that the conditions of surrounding rock, the supporting resistance, and the length of bolt affect the actual stress distribution of the fully anchored bolt. The effects of surrounding rock properties, support resistance, and bolt length on the stress distribution of fully anchored bolt are analyzed. It provides a certain theoretical basis for the design and development of anchoring and supporting technology
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