Analytical solutions for characteristic radii of circular roadway surrounding rock plastic zone and their application  

作　　者：Xiaofei Guo Zhiqiang Zhao Xu Gao Xiangye Wu Nianjie Ma 

机构地区：[1]Faculty of Resource and Safety Engineering, China University of Mining and Technology (Beijing) [2]Department of Energy and Mineral Engineering, The Pennsylvania State University, University Park [3]Institute of Mining Engineering, Inner Mongolia University of Science and Technology

出　　处：《International Journal of Mining Science and Technology》2019年第2期263-272,共10页矿业科学技术学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 51234006);the National Key Research and Development Program of China (Grant No. 2016YFC0600708)

摘　　要：In the non-uniform stress field, the surrounding rock plastic zone of the circular roadway shows different shapes under the different confining pressure conditions. Based on the boundary shape characteristics of the plastic zone, the characteristic radii of the plastic zone were proposed, namely the horizontal,longitudinal and medial axis radii, which could reflect the plastic zone shapes characteristics and classify the sizes of the key parts. On the theoretical basis of elastic-plastic mechanics, analytical solutions for the characteristic radii were obtained by theoretical deduction, and the relationships between the characteristic radii and key influencing factors were analyzed. Finally, the evaluation criterion of the circular roadway surrounding rock plastic zone shapes, evaluation criterion of the location of potential hazards caused by the roadway surrounding rock and evaluation critical points of roadway dynamic disasters based on characteristic radii were proposed. This work could provide a theoretical basis for stability analysis of the surrounding rock, support design, and guide the prevention and control of dynamic roadway disasters.In the non-uniform stress field, the surrounding rock plastic zone of the circular roadway shows different shapes under the different confining pressure conditions. Based on the boundary shape characteristics of the plastic zone, the characteristic radii of the plastic zone were proposed, namely the horizontal,longitudinal and medial axis radii, which could reflect the plastic zone shapes characteristics and classify the sizes of the key parts. On the theoretical basis of elastic-plastic mechanics, analytical solutions for the characteristic radii were obtained by theoretical deduction, and the relationships between the characteristic radii and key influencing factors were analyzed. Finally, the evaluation criterion of the circular roadway surrounding rock plastic zone shapes, evaluation criterion of the location of potential hazards caused by the roadway surrounding rock and evaluation critical points of roadway dynamic disasters based on characteristic radii were proposed. This work could provide a theoretical basis for stability analysis of the surrounding rock, support design, and guide the prevention and control of dynamic roadway disasters.

关 键 词：INHOMOGENEOUS stress field Analytical solutions CHARACTERISTIC RADII Morphological identification Disaster area 

分 类 号：TD[矿业工程]