巷道围岩应力场结构的表征及破坏因素分析

Analysis on representation of stress field structure of roadway surrounding rock and its failure factor

巷道围岩应力场结构对巷道的变形和破坏有重要的影响,为了表征巷道围岩应力场结构,提出使用主应力迹线来可视化显示应力场,并通过主应力迹线图中退化点的位置和类型,以及优势主应力迹线束的分布来表征应力场的结构。分别对不同侧压系数和岩层组合条件下的巷道进行数值模拟,根据模拟结果手工描绘出主应力迹线图,得出巷道围岩应力场结构变化的一般规律,以及由此造成的巷道围岩破坏规律的变化。结果表明:应力迹线图是表征巷道围岩应力场结构的有效方法,巷道围岩破坏和应力场结构之间存在较明确的关系。该研究为巷道围岩控制理论研究提供新的思路。

The stress field structure in roadway surrounding rock has an important influence on the deformation and failure of roadway. In order to represent the stress field structure in roadway surrounding rock,a method was put forward which useing principal stress trajectories to visualize stress field. Consequently,the stress field structure was represented by the position and types of the degenerate points in the principal stress trajectories diagram and the distribution of dominant principal stress trajectories bundle. Numerical simulation was carried out for different lateral pressure coefficient and strata combination of roadway,and the principal stress trajectories were drawn by hand according to the simulation results. The varying pattern of the stress field structure was summarized,and the relationship between stress field structure and rock failure characteristics was also derived. The results showed that stress trajectories were an effective method to represent the stress field structure of roadway surrounding rock,there was an explicit relationship between the failure of roadway surrounding rock and the structure of stress field. These research findings provided a new approach for the establishment of roadway surrounding rock control theory.