Abstract
Deformation and failure mechanism of the surrounding rock of the floor roadway under the influence of working face mining is complicated, and roadway control is difficult. The floor roadway of the 11123 working face in Pan’er Mine is taken as the research object of this study based on semi‐infinite body theory of elastic mechanics to establish a mechanical model along the advancing direction of the working face and derive the stress expression of any point in the affected area of floor mining. According to the theoretical results, effective reinforcement and support schemes are then proposed. FLAC3D numerical simulation analyzes the stress and deformation of the surrounding rock of the floor roadway before and after the reinforcement. The numerical simulation results showed that (1) mining abutment pressure of the overlying working face forms a certain range of stress concentration on the roof and two sides of the roadway and will cause deformation and damage to the floor roadway and (2) overall bearing capacity of the surrounding rock of the roadway is significantly improved, and surface displacement of the floor roadway is reduced by 64 mm through the reinforcement and support of the floor roadway. On‐site monitoring data of the floor roadway in the 11123 working face of Pan’er Mine showed that the maximum displacement of the roadway roof and two sides is controlled at approximately 80 mm, and the surrounding rock deformation of the roadway is appropriately controlled to meet the needs of safe production.
Highlights
Mining conditions of coal seam undermines have become increasingly complex due to the growing demand for coal in recent years. e mining of working faces can affect adjacent roadways, including their stability. e roadway is a vital part of mining development and connected to the mining and transportation of coal resources. erefore, the stability control of the roadway surrounding rock under complex conditions is important for the safe and efficient mining of coal mines [1,2,3,4,5,6,7,8]
Many in-depth studies have been conducted on the failure mechanism and deformation control technology of the surrounding rock of the roadway
Dongyi group A coal can be found east of the 11123 working face of Pan’er Mine of Huainan Mining Group; the west side of the study area is near the upper roadway of the 12223 working face; the south side is near the 11124 working face floor roadway; and the north is close to the 11223 up groove
Summary
Mining conditions of coal seam undermines have become increasingly complex due to the growing demand for coal in recent years. e mining of working faces can affect adjacent roadways, including their stability. e roadway is a vital part of mining development and connected to the mining and transportation of coal resources. erefore, the stability control of the roadway surrounding rock under complex conditions is important for the safe and efficient mining of coal mines [1,2,3,4,5,6,7,8]. Erefore, the stability control of the roadway surrounding rock under complex conditions is important for the safe and efficient mining of coal mines [1,2,3,4,5,6,7,8]. Many in-depth studies have been conducted on the failure mechanism and deformation control technology of the surrounding rock of the roadway. Wang et al [10] used Shandong Hanzhuang Coal Mine Substation as an example, applied on-site monitoring and drilling imaging methods, analyzed the deformation and failure mechanism of the surrounding rock of the roadway, and proposed a segmented bolt grouting reinforcement technology. Yu et al [11] used FLAC3D numerical calculation and theoretical analysis to reveal the deformation mechanism of the roadway under complex stress conditions. Engineering conditions of the examined roadway in this study are complex. e engineering measurement results of the project showed that the reinforcement and support scheme meets the requirements of safe production
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