Abstract
A floor rock roadway under an oblique straddle working face is a typical dynamic pressure roadway. Under the complex disturbance of excavation engineering works, the roadway often undergoes stress concentration and severe deformation and damage. To solve the problem of surrounding rock stability control for this roadway type, this study considered the East Forth main transport roadway in the floor strata of the 1762(3) working face of the Pansan coal mine. In situ ground pressure monitoring and numerical simulation calculation using the FLAC2D software were carried out. The influence laws of the surrounding rock lithology, the vertical and horizontal distance between the roadway and overlying working face, the positional relationship between the roadway and the overlying working face, and the support form and strength of the rock surrounding an oblique straddle roadway were obtained. Within the range of mining influence, the properties of the rock surrounding the roof and floor were very different, and the deformation of the rock surrounding the two sides exhibited regional difference. The influence range of the mining working face on the rock floor of the roadway was approximately 30–40 m, and that of horizontal mining was approximately 50–60 m. The mining influence on the rock surrounding the side roadway of the working face is large, but the mining influence on the roadway below is small. Using FLAC2D, the stress and displacement characteristics of the rock surrounding the obliquely straddle roadway were compared and analyzed when the bolt support, combined bolt and shed support, and bolt–shotcreting–grouting support were adopted, the proposed support scheme of bolting and shotcreting was successfully applied. The deformation of the rock surrounding the roadway was satisfactorily controlled, and the results were useful as a reference for similar roadway maintenance projects.
Highlights
Underground mining is dominant in China’s coal mines
Dynamic pressure roadways account for 70–80% of coal mine roadways, among which the coal seam rock floor roadway is a typical dynamic pressure roadway [5,6,7,8]
After a floor rock roadway under an obliquely straddle working face is affected by the dynamic pressure of the overlying working face, owing to the change of the spatial relationship between the different areas of the roadway and the working face, the distribution of the stress field and the displacement field of the rock surrounding the roadway becomes more complex under the influence of the mining face, and the support difficulty increases [9,10,11]
Summary
As the lifeblood of underground coal mine production, roadways account for a large proportion of mine engineering [1,2,3,4]. Stricter requirements are proposed for the stability control of the rock surrounding a floor rock roadway under an obliquely straddle working face. The Pansan coal mine is located in the northwest part of Huainan City, Anhui the working face, different horizontal distance between the roadway and the working. The Dongsi face, different positional between the roadway the working face,main and transportation roadway of the Pansan coal mine is located in the floor rock of the 1762(3). −590under to −640 m, thesupport mining to compare andThe analyze the control of the surrounding different height is
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