Numerical modeling for further understanding of roadway junction stability behaviour at deep underground

• Published in: Journal of coal science & engineering, China Vol. 14; no. 1; pp. 38 - 43
• Main Author: 陆庭侃 郭保华 程立朝
• Format: Journal Article
• Language: English
• Published: Heidelberg China Coal Society 01.03.2008
• Subjects: Earth and Environmental Science; Earth Sciences; Geochemistry; Geology; Geophysics/Geodesy; Geotechnical Engineering & Applied Earth Sciences; Mechanical Engineering; 开采技术; 数字模拟技术; 稳定性; rock mechanics; strata control; roadway junction; numerical analysis
• ISSN: 1006-9097; 1866-6566
• DOI: 10.1007/s12404-008-0008-2

The review and numerical analysis had been conducted further understand the deformation and failure beahviour of roadway junctions, associated with the different geometrical characteristics, various depth of cover, different mechanical properties around the junction and different construction sequences as well as different construction ad- vances during the roadway junction construction. The results confirme that the simple un- derground structure is more stable than complicated structures, and comparing with different geometrical shapes of the two-dimensional roadway junctions, the most unstable one is the four way cross junction, which is the most commonly used in coal mines. On the other hand, the stability of the junction is not linearly related to the depth of cover, the significant effect only occurred when the depth of cover reached to 1 000 m. Also, with grad- ual degradation of rock mass, the deformation and failure around the junction increased significantly and nonlinearly. The modeling also conductes on the construction sequence for the junction, it is suggested that, during the junction construction, all the additional roadway should be constructed with the direction of moving away from, rather than forward to the junction. Finally, the construction advance is also considered for the junction development. It is suggested that when the construction is carried out around the junction, a small excavation advance, such as 1 m or 2 m is adopted for keeping small interruption on the existed roadway or junction.