Dependence between goaf arching effect and its structure size under high stress

作者：Jiang, Lichun^*; Wang, Yudan; Zhao, Kui

来源：Journal of Central South University(Science and Technology), 2018, 49(10): 2576-2583.

DOI：10.11817/j.issn.1672-7207.2018.10.026

• Arch axis
• Dependency analysis
• High stress
• Internal forces
• Mechanical model
• Pillar spacing
• Span structures
• Surrounding rock

Based on the analysis of the destroying of surrounding rock of the roof, a roof-arch and rock-mechanical model was built. The internal force was calculated by fixed end arch algorithm. Deep mining goaf pillar width span structure and other factors were selected as dependency analysis index, and expressions of span(l) and pillar width(d) related to coefficient of arch axle(m) and height(h) of arch were deduced. Taking large metal deep mine under high stress of the stope as the object, relationship between goaf arch effect and structure size(l and d) was analyzed. The roof displacements were monitored in 150 d. The results show that when d is definite, l decreases with the decrease of m. When l is definite, d increases with the increase of m. The reasonable pillar spacing is 31 m when m=2, h=3 m and d=7 m. The max roof displacement deformation is less than 6 mm, and no collapse happens, while the stope of roof is safe during 150 d.It is reasonable to design a goaf structure under high stress at deep mine.

• 出版日期2018-10-26
• 单位华南理工大学