煤层巷道两帮煤体应力和极限平衡区的探讨

STRESS IN IN-SEAM ROADWAY SIDES AND LIMIT EQUILIBRIUM ZONE

本文介绍了国内外学者对煤层巷道两帮煤体应力及极限平衡区的研究成果,指出了研究中存在的问题。作者以松散介质应力平衡理论为基础,井结合应力微分平衡方程求出了煤层界面应力以及煤体的应力极限平衡区宽度。文中分析了开采深度、界面摩擦角、粘聚力、煤层厚度、侧向支护阻力、应力集中系数等因素对界面应力和极限平衡区宽度的影响。井下实测数据与计算结果基本吻合。

The paper describes results of research on stresses in roadway sides and limit equilibrium zone conducted by researchers both at home and abroad,and points out the existing problems.Based on stress equilibrium theory of loosed material, using stress differential equilibrium equations,the authors obtained seam inter- face stress and width of stress limit equilibrium zone in solid coal.The paper analyzes the effect of factors,like mining depth,interface frictional angle, cohe- sion,seam thickness,lateral supporting resistance,stress concentration coefficient on interface stress and width of limit equilibrium zone.The underground measured data basically fit to the calculated data.