沿空留巷充填墙体与顶板运动的协调性研究
Coordination Study on Filling Wall and Roof Movement of Gob-side Entry Retaining
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摘要: 为解决沿空留巷充填墙体强度与顶板载荷之间的协调性问题，从采空区顶板结构与来压特点出发，分别阐述了沿空留巷直接顶与老顶的破断特征，认为老顶周期性“半OX”破断后在采场侧向形成的岩块及其结构平衡过程，是影响沿空留巷围岩稳定的关键。据此建立了沿空留巷围岩结构模型，得到了顶板运动初期和末期的墙体载荷。根据不同赋存条件下顶板的运动特征，将顶板运动中期的墙体载荷增长方式分为先快后缓型、均匀发展型和先缓后快型3种，顶板运动的任一时期墙体强度都应大于该时期顶板施加的载荷，从而保证墙体强度与顶板运动相协调。最后结合1个工程案例给出了验证。Abstract: In order to solve the coordination problem of filling wall strength and roof load of gob-side entry retaining, in the term of roof structure and weighting characteristics in goaf, failure characteristic is discussed respectively in gob side entry retaining of immediate roof and main roof, thinking that main roof periodic "half OX" failure in stope lateral formed rock block and structure equilibrium process, is key to influence gob-side entry retaining of surrounding rock stability. Hereby a surrounding rock structure model is established to obtain wall load at the beginning and end of roof movement. According to roof motion feature in different occurrence condition, wall load is divided into three mods: first fast and after slow, uniform development, first slow and after fast, in middle stage of roof movement. Wall strength should be more than roof load in any period of roof movement. Thus it ensures to coordinate wall strength with roof movement. Finally validation combining with an engineering case is presented.
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Keywords:
- roof load /
- surrounding rock stability /
- gob roof /
- motion feature /
- wall load
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