基于围岩结构沿空掘巷围岩控制及支护分析

Analysis on the Surrounding Rock Control and Support of Gob Side Entry Driving Based on the Structure of Surrounding Rock

根据沿空掘巷大、小结构的稳定性原理,分析了关键块体在掘巷前后应力分布规律及窄煤柱巷道围岩变形破坏机制,认为沿空掘巷围岩控制的关键是保证窄煤柱具有一定的稳定极限核区,支护结构和围岩形成的承载体要在适应大结构变形的特征下保持一定的稳定性,着重阐述了高预紧力、高延伸率锚索在沿空掘巷中的作用。基于此,针对具体工程情况提出了高预应力锚杆索联合强力让压支护方案,并成功应用于工程实践。

According to the stability principle of big and small structures of gob side entry driving, the stress distribution regularities of key blocks before and after entry driving and deformation and failure mechanisms of surrounding rock of roadways with narrow coal pillar are analyzed. It is considered that the key to surrounding rock control of gob side entry driving is to ensure certain stability limit core area of narrow coal pillars, and maintain certain stability of the carrier formed by supporting structure and surrounding rock adapting to the characteristics of large structural deformation. The effect of anchor wires with high pretightening force and high elongation in gob side entry driving is focused on. Based on this, strong decompressing supporting program by combining high prestressed anchor ropes and anchor rods is proposed for specific situation of projects, which has been successfully applied to engineering practice.