深井巷道两帮锚固体作用机理及稳定性分析

Stability analysis and mechanism of two-side anchorage body in deep mine gateway

通过对深井巷道两帮锚固体破坏特征及作用机理分析,锚固体最大破坏部位在两帮偏中上部,两帮锚杆支护的作用就是使锚杆与锚固范围内岩体相互作用形成锚固承载结构体。把深井巷道两帮锚固体失稳分为压裂失稳和剪切失稳,两帮锚固体首先失稳形态为压裂失稳,建立了巷道两帮锚固体2种失稳条件下的稳定性力学模型,提出了锚杆、锚索耦合支护方案,并对试验巷道两帮稳定性进行了力学计算、数值分析及现场观测,回采巷道两帮采用支护设计方案后,两帮收敛量减小,最大移近量124 mm,控制在合理范围内,两帮围岩稳定,支护效果显著。

Through analysis of failure characteristic and mechanism on two-side anchorage body in deep mine gateway, we get most serious failure spot of two sides in middle-upper part. Bolting function is to form anchorage body structure because of the force between bolt and rock in anchorage range. The instability of two-side anchorage body in deep mine gateway is divided into fracturing and shearing in- stability, and first instability form of two-side anchorage body is fracturing instability. The paper es- tablishes stability mechanical model of two-side anchorage body in deep mine gateway under two insta- bility forms, which provides bolt and cable couple-support scheme and carries out mechanical calcula- tion, numerical analysis and field observation on test gateway. After carrying out support design scheme on gateway two sides, two-side convergence amount decreases. The largest displacement amount is 124 mm, which is controlled in reasonable range. Two-side surrounding rock is stable, and the support effect is remarkable.