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地应力对深部地下洞室围岩的稳定性有很大程度的影响,其中水平地应力分量起关键作用。针对下向进路侧帮可动块体的形成条件及受力状态,利用矢量分析及力学计算,提出了考虑水平地应力的可动块体稳定性系数的计算方法。在此基础上,分析了最大水平主应力方向与进路方向呈不同交角时,主应力对可动块体稳定性的影响。分析表明,在一定的块体形成条件下,水平主应力对可动块体稳定性的影响与水平主应力的作用方向密切相关。随着最大水平主应力方向与进路方向交角的增大,主应力对可动块体稳定性的影响程度逐渐减小,交角在0~30°之间变化时,块体稳定性系数减少较快,随交角的增大,块体稳定性系数变化趋于平缓。将本计算方法应用于工程实践中,取得了良好效果。
Geostress has a great impact on the stability of surrounding rock in deep underground cavern, in which horizontal stress component plays a key role. According to the forming condition and the force state of the movable block on the side of the approach road, the calculation method of the stability coefficient of the movable block considering the horizontal stress is proposed by means of vector analysis and mechanical calculation. On this basis, the influence of the principal stress on the stability of the movable block is analyzed when the direction of the maximum horizontal principal stress is different from the direction of the approach. The analysis shows that the influence of the horizontal principal stress on the stability of the movable block is closely related to the action of the horizontal principal stress under certain block formation conditions. With the increase of the intersection angle between the direction of maximum principal stress and the direction of entry, the effect of principal stress on the stability of movable block gradually decreases. When the crossing angle changes from 0 ° to 30 °, the stability coefficient decreases Fast, with the increase of angle, the stability of the block coefficient changes tend to be gentle. This method is applied to engineering practice and achieved good results.