论文部分内容阅读
以矿山垂直交岔点为工程背景,通过VB编程对数值分析结果进行二次处理,揭示了与地应力存在不同空间位置关系的垂直巷道交岔点的扰动主应力矢量分布规律(主应力的大小变化和方向偏转);并引入点安全系数法,研究了垂直巷道交岔点围岩变形量和松动圈范围随交岔点空间位置变化的规律。结果表明:扰动主应力矢量主要受原岩主应力的影响,而几乎不受交岔点与地应力空间位置和巷道开挖顺序的影响,扰动主应力由浅部至深部先增加后减小,交岔点顶底板和两帮的最大扰动主应力分别为水平应力和垂直应力;垂直交岔巷道轴线越靠近两水平主应力法向平分线,交岔点围岩变形量和扰动屈服范围越小、围岩稳定性越高,且先开挖更靠近最大水平主应力方向的巷道对交岔点围岩的扰动影响更小。
Based on the vertical intersection of the mine as the engineering background, the results of the numerical analysis were processed by VB programming to reveal the distribution of the principal stress vector perturbations of the vertical roadway intersections with different spatial positions (the magnitude of principal stress Change and direction of deflection). The method of point safety factor was introduced to study the variation of surrounding rock deformation and the range of loose ring with the change of the spatial position of the crossing point. The results show that the principal stress of disturbance is mainly affected by the principal stress of the original rock and is hardly affected by the spatial position of the intersection and the stress of excavation and the sequence of tunnel excavation. The principal stress of disturbance increases first and then decreases from shallow to deep, The main disturbed principal stress of bifurcation top floor and two gangs are horizontal stress and vertical stress respectively. The axis of vertical turnout is closer to the normal bisector of the two levels of principal stress, the smaller the deformation and the yielding range of the surrounding rock of the crossing point, The higher the stability of surrounding rock is, and the effect of excavation of the roadway closer to the maximum horizontal principal stress on the disturbance of the surrounding rock at the crossing point is less affected.