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水平构造应力是影响巷道围岩稳定的重要因素之一,通过相似材料模拟试验和数值模拟方法研究不同水平应力作用下锚杆支护巷道以及无支护条件下巷道围岩变形破坏特征.物理模拟较好的反映了巷道顶板的冒落和底板的鼓起状况,数值模拟反映巷道周围塑性范围和应力分布.模拟结果表明,随着水平应力增加,水平应力向巷道顶底板深部传递的趋势明显,导致巷道底鼓及褶皱形破坏,顶板剪切变形及楔形冒落.顶底板变形破坏大于巷道两帮的变形破坏.因此,高水平应力作用下,巷道顶底板是巷道控制的重点.锚网索喷一次支护配合长环形U钢支架二次支护是解决高水平应力作用下巷道支护的有效手段之一.
The horizontal tectonic stress is one of the important factors that affect the stability of roadway surrounding rock, and the deformation and failure characteristics of surrounding rock of the roadway under the condition of different horizontal stress and under the condition of no support are studied through the simulation experiment of similar material and numerical simulation. Which reflects the roof of the roadway and the bulge of the floor well.The numerical simulation reflects the plastic range and the stress distribution around the roadway.The simulation results show that the horizontal stress has a clear tendency to transmit deep to the roof and floor of the roadway as the horizontal stress increases, Leading to the destruction of the bottom drum and fold of the roadway, the roof shear deformation and wedge-shaped falling.The deformation of the roof and floor is more than the deformation and destruction of the two gangways.Therefore, under the action of high horizontal stress, the roof and floor of the roadway is the key point of the roadway control. Spray a support with a long ring U steel support secondary support is to solve the high level of stress under the effective support of the roadway.