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为了研究动力扰动下不同厚度a、位置h和倾角θ的软弱夹层对巷道围岩稳定性的影响,利用有限元软件ABAQUS对含有夹层巷道受到采场爆破作用下围岩的力学响应进行数值分析,并结合冬瓜山铜矿深部出矿巷道实际提出支护优化方案。结果表明,动力扰动下:1)巷道顶板和两帮应力、位移与夹层厚度a或位置h呈非线性变化关系,围岩的稳定性随着a或h的增加先减小后增大,说明了厚度a或位置h对围岩次生静应力和动力扰动衰减的影响程度的相对变化;2)随着软弱夹层倾角θ增大,夹层对动力波的衰减作用增大,夹角较大时,对动力波的衰减作用更显著;3)软弱夹层对冬瓜山铜矿出矿巷道围岩的稳定性起重要作用,支护措施和技术参数优化可有效控制围岩变形,验证了上述研究的正确性。
In order to study the influence of soft interlayer with different thickness a, position h and inclination θ on the stability of surrounding rock under dynamic disturbance, numerical analysis of the mechanical response of surrounding rock containing interlayer tunnel under blasting is carried out by finite element software ABAQUS. In combination with the deep demineralization tunnel in Dongguashan Copper Mine, the optimization scheme of support is put forward. The results show that under the dynamic disturbance: 1) the stress and displacement of the roof and the two sides of the roadway have a non-linear relationship with the thickness a or position h of the interlayer; the stability of the surrounding rock first decreases and then increases with the increase of a or h, indicating The relative change of the influence degree of thickness a or position h on the secondary static stress and dynamic disturbance attenuation of the surrounding rock; 2) As the inclination angle θ of the weak interlayer increases, the damping effect of the interlayer on the dynamic wave increases; , Which have a more significant attenuation effect on the motive waves. 3) The weak interbed plays an important role in the stability of surrounding rock in the mine roadway in Dongguashan copper mine. The support measures and optimization of technical parameters can effectively control the deformation of surrounding rock. Correctness