动力扰动下含软弱夹层巷道围岩稳定性数值分析

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。

Numerical analysis of stability of roadway surrounding rock with weak interlayer under dynamic disturbance

In order to study the influence of weak interlayer of different thickness a, position h and an-gleθon the stability of surrounding rock of roadway under dynamic disturbance, numerical analysis of the mechanical response of roadway surrounding rock with weak interlayer under the action of stope blasting has been carried out using the finite element software ABAQUS, and the optimization support scheme has been put forward combing the practical conditions of roadway of Dongguashan Copper Mine. The results have shown that in conditions of dynamic disturbance:1) Both the stress and dis-placement have a non-linear relation with interlayer thickness a or position h upon the roof and two sides of roadway;the stability of the surrounding rock declines at first with the increase of a/h and then shows an up-going trend, which has indicated relative changes of the influence of a or h on secondary static stress of surrounding rock and dynamic disturbance attenuation. 2) With the increase of interlayer angleθ, the attenuation of the layer to dynamic wave rises up and then becomes more obvious whenθgrows larger. 3) The weak interlayer as an important role on the stability of roadway surrounding rock of Dongguashan Copper Mine, support measures and technical parameters can effectively control the deformation of surrounding rock, which has verified above results.