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为有效避免地震作用下边坡的共振现象,将含有控制结构面的顺层边坡简化为单一节理边坡模型,采用ANSYS软件对简化模型进行模态分析和谐响应分析。结果表明,随着节理结构面剪切刚度的增大,边坡的一阶振型由沿结构面的错动振动变为水平振动,且临界剪切刚度为0.5 GPa/m。当边坡岩石弹性模量由20GPa增加到50 GPa时,临界剪切刚度增加。地震作用下只有边坡的第一阶自振能被激发产生水平方向共振现象,结构面的存在能减小边坡的一阶自振频率,使边坡的自振频率更接近地震波的主频,更易产生共振,可通过支护方式增加边坡节理剪切刚度来控制地震作用下边坡的共振现象。
In order to effectively avoid the resonance phenomenon of the slope under the earthquake, the bedding slope with the control structural plane is simplified as a single joint slope model. The ANSYS software is used to analyze the modal and harmonic response of the simplified model. The results show that with the increase of the shear stiffness of the joint structure, the first-order mode of the slope changes from horizontal vibration to horizontal vibration, and the critical shear stiffness is 0.5 GPa / m. When the elastic modulus of slope rock increases from 20 GPa to 50 GPa, the critical shear stiffness increases. Only the first-order natural vibration of the slope can be excited to produce the horizontal resonance under the action of earthquake. The existence of the structural plane can reduce the first-order natural frequency of the slope and make the natural frequency of the slope closer to the dominant frequency of the seismic wave , It is easier to produce resonance. The shearing rigidity of slope joints can be increased by means of support and the resonance phenomenon of slope under earthquake action can be controlled.