EPS颗粒-黄土混合土减震层对黄土地区隧道衬砌结构的减震作用

发布时间：2018-08-13 19:41

【摘要】：为了分析聚苯乙烯泡沫塑料(EPS)颗粒-黄土混合土减震层在不同条件下对隧道衬砌结构减震效果的影响,采用通用有限元软件ANSYS建立了在隧道支护体系内设置减震层的数值模型,分析了EPS颗粒掺入比、减震层厚度及地震动强度对隧道衬砌结构动力响应规律的影响。结果表明:设置减震层可以减小传递至隧道衬砌结构的地震能量,从而使得隧道衬砌结构各关键点正应力、剪应力、最大主应力、位移及加速度峰值均有所减小,且一定范围内随着EPS颗粒掺入比的增大,减震效果逐渐明显;减震层的厚度控制在30~50cm区间内时减震效果最佳;减震层在强震作用下的减震效果更好,该混合土减震层更适合高烈度地震区的抗减震;所得结论可为今后在土体环境尤其是黄土地区开挖的隧道衬砌结构抗减震工程建设提供一定参考。
[Abstract]:In order to analyze the influence of polystyrene foamed (EPS) particle and loess mixed soil damping layer on the damping effect of tunnel lining structure under different conditions, a numerical model for setting up damping layer in tunnel support system was established by using the universal finite element software ANSYS. The influence of EPS particle ratio, thickness of damping layer and intensity of ground motion on the dynamic response of tunnel lining structure is analyzed. The results show that the seismic energy transferred to the tunnel lining structure can be reduced by setting the damping layer, and the normal stress, shear stress, maximum principal stress, displacement and acceleration peak value of every key point of the tunnel lining structure can be reduced to some extent. In a certain range, with the increase of the ratio of EPS particles, the damping effect is gradually obvious; the damping effect is the best when the thickness of the damping layer is controlled in the 30~50cm region; the seismic absorption effect of the damping layer is better under the action of strong earthquake, and the damping effect is better when the thickness of the damping layer is controlled in the 30~50cm region. The results can be used as a reference for the construction of the tunnel lining structure in the soil environment, especially in the loess area in the future.
【作者单位】：长安大学建筑工程学院;长安大学地下结构与工程研究所;
【基金】：陕西省自然科学基础研究计划项目(2016JM4103) 中央高校基本科研业务费专项资金项目(310828163409)
【分类号】：U451.4

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