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以大开地铁车站为工程背景,采用数值模拟方法,以中柱层间位移角为评价指标,在弹性土体与弹性结构接触、弹塑性土体与弹性结构接触、弹塑性土体与弹塑性结构接触三种工况下分别计算接触面为绑定、接触面摩擦系数为0.2和0.4时的结构地震反应,同时考虑结构-土体的相对模量对接触特性的影响。提取峰值加速度时刻、峰值位移时刻和峰值速度时刻中结构变形程度最大的时刻,将接触面为摩擦设置时的中柱层间位移角与绑定连接条件下的层间位移角数值进行对比分析。结果表明:当材料力学特性不同时,接触特性对结构反应的影响程度也不同。改变结构的埋深,研究不同围岩约束能力下接触特性对地下结构地震反应的影响,结果表明浅埋时接触特性对地下结构地震反应影响程度较大,深埋时影响程度较小,且对于浅埋结构,峰值加速度时刻为结构地震反应最大时刻,对于深埋结构,峰值位移时刻为结构地震反应最大时刻。
Taking the subway station as a background, the numerical simulation method and the displacement angle between the middle columns were used as the evaluation indexes. When the elastic soil is in contact with the elastic structure and the elastic-plastic soil is in contact with the elastic structure, the elastic-plastic soil and elasto-plasticity Under the three conditions of structure contact, the seismic response of the structure with the contact surface bounding and the contact surface friction coefficient of 0.2 and 0.4 are respectively calculated, and the influence of the relative modulus of the structure-soil body on the contact characteristics is also considered. At the time of extracting the peak acceleration, the peak displacement time and the peak velocity moment, the displacement angle between the middle column and the drift angle under the bounding connection condition when the contact surface is in friction setting is compared. The results show that when the mechanical properties of materials are different, the influence of contact characteristics on the structural response is also different. The influence of the contact characteristics of different surrounding rock on the seismic response of underground structures is studied. The results show that the contact characteristics at shallow depth have a greater influence on the seismic response of underground structures and less on the depth of buried structures. Shallow burial structure and peak acceleration time are the maximum moments of seismic response. For deep buried structures, the peak displacement moment is the maximum moment of seismic response.