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为探究地铁交叉结构地震响应规律,以常见的双隧道下穿单层车站结构为背景进行地震反应振动台试验,试验模型箱采用柔性箱,结构为微粒混凝土浇筑,并按实例工程配筋率用镀锌钢丝网进行配筋,考虑上下结构密贴、上下结构存在夹层土及单体车站三种工况进行水平方向加载,通过对交叉工况与单体车站结构应变、侧墙土压力及加速度反应分析对比,底部隧道结构的存在对传来的地震波具有吸收作用,使上部车站的地震响应减弱,减幅随夹层土体厚度的增加而减小。
In order to explore the earthquake response law of subway cross structure, seismic response shaking table test is carried out under the background of common double-track underpass single-story station structure. The test model box is made of flexible box and the structure is concrete pouring. According to the example, Galvanized steel mesh reinforcement, consider the close up and down the structure, the upper and lower structure of the existence of sandwich soil and single station load in the horizontal direction of three conditions through the cross-site structure and single station structure strain, wall pressure and acceleration The analysis and comparison of the responses shows that the existence of the tunnel structure at the bottom absorbs the seismic waves from the ground and weakens the seismic response of the upper station, decreasing with the increase of the thickness of the interlayer soil.