黄土与地铁车站动力相互作用模型的水平位移及沉降分析

发布时间：2018-02-01 21:15

本文关键词： 黄土地区地铁车站振动台试验动土压力水平位移沉降分析　出处：《振动与冲击》2017年17期 　论文类型：期刊论文

【摘要】：在黄土场地条件下进行土与地铁地下结构动力相互作用振动台试验。基于实测数据对黄土与地铁车站接触动土压力、模型地基竖向沉降及水平位移进行分析,对试验中模型地基地震破坏特点进行描述。结果表明:结构侧面顶部动土压力大于中部和下部,随输入峰值加速度的增大结构侧面土压力均增大;地震动较大时,地基层间剪切位移呈现顶部最大,底部次之,中部最小;地表沉降随输入峰值加速度的增加而增大,西安人工波作用下地表沉降大于松潘波和Taft波作用下沉降;结构上方地表沉降始终小于周围土层,表明结构发生相对上升运动;分析发现,结构顶、底动土压力差提供结构上升运动的内在动力。回归分析表明,地基水平相对位移与土层深度可用三次多项式拟合,两者之间具有较好的相关性。
[Abstract]:The shaking table test of dynamic interaction between soil and subway underground structure is carried out under the condition of loess site. Based on the measured data, the vertical settlement and horizontal displacement of the model foundation are analyzed based on the contact dynamic earth pressure between loess and subway station. The results show that the dynamic earth pressure at the top of the structure side is greater than that in the middle and lower parts, and the lateral earth pressure increases with the increase of the input peak acceleration. When the ground motion is larger, the shear displacement between the ground base is the largest at the top, the next at the bottom, and the smallest at the middle. The surface subsidence increases with the increase of the input peak acceleration. The surface subsidence under the action of Xi'an artificial wave is larger than that of Songpan wave and Taft wave. The surface settlement above the structure is always smaller than that of the surrounding soil layer, which indicates that the structure has a relative upward movement. It is found that the difference of the dynamic earth pressure between the top and the bottom of the structure provides the inherent motive force for the rise of the structure. The regression analysis shows that the horizontal relative displacement of the foundation and the depth of the soil layer can be fitted by cubic polynomial. There is a good correlation between the two.
【作者单位】：长安大学建筑工程学院;中国地震局地球物理研究所;
【基金】：国家自然科学基金(41472267) 中央高校基本科研业务费专项(310828171010) 西安市地下铁道有限责任公司科研基金(D4-YJ-042014048)
【分类号】：TU435;U231
【正文快照】： 随着我国西部黄土地区地铁工程逐渐增多,黄土地区地铁地下结构的抗震性能及安全性评价日益受到密切关注[1]。由于黄土具有柱状节理、大孔隙、弱胶结的特殊结构性及对水的特殊敏感性[2],使得黄土地区震害相对其它土类要严重的多。动力、静力及浸水作用分别引起黄土震陷、压密及

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