地震作用下地裂缝场地地表加速度响应的振动台试验研究

发布时间：2017-12-28 00:36

本文关键词：地震作用下地裂缝场地地表加速度响应的振动台试验研究　出处：《铁道学报》2015年12期 　论文类型：期刊论文

【摘要】：本文以西安地铁二号线穿越F6和F6'段地裂缝场地为原型,对水平地震作用下地裂缝场地地表加速度响应规律开展1∶15的振动台模型试验研究。试验时分别施加7种不同峰值加速度的El Centro波和Taft波激励,实测地裂缝场地表面6个测点的响应加速度值。试验结果表明:在El Centro波激励下,地裂缝场地地表响应加速度放大系数均大于1.0,但随着激励峰值加速度增大,放大系数以激励峰值加速度300gal为界呈"z"字形骤降;Taft波激励下,地裂缝场地表面响应加速度放大系数均大于1.0,但随着激励峰值加速度增大,放大系数以激励峰值加速度200gal为界呈两段折线形减小且渐趋平缓。在El Centro波和Taft波激励下,地裂缝场地表面的响应加速度放大系数均随着激励峰值加速度的增加而减小,但减小速率和变化形态因激励地震波不同而有差异。工程实践中,建议避免将工程结构布设于"y"形地裂缝间的楔形体中,或者采取切实有效的抗震或减震措施。
[Abstract]:Taking the ground fissure site of F6 and F6'section of Xi'an metro line two as a prototype, the shaking table test of 1 to 15 shaking table model is carried out for the ground acceleration response law under the horizontal earthquake. 7 different peak acceleration El Centro waves and Taft wave excitation were applied respectively in the test, and the response acceleration of 6 measuring points on the surface of the ground surface was measured. Experimental results show that the excitation of El Centro wave, the crack of ground surface response acceleration amplification coefficient is greater than 1, but with the increase of excitation peak acceleration, peak acceleration amplification coefficient to motivate 300gal for the sector was "Z" shaped sag; under Taft wave excitation, crack field response surface acceleration amplification coefficient is greater than 1. But with the increase of excitation peak acceleration, peak acceleration amplification coefficient to motivate 200gal for a two fold line shape and decreased slowly. Under the excitation of El Centro wave and Taft wave, the response acceleration amplification coefficient of ground fissure site decreases with the increase of the peak acceleration, but the reduction rate and the change form are different due to the difference of excitation seismic waves. In engineering practice, it is suggested to avoid the construction of the engineering structure in the wedge between "Y" shaped ground cracks, or to take effective and effective seismic or shock absorption measures.
【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】：国家自然科学基金(41072221,41202190) 中央高校基本科研业务费专项资金(2013G3282014)
【分类号】：TU435;U231.1
【正文快照】： 场地地震响应分析是地震工程、地学和土木工程领域的重要研究内容,地震工程学的研究手段主要有震害调查、数值模拟和振动台模型试验等。在中国地震局工程力学研究所的带领下,国内许多学者在断层场地的地震反应分析方面做了大量研究工作,并取得丰硕成果。有研究成果表明,发震断

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