锯末混合土场地模型振动台试验研究

发布时间：2018-01-07 09:40

本文关键词：锯末混合土场地模型振动台试验研究　出处：《岩土工程学报》2017年11期 　论文类型：期刊论文

【摘要】：在北京工业大学九子振动台台阵系统上开展了一系列锯末混合土场地模型试验,试验中模型箱采用装配式连续体刚性模型箱,其尺寸为7.7 m(长)×3.2 m(宽)×1.2 m(高),输入地震动时程采用El Centro地震动记录和天津地震动记录,地震动输入方向为水平横向和水平纵向。通过场地模型振动台试验,验证了设计的模型箱的较小的"边界效应"影响程度,同时考察了锯末混合土场地模型的动力特性及其变化规律。对部分试验结果,包括场地反应的地震动峰值加速度及其动力放大系数、加速度时程及其频谱,进行了具体分析。试验结果表明:本次使用的装配式连续体刚性模型箱边界效应处理效果良好,同一水平面上不同部位土体反应的加速度仅有较小差异;随着地震动输入强度的增大,同一测点反应的峰值加速度总体上在增大,但其加速度动力放大系数总体上呈现减小的趋势,反应的频谱组成从较高频率向较低频率移动。这些结果说明,随着地震动输入强度的增大,土体由于刚度发生变化而相对变软,土体模量逐渐降低。
[Abstract]:At the Beijing University of Technology nine shaking table array system to carry out a series of sawdust mixed soil model test, model test of the assembled continuum rigid model box, its size is 7.7 m (long) x 3.2 m (wide) x 1.2 m (high), the input ground motions using El Centro motion records ground motion records and Tianjin, seismic input direction of the horizontal and vertical level. Through the shaking table model test site, verify the design of the model box of the smaller "edge effect" influence, also examines the dynamic characteristics and variation of sawdust mixed soil site model. On the part of the test results, the peak acceleration and the dynamic magnification factor including the site response of ground motion, acceleration and spectrum are analyzed. The experimental results show that the use of prefabricated continuum rigid model box boundary effect processing effect is good. Well, only a small difference between different parts of the soil and the acceleration response of the same level; with the input of earthquake intensity increases, the same measuring point response peak acceleration in the overall increase, but the acceleration dynamic magnification coefficient decreases, the frequency response spectrum composition moves from high frequency to lower frequency these results indicate that with the input ground motion intensity increases, because the soil stiffness changes and relatively soft soil modulus decreased gradually.

【作者单位】：中国地震局地球物理研究所;北京工业大学工程抗震与结构诊治北京市重点实验室;
【基金】：北京市自然科学基金项目(8164067) 国家自然科学基金项目(51708519,51578514,51508526) 中国地震局地球物理研究所基本科研业务专项项目(DQJB15B10)
【分类号】：TU435
【正文快照】： Engineering and Structural Retrofit,Beijing University of Technology,Beijing 100124,China)振动台试验是研究地震工程问题的重要手段,在岩土工程抗震领域得到广泛应用的有普通振动台试验和离心机振动台试验[1]。离心机试验模型尺寸较小,试验结果易受边界效应的影响。振

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