灌注桩套管振动贯入引起的地面振动及隔振研究

发布时间：2018-01-23 00:29

本文关键词： 灌注桩套管振动贯入地面振动有限元隔振沟　出处：《岩土力学》2017年03期 　论文类型：期刊论文

【摘要】：随着全套管振动取土灌注桩施工工艺的发展,灌注桩在工程中的应用越来越广泛,但关于灌注桩套管振动贯入机制,特别是套管贯入引起的地面振动研究还不全面。在全面介绍了套管振动贯入全过程的有限元-无限元耦合模型的建立过程后,对套管振动贯入引起的地面振动规律及施工安全距离进行了详细研究。采用正交试验与数值模拟相结合的正交有限元法评价了各因素对施工安全距离的影响程度。研究结果表明:套管贯入过程中,地面振动主要沿水平向;在套管贯入初期,地面不会产生水平向峰值速度,当套管贯入到振动临界深度时,地面产生水平向峰值速度;地面水平向峰值速度随径向距离增大呈指数型衰减;施工安全距离随动力荷载幅值、接触面摩擦系数增大而增大,随振动频率、土体模量增大而减小。研究了隔振沟的填充材料、深度和宽度对隔振效果的影响,结果表明,无填充料的隔振沟隔振效果最好;隔振沟的宽度对隔振效果影响不大,其深度对隔振效果影响显著。
[Abstract]:With the development of the construction technology of the whole set of tube-vibration earth-filling pile, the application of the cast-in-place pile in the engineering is more and more extensive, but the mechanism of the casing vibration penetration of the cast-in-place pile is concerned. Especially, the research on surface vibration caused by casing penetration is not comprehensive. After introducing the whole process of casing vibration penetration, the finite element coupled finite element model is established. The rules of ground vibration caused by casing vibration penetration and the safety distance of construction are studied in detail. The influence of various factors on construction safety distance is evaluated by using orthogonal finite element method combined with orthogonal test and numerical simulation. ... the results of the study indicate that:. Casing penetration process. The ground vibration is mainly horizontal. At the initial stage of casing penetration, the horizontal peak velocity does not occur on the ground, and when the casing penetrates to the critical depth of vibration, the horizontal peak velocity occurs on the ground. The horizontal peak velocity of the surface attenuates exponentially with the increase of radial distance. The safe distance of construction increases with the amplitude of dynamic load, the friction coefficient of contact surface increases, and decreases with the increase of vibration frequency and soil modulus. The effect of filling material, depth and width of isolation ditch on vibration isolation effect is studied. The results show that the vibration isolation ditch without filling material has the best vibration isolation effect. The width of the isolation ditch has little effect on the isolation effect, but its depth has a significant effect on the isolation effect.
【作者单位】：福州大学土木工程学院;
【基金】：国家自然科学基金项目(No.41272299)~~
【分类号】：TU473.1;TU435
【正文快照】： 灌注桩不受土层变化限制,可根据土层分布情况任意变化桩长,容易适应持力层高低不平的变化,不需要接桩和截桩,节约钢材、振动小、噪声小、承载力高,适用于高层建筑、桥梁工程及港口工程的基础[1]。随着全套管振动取土灌注桩施工工艺的发展,灌注桩在实际工程中得到越来越广泛的

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