平底夯锤和异形夯锤强夯效果的对比研究

发布时间：2018-03-15 22:33

本文选题：强夯　切入点：平底夯锤　出处：《中北大学学报(自然科学版)》2016年06期 　论文类型：期刊论文

【摘要】：对夯锤底面的形状进行改进,在夯锤底面增加4个半球,形成了异形夯锤,开展1∶8黄土模型试验.从夯坑深度、加固深度、平均应变以及孔隙比四个方面研究了在异形夯锤作用之下强夯加固效果,并与普通平底夯锤强夯加固效果进行了对比.结果表明:在能级和夯击次数相同的情况下,平底夯锤重锤低落距的夯坑深度深于轻锤高落距的夯坑深度,异形夯锤轻锤高落距的夯坑深度深于重锤低落距的夯坑深度.在质量、高度和夯击次数相同的情况下,平底夯锤的加固深度深,加固效果均匀,异形夯锤的加固深度浅,加固效果不均匀,且集中在较浅的深度范围内.在加固深度范围内,异形夯锤作用下土体的平均应变大于平底夯锤作用下土体的平均应变.试验结果揭示了异形夯锤和平底夯锤在黄土地区加固时的特点,为黄土地区的工程设计和施工提供了有益的参考.
[Abstract]:The shape of the bottom surface of the rammer is improved by adding 4 hemispheres to the bottom surface of the rammer and forming a special rammer. A 1: 8 loess model test is carried out. The effect of dynamic compaction under the action of special-shaped rammer is studied from four aspects of average strain and void ratio, and the results are compared with those of ordinary flat bottom rammer. The results show that under the same energy level and the same number of tamping times, the reinforcement effect of dynamic compaction under the action of special-shaped rammer is studied. The depth of the rammer pit is deeper than that of the light hammer, the depth of the rammer pit is deeper than the depth of the rammer pit with the drop distance of the special shaped hammer, and the depth of the rammer pit is deeper than the depth of the rammer pit with the lower distance of the heavy hammer. When the quality, height and times of tamping are the same, The reinforcement depth of flat rammer is deep, the reinforcement effect is uniform, the reinforcement depth of special-shaped rammer is shallow, the reinforcement effect is not uniform, and it is concentrated in the shallow depth range. The average strain of soil under the action of special-shaped rammer is greater than that of soil under the action of flat rammer. The experimental results reveal the characteristics of special-shaped rammer and flat-bottom rammer in the reinforcement of loess area. It provides a useful reference for engineering design and construction in loess area.
【作者单位】：中北大学理学院;
【基金】：国家自然科学基金资助项目(51208473) 山西省科技攻关项目(20130313010-3)
【分类号】：TU472.31

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