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.
On the improvement of the shape of bottom surface of hammer,the four hemispheres are added in the bottom surface of the hammer,the special shaped hammer is formed,and the 1∶8loess model test is carried out.The effect of dynamic compaction is studied from four aspects of the depth of the pit,the depth of the reinforcement,the average strain and the void ratio,compared with that of the flat bottom hammer.The results show that for flat bottom hammer,the depth of tamping pit under heavy hammer is deeper than light hammer under the action of the same level and the same tamping blow number;for special hammer,which is contrary.With the same weight and temping number,the reinforced depth is deeper and the effect of reinforcement is even compared with special shaped hammer,and the effect of reinforcement focused on shallow soil.In the scope of the reinforcement depth,the average strain of the soil under the action of the special shaped hammer is larger than the average strain of the soil under the flat bottom.The test results reveal the characteristics of reinforcement under the special shaped hammer and flat bottomed hammer in the loess area,which provides useful reference for the engineering design and construction of the loess area.
出处
《中北大学学报（自然科学版）》
CAS
北大核心
2016年第6期654-658,共5页
Journal of North University of China(Natural Science Edition)
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)
关键词
强夯
平底夯锤
异形夯锤
黄土
加固
dynamic compaction
flat bottom hammer
special shaped hammer
loess
reinforcement
