摘要
开展了4种不同深度(30,60,100和150 cm)和4种不同工况作用下液压夯实机处理高速公路台背的现场试验,并基于ADINA有限元分析软件建立模型对此进行了模拟研究。研究结果表明:在夯实过程中,应力从夯实区向下呈"八"字型传播,影响深度1 m以上,水平方向影响范围较小;在压力区内夯击荷载对桥台结构物影响较大,但应力小于规范规定值;在碎石与混凝土结构2种强弱材料接触面设置接触单元后,接触面的位移和应力分布更接近实际,接触面拐角有明显的应力集中。实测值和计算值部分数据吻合较好,并具有一定的规律。该试验成果和数值模拟研究可为公路台背加固工程提供重要的参考。
Field test was carried out to study expressway retailing backwall treated by hydraulic compaction con-sidering four different depths（30,60,100,150 cm） and four different working conditions, and numerical simula-tion study by using finite element method based on ADINA was also introduced for comparision. The results show that the stress propagation is like ＂eight＂ from compaction area to down during hamming, and the depth of im-paetion is above 1 m but the impaction scope of horizon is not very large. The impact load has a great effect on bridge abutment structure in pressure area, but stress value is less than the norm of value. The stress and dis- placement distribution of the interface are much closer to reality while setting contact elements in interface of two strong and weak materials of crushed stone and concrete structure, and the corner of interface obviously shows stress concentration. A part of measured value and calculated value match exactly, and have a certain rules. The results of the field test and the numerical simulation study can provide important reference value to strengthening engineering of road retailing backwall.
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2013年第1期49-54,共6页
Journal of Railway Science and Engineering
基金
湖南省交通科技进步与创新计划项目(200910)
关键词
液压夯实
台背
现场试验
数值模拟
接触单元
hydraulic compaction
retailing backwall
field test
numerical simulation
contact elements
