自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

您目前所在的位置:首页 - 期刊简介 - 详细页面

中南大学学报(自然科学版)

Journal of Central South University

第48卷    第8期    总第276期    2017年8月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:1672-7207(2017)08-2203-07
水泥改良泥质板岩土路基模型动力响应试验
陈乐求1, 2,陈俊桦1,张家生1

(1. 中南大学 土木工程学院,湖南 长沙,410075; 2. 湖南理工学院 土木建筑工程学院,湖南 岳阳,414006)

摘 要: 为研究水泥改良的泥质板岩土路基的动力响应特性,结合工程实际在实验室内设计和建立足尺的水泥改良泥质板岩土路基模型和相应的路基动力加载系统,并且在路基内埋设动土压力盒、动应变计和振动速度传感器等测试元器件和布置竖向(沿深度方向)、横向测线。通过对路基模型进行循环动力加载与测试,获取路基横断面上的动力响应变化规律。研究结果表明:路基动应力、动应变和振动速度等动力响应量沿路基竖向和横向的衰减变化规律均相似;在动力加载作用点正下方的竖向测线上,动应力和动应变出现最大值,它们的竖向衰减系数也最大;随着与动力加载作用点横向距离增加,竖向测线上的动力响应强度逐渐降低,竖向衰减系数逐渐减小;动应力和动应变的横向衰减系数随深度增加而减小;加载频率对路基动力响应有较大影响;加载频率越大,路基动力响应越大;加载频率越大,路基动力响应衰减越快。

 

关键字: 土动力学;水泥改良土;路基足尺模型;动力响应;衰减规律

Experiments on dynamic response of cement-improved argillaceous-slate subgrade model
CHEN Leqiu1, 2, CHEN Junhua1, ZHANG Jiasheng1

1. School of Civil Engineering, Central South University, Changsha 410075, China; 2. Department of Construction & Engineering, Hunan Institute of Science and Technology, Yueyang 414006, China

Abstract:In order to research the dynamic response characteristics of cement-improved argillaceous-slate subgrade, full-scale subgrade model and dynamic loading system were designed and established based on practical engineering.Components for dynamic tests such as the earth pressure cell for dynamics, the strain gauge for dynamics and the vibration velocity sensor were embedded in the subgrade model. The measuring lines along vertical(depth direction) and transverse direction were designed. When the subgrade model was under cycle dynamic load, the test of dynamic responses of model was carried out. The results show that the dynamic response quantities such as the dynamic stress, the dynamic strain and the vibration velocity have the similar attenuation law along vertical and transverse direction. The maximum of the dynamic stress and the dynamic strain appear on the loading point. Under the loading point, the vertical attenuation of the dynamic stress and the dynamic strain both have the maximum value. Both the dynamic response intensity and the vertical dynamic attenuation index decrease with the increase of transverse distance to the center line of subgrade cross section. The transverse dynamic attenuation index of the dynamic stress and the dynamic strain decrease with the increase of the depth. The influence of frequency on dynamic response is great. The dynamic response intensity as well as the dynamic attenuation index increase, significantly with the increase of frequency.

 

Key words: soil dynamics; cement-improved soil; full-scale subgrade model; dynamic response; attenuation law

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
版权所有:《中南大学学报(自然科学版、英文版)》编辑部
地 址:湖南省长沙市中南大学 邮编: 410083
电 话: 0731-88879765(中) 88836963(英) 传真: 0731-88877727
电子邮箱:zngdxb@csu.edu.cn 湘ICP备09001153号