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中南大学学报(自然科学版)

Journal of Central South University

第51卷    第9期    总第313期    2020年9月

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文章编号:1672-7207(2020)09-2571-09
交通荷载作用下粗粒土高路堤动力特性分析
何忠明1, 2,邱俊筠2,柯唯2,范电华2

(1. 长沙理工大学 特殊环境道路工程湖南省重点实验室,湖南 长沙,410114;
2. 长沙理工大学 交通运输工程学院,湖南 长沙,410114
)

摘 要: 为了研究粗粒土高路堤在长期交通荷载作用下动力响应特性及应力场演变规律,基于相似理论,进行室内动力模型试验。试验中,将交通荷载按比例进行缩减,通过动力模拟装置施加在路堤模型上;利用MIDAS/GTS软件建立粗粒土高路堤数值模型,通过模型试验结果与数值计算结果对比分析,探讨粗粒土高路堤在交通荷载作用下的动力特性。研究结果表明:路堤产生的动应力、位移能表征轴载相互叠加的特性;在路堤同一深度处,交通荷载对车轮正下方的路堤土体动应力响应影响程度最大,车辆载重对路堤影响程度显著高于车速对路堤的影响程度;在路堤不同深度处,动应力出现明显滞后,动应力曲线呈非线性衰减变化特征;路堤在循环荷载作用下,累积变形规律分为平缓增加、急剧上升、缓慢上升和趋于稳定阶段。

 

关键字: 粗粒土高路堤;交通荷载;动力响应;动力模型试验

Analysis of dynamic characteristics of coarse-grained soil high embankment under traffic load
HE Zhongming1, 2, QIU Junjun2, KE Wei2, FAN Dianhua2

1. Key Laboratory of Special Environment Road Engineering of Hunan Province, Changsha University of Science & Technology, Changsha 410114, China;
2. School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha 410114, China

Abstract:In order to study the dynamic response characteristics and stress field evolution law of coarse-grained soil high embankment under long-term traffic load, based on the similar theory, an indoor dynamic model test was carried out. In the test, the traffic load was reduced by a ratio and applied in the embankment model through a dynamic simulation device. The numerical model of coarse-grained soil high embankment was established by using MIDAS/GTS software.Through comparative analysis of the test results and theoretical calculation results, the dynamic characteristics of the coarse-grained soil high embankment under the action of traffic loads were discussed. The results show that the dynamic stress and displacement generated by the embankment reflect the characteristics of superimposed front and rear axial loads. At the same depth of the embankment, the traffic load has the greatest influence on the dynamic stress response of the embankment soil directly below the wheel. The impact of vehicle load on the embankment is significantly higher than that of vehicle speed on the embankment. At different depths of the embankment, the dynamic stress displays obvious hysteresis, and the dynamic stress curve has nonlinear variation characteristics of attenuation. Under cyclic loading, the cumulative deformation law of the embankment is divided into four phases, i. e. a gentle increase, a sharp rise, a slow rise and a stabilization phase.

 

Key words: coarse-grained soil high embankment; traffic load; dynamic response; dynamic model test

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
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