摘要
为合理设计和建造低路堤,提高低路堤使用寿命,探究荷载作用下的动力响应规律。运用标准轴载作用下单轮影响范围内的1:1室内路基模型试验,分析了长时动荷载作用下砾类土低路堤的动力响应,探究不同含水率状态下砾类低路堤不同深度和不同结构层的应力应变规律。结果表明:(1)地基含水率及荷载不变时,应力随深度增加而快速衰减,通过大量试验数据,统计分析得到了不同状态下地基的应力衰减系数方程。(2)地基含水率越大,地基范围内各层应变累积效应越明显,且在各含水率状态下地基应变累积率均大于路基部分应变累积率。(3)通过对大量数据的统计模拟分析,提出了长时动载作用下低路堤路基和地基范围内动应力累积模型。通过分析长时动荷载作用下砾类土低路堤的动力响应,可为车辆荷载作用下的动力特性提供数据参考,为合理路基高度设计提供依据。
In order to design and build low embankment rationally and improve the service life of low embankment,the law of dynamic response under load should be clear.Based on the 1:1 laboratory subgrade model test within the influence range of standard axial load,this paper analyzes the dynamic response of gravel soil low embankment under long-term dynamic load,and explores the stress-strain changes of different depths and different structural layers of gravel low embankment under different water content.The results show that:(1)When the water content of the foundation and the load remain unchanged,the stress decays rapidly as the depth increases.Through a large amount of test data,statistical analysis has obtained the stress attenuation coefficient equation of the foundation in different states.(2)The greater the water content of the foundation,the more obvious the strain accumulation effect of each layer in the range of the foundation,and the strain accumulation rate of the foundation under each moisture content state is greater than the strain accumulation rate of the subgrade part.(3)Through statistical simulation analysis of a large amount of data,a dynamic stress accumulation model of low embankment subgrade and ground under long-term dynamic load is proposed.By analyzing the dynamic response of gravel-like soil low embankment under long-term dynamic load,it can provide a data reference for the dynamic characteristics under vehicle load and provide a basis for the design of reasonable roadbed height.
作者
韩冬卿
HAN Dongqing(Zhong Dian Jian Ji Jiao Highway Investment Development Co.Ltd.,Shijiazhuang 050051,China)
出处
《自然灾害学报》
CSCD
北大核心
2022年第2期215-221,共7页
Journal of Natural Disasters
基金
河北省交通运输厅科技项目(TH-201925)。
关键词
低路堤
动力响应
模型试验
应力
应变
low embankment
dynamic characteristics
model test
stress
strain
作者简介
韩冬卿(1970-),男,高级工程师,主要从事道路与桥梁工程方面的研究.E-mail:caiyongli3333@126.com
