洪水顺流作用下行驶车辆稳定性的模型试验研究  

A model test study of the stability of vehicles running along the flood current

作　　者：高帅领 夏军强[1] 周美蓉[1] 董柏良 GAO Shuailing;XIA Junqiang;ZHOU Meirong;DONG Boliang(State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《武汉大学学报（工学版）》2020年第2期95-100,共6页Engineering Journal of Wuhan University

基　　金：国家自然科学基金资助项目(编号:51725902,41890823);武汉大学“重点领域交叉学科创新团队”培育项目(编号:2042017kf0238);英国皇家工程院资助项目(UUFRIP\100031)。

摘　　要：对洪水中部分淹没状态下的行驶车辆进行受力分析,基于河流动力学中泥沙起动原理,推导出行驶车辆失稳时的临界车速公式;采用模型试验测得在不同水流条件下的临界车速,并率定公式中相关参数;利用模型相似关系及公式分别估算汽车在不同水流条件下的临界车速;最后用公式模拟出行驶车辆失稳临界曲线。研究结果表明:达到同一临界车速状况下,水深较小时流速较大;同一流速下,临界车速随水深的增大而增大;同一水深下,临界车速随流速的增大而增大;临界车速与流速的比值随水深增大而增大。The force analysis of a moving vehicle under the condition of partial submergence in a flood is carried out.Based on the theory of threshold of sediment motion in river dynamics,the formula of critical vehicle speed is deduced when the moving vehicle becomes unstable.The critical vehicle speeds under different flow conditions are measured by experiment,and the relevant parameters in the formula are calibrated by the experimental data.Model similarity relation and formula are used to estimate the critical vehicle speed under different flow conditions.Finally,the formula is used to simulate the critical curve of vehicle instability.Results indicate as follows:when the critical vehicle speed is reached,the flow velocity is larger when the water depth is smaller;at the same flow velocity,the critical vehicle speed increases with the increase of water depth;at the same water depth,the critical vehicle speed increases with the increase of flow velocity;the ratio of the critical vehicle speed to the flow velocity increases as the water depth increases.

关 键 词：洪水 行驶车辆 车辆稳定性 临界车速 理论分析 模型试验 

分 类 号：X43[环境科学与工程—灾害防治]