摘要
列车脱轨会对隧道结构产生重大损害,为此提出一种在保证计算精度的前提下能大幅度提高计算效率的列车撞击盾构隧道混合多尺度动力分析模型,以降低列车脱轨事故的潜在风险。首先,建立考虑管片接头效应的常规非多尺度模型及2种单一多尺度模型(同类型单元粗细网格耦合多尺度模型和不同类型单元壳-体耦合多尺度模型),通过3种模型的管片静力学试验结果对比分析,验证2种单一多尺度模型的适用性;然后,将2种单一多尺度模型结合成混合多尺度模型,应用于列车撞击盾构隧道动力分析中,并与采用常规非多尺度模型的计算结果进行对比。结果表明:在静力荷载下,2种单一多尺度模型在位移、应力及损伤面积的分布规律上与常规非多尺度模型一致,计算值误差均在3.5%以内,且计算时间缩短了50%左右;在撞击荷载下,混合多尺度模型与常规非多尺度模型计算所得的管片位移和拉压损伤发展规律一致,但混合多尺度模型计算数值偏大,除拉伸损伤面积误差为8.56%外,其余结果误差均在5%以内;混合多尺度模型在保证计算精度的前提下,将计算时间缩减了62.4%,为类似问题提供了更为高效的解决方案。
Train derailment will cause serious damage to the tunnel structure.Therefore,a hybrid multiscale dynamic analysis model of train impacting shield tunnel is proposed,which can greatly improve the calculation efficiency under the premise of ensuring the calculation accuracy,so as to reduce the potential risk of rail derailment.Firstly,the conventional nonmultiscale model and two single multiscale models(the same type of unit coarsefine mesh coupling multiscale model and different types of unit shellbody coupling multiscale model)are set up considering the effect of segment joint.The applicability of the two single multiscale models is verified by comparing and analyzing the segment static test results of the three models.Then,the two single multiscale models are combined into a hybrid multiscale model,which is applied to the dynamic analysis of train impacting shield tunnel and compared with the calculation results of the conventional nonmultiscale model.The results show that under static load,the two single multiscale models are consistent with the conventional nonmultiscale model in terms of the distribution law of displacement,stress and damage area.The errors of calculated values are within 3.5%,and the calculation time is shortened by about 50%.Under the impact load,the segment displacement and tension and compression damage development law calculated by the hybrid multiscale model and the conventional nonmultiscale model are consistent.But the calculated values of the hybrid multiscale model are too large,and the errors of the remaining results are all within 5%,except for the tensile damage area error of 8.56%.The hybrid multiscale model reduces the calculation time by 62.4%under the premise of ensuring the calculation accuracy,which provides more efficient solutions for similar problems.
作者
王二力
晏启祥
孙明辉
张天
邓志鑫
WANG Erli;YAN Qixiang;SUN Minghui;ZHANG Tian;DENG Zhixin(Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu Sichuan 610031,China;Sichuan Airport Group Co.,Ltd.,Chengdu Sichuan 610042,China)
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2022年第2期75-85,共11页
China Railway Science
基金
国家自然科学基金资助项目(51878573)。
关键词
混合多尺度模型
列车撞击
盾构隧道
计算时效
结构损伤
Hybrid multiscale model
Train impact
Shield tunnel
Calculation aging
Structural damage
