摘要
为了研究改良软土路基动力响应规律,建立了考虑轨道不平顺的列车-无砟轨道-层状路基地基耦合动力学模型,采用傅里叶变换、动力刚度矩阵法对模型进行求解和验证。利用该模型研究了车速、轨道不平顺参数、改良层厚度及模量对路基动力响应的影响,并分析了不同条件下路基中竖向应力沿深度衰减规律。研究结果表明,改良层能够有效减弱软土地基顶面的竖向动应力,车速越大,其作用效果越明显。合理设置改良层的厚度和模量是控制软土路基动力响应的有效手段。
In order to study the dynamic response rules of subgrade on improved soft ground soil,a train-nonballasted track-layered soil coupling dynamic model was established,and Fourier transform and the dynamic stiffness matrix method were applied to solve the model.Then the influence of train speed,rail irregularity,thickness and modulus of improved soil on dynamic response of subgrade was studied using the proposed model.Attenuation law of vertical dynamic stress in subgrade was analyzed for different conditions.The results show that the improved soil effectively reduces vertical dynamic stress on surface of soft soil.With increasing train speed,the stress reduction is more obvious.It is an effective approach of controlling dynamic response of subgrade on soft soil to properly design thickness and modulus of the improved soil.
作者
胡智
艾聘博
裴尧尧
李丽华
HU Zhi;AI Pinbo;PEI Yaoyao;LI Lihua(School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, China;Zhejiang Scientific Research Institute of Transport, Hangzhou 310023, China)
出处
《中国科技论文》
CAS
北大核心
2022年第2期174-181,共8页
China Sciencepaper
基金
国家自然科学基金资助项目(51708190)。
关键词
列车荷载
动力响应
傅里叶变换
分层路基
改良软土路基
train load
dynamic response
Fourier transform
layered subgrade
improved soft ground soil
