岩土力学2009，Vol.30Issue(7)：1944-1950,7.
提速列车荷载作用下铁路路基动力特性的研究
Dynamic responses of existing-railway subgrade with train speed increasing
摘要
Abstract
Considering the increase of speed-trains in existing railways of China, i.e., passenger train will run at speed of 200 km/h and heavy truck at speed of 120 km/h, thus the dynamic responses of railway subgrade with train speed increasing are studied. Firstly, the coupled dynamic model of train-track-subgrade is applied to calculate the interaction force between wheel and track. Subsequently, according to nonlinear numerical analysis, the dynamic responses of subgrade are analyzed with different train groupages and running speeds, including the dynamic subgrade stress, displacement and acceleration, and their distribution and attenuation in subgrade. Moreover, relationships between the design parameters of subgrade and its dynamic responses are also studied. Field measured data were used to verify the numerical results. It is found that the influence of train speed on subgrade dynamic responses is limited, whereas the axial load of train affects subgrade greatly; there is an optimum stiffness for strengthened subgrade(i.e. 120 MPa). With the thickness of ballast increasing, the subgrade dynamic stress reduces linearly, but dynamic displacement and acceleration have a negligible change.关键词
既有线/提速/路基/动力响应Key words
existing railway/ speed-up/ subgrade/ dynamic response分类
交通工程引用本文复制引用
陈建国,肖军华,李前进,曹艳梅..提速列车荷载作用下铁路路基动力特性的研究[J].岩土力学,2009,30(7):1944-1950,7.基金项目
国家自然科学基金重点项目(No. 50538010) （No. 50538010）
北京交通大学科技基金(No. 2007XM027)资助. （No. 2007XM027）
