Application of 3D Consistent Viscous-spring Artificial Boundary Elements in the Simulation of Subgrade Vibration Induced By High-speed Train
Subgrade deformation caused by high-speed train has been limited more and more strictly, therefore the analysis of subgrade dynamic response is of great importance. Based on the theory of 3D consistent viscous-spring artificial boundaries(VSAB) and viscous-spring boundary elements, a multi-sources VSAB was proposed, which considered the influence of the distance between the load point and the boundary whether takes the approximate constant of the perpendicular distance from the load point to the boundary or takes the accurate variables. The example proved the multi-sources VSAB is more accurate and effective. Then it was introduced in the use of ABAQUS software to model soil vibrations due to high-speed trains on subgrade. The accuracy and validity of artificial boundaries in single and multi inner-source were validated by examples. Finite-element meshes include the rail, sleepers, ballast,subgrade, and foundations, which were simulated by solid elements. A series of continuous moving axle loads were used to simulate a moving high-speed train loads. Along the mesh boundaries of proposed 3D model, the consistent viscous-spring artificial boundary (VSAB) conditions were employed to avoid fictitious wave reflections. The parameters of Qin-Shen line were used to calculate the dynamic stress and vertical displacement, the model is validated by comparing with the field data of Pioneers at the Qin-Shen passenger line. With the help of the proposed artificial boundaries, the subgrade vibration induced by high-speed train on rail and subgrade deformations registered for train speeds exceeding 250 km/h are gained by the numerical simulations. The successful application in general finite program of this 3D multi-sources VSAB elements promote the computing efficiency, which made the 3D numerical simulation become easy and convenient, and can be used simply on private computer. Further work is needed to study on the dynamic stress of ballastless railway by the proposed model.
high-speed railway subgrade dynamic response consistent viscous-spring artificial boundaries consistent viscous-spring artificial boundary elements ABAQUS
DONG Liang ZHAO Cheng-gang Cai De-gou
School of Engineering and Architecture, Beijing Jiaotong University, Beijing 100044 Railway Engineering Research Institute, China Academy of Railway Sciences, Beijing, 100081
国际会议
徐州
英文
119-129
2007-10-22（万方平台首次上网日期，不代表论文的发表时间）