移动荷载作用下土体动力响应的参数影响分析Ⅱ列车-轨道-地基系统

摘要

Based on the moving coordinate and the Navier's integral transform solutions, simulating the transit load by double freedom degree system, dynamic equations of train—track—ground system are solved, and the analytical solutions are derived exactly.A comparative and verifiable analysis indicates that the solutions are accurate.The effects of velocity and frequency of the moving load and elastic modulus of soils on dynamic response of system are investigated and compared with viscous-elasticity half-space, which is of significance to the engineering.%采用移动坐标系,用双自由度体系模拟作用于轨道体系的车体荷载,结合粘弹性半空间积分变换解,求出列车--轨道--地基系统动力响应基本解.算例验证表明本文分析方法的正确性,数值分析了荷载移动速度、频率和土体弹性模量对系统动力响应的影响,并与荷载直接作用在地基上时地基土响应作比较,给出对工程实践有意义的结论.