【摘要】 通过遂渝线现场实测,对CRH2动力分散型机车在桩板结构路基试验段高速行车条件下的动响应规律进行了研究,分析路基动力响应和列车速度的关系以及动应力沿路基深度方向的变化规律等。结果表明:随车速的增大,动位移、加速度及动应力均有不同程度的增加,并在临界速度附近先增大后减小;动应力随路基深度的增加衰减很快,并且随着深度的增加,动应力值和静态应力值越来越接近;桩底土动应力较大,桩基加深了路基的动力影响范围,改善了路基土体部分的受力状态。更多还原

【Abstract】 Based on the field test in Suining-Chongqing High-speed Railway, the dynamic responses of pile-plank embankment, on which a disperse impetus locomotive CRH2 with high speed is running, are studied; the relationship between the dynamic responses and the train speed is analyzed; the changes of dynamic stress along the depth of subgrade is analyzed. The analyses indicate that the displacement, acceleration and dynamic stress increase in various degrees while the train speed increases, and they increase first and then decrease at the critical velocity. The dynamic stress attenuates fast with increasing depth of the subgrade, while increasing the depth, dynamic stress is closer to the static stress. Dynamic stress at pile-bottom soil is biggish, and pile structure expands the depth of the dynamic response of roadbed and improves the stress of the roadbed soil.更多还原