机车动荷载作用下多年冻土区铁路路基动力响应的试验研究

Test study on dynamic responses of railroad embankments in permafrost regions under train dynamic loading

青藏铁路穿越多年冻土区因地温和含冰量的不同而采取了不同的路基结构形式,以减小或避免气温和工程扰动对其下部多年冻土的影响。为了把握多年列车振动荷载作用下多年冻土区不同结构路基的动力响应特征,对青藏铁路北麓河段典型结构路基进行了实时强震动测试,得到了多年冻土区铁路路基的振动加速度衰减规律,对于研究机车动荷载对青藏铁路多年冻土区路基变形的定量影响规律,保障青藏铁路安全运营具有重要的科学意义。

In order to decrease or avoid the influences of air temperature and engineering disturbance on the permafrost underground,different embankments are used along the Qinghai-Tibet Railroad,according to different earth temperatures and ice contents at permafrost regions.A series of real time vibrating tests are carried out to study the dynamic response characteristics of different structure embankments under train vibration loading at the Beilu River segment of the Qinghai-Tibet Railroad.The train vibration attenuation rule of the railroad embankment in permafrost regions has been formulated.It is significant for research on the quantitative effects of train dynamic loading on embankment deformation in permafrost regions and for safe operation of the Qinghai-Tibet Railroad.