【摘要】 【目标】综合管廊通常埋深较浅且易受上部车辆动荷载的影响，而车辆动荷载的频率作为影响其传播特征的重要因素在以往的研究中较少体现，因此需探究不同频率车辆动荷载作用下黄土路基及浅埋综合管廊的动力响应规律。【方法】设计制作了车辆-黄土路基-综合管廊物理模型体系，通过调整激振器偏心距的方法模拟强度相近而频率由13.5递增至20.0 Hz的车辆动荷载，揭示不同频率车辆动荷载在黄土路基中垂直向传播规律及浅埋综合管廊的动力响应特征。【结果】车辆动荷载强度不变的条件下，黄土路基对低频振动的加速度响应程度更高。车辆荷载的动力影响主要范围在地表至地下60 cm。埋深2 m的浅埋管廊在车辆动荷载的影响范围内，同时管廊周围土体尤其上部土体的加速度响应程度明显高于纯黄土断面。管廊顶板与上部土体的相互作用较为显著，侧壁与土体间的动态接触压力约为顶板部位的63%。【结论】低频车辆动荷载作用下，管廊与土体接触压力的动态响应峰值明显大于高频车辆振动工况，管廊结构的加速度、应变动态响应幅度同样更为显著。更多还原

【Abstract】 [Objective] Utility tunnels are usually shallow-buried,and susceptible to vehicle dynamic loads above. The study on vehicle dynamic load frequency, as an important factor affecting propagation characteristics,is insufficient. Therefore,the study investigated dynamic response mechanisms of loess subgrade and shallow-buried utility tunnels under vehicle loads with different frequencies. [Method] A physical model of vehicle-loess subgrade-utility tunnel system was developed. By altering exciter eccentricity,the dynamic vehicle loads with similar intensity and with frequencies from 13. 5 Hz to 20. 0 Hz were simulated. The vertical propagation pattern of vehicle dynamic loads with various frequencies in loess subgrade was revealed,as well as the dynamic response characteristics of shallow-buried utility tunnels. [Result]The acceleration response of loess subgrade to low-frequency vibration is higher in the condition of constant vehicle dynamic load intensity. The main range of vehicle loads dynamic effects is from the ground to 60 cm below.Shallow-buried utility tunnels with burial depth of 2 m are within the effect of dynamic vehicle loads; whereas the acceleration response of soil surrounding the tunnel,particularly the upper soil,is substantially greater than that of pure loess section. The interaction between tunnel top plate and upper soil is more significant. The dynamic contact pressure between side wall and soil is approximately 63% of that on top plate. [Conclusion]Under low-frequency vehicle dynamic load,the peak dynamic response of contact pressure between utility tunnel and soil is significantly greater than that with high-frequency vehicle vibration,as well as significantly greater are the acceleration and strain dynamic response amplitudes of tunnel structure.更多还原