综合管廊直接埋设于城市道路下方，属于典型的浅埋地下结构。管廊结构所承受的活荷载主要是道路上方的车辆振动荷载。浅埋地下结构无法形成自然拱抵消车辆荷载振动的影响，相比地铁等深埋地下结构，车辆荷载振动对管廊结构的动力响应特性和失效破坏作用更为显著。因此，开展车辆振动荷载下浅埋管廊结构动力响应特性的研究尤为重要。本文以西安某地下综合管廊工程为背景，运用理论计算和模型试验相结合的方法，得到了浅埋管廊结构受车辆振动影响的动力响应特性，并提出了针对浅埋管廊结构受车辆振动影响的隔振措施。主要研究成果如下：

（1）分析了车辆振动荷载产生原因和传播特性，发现路面不平顺、车辆自重和车速是振动产生的主要原因。基于对地下结构受车辆荷载的计算理论，结合浅埋管廊结构不能形成自然拱的特点，得到了车辆振动荷载下浅埋管廊结构受力特性和变形机理。

（2）确定了车辆振动荷载计算模型为简谐波动荷载。在分布角法的基础上，结合了浅埋管廊结构受力特性和变形机理，建立了车辆-浅埋管廊结构力学计算模型。应用达朗贝尔原理，构建了车辆振动荷载下浅埋管廊结构动力响应的平衡微分方程。使用Wilson-θ积分法进行求解，得出了车辆振动荷载下浅埋管廊结构位移、速度和加速度动力响应计算表达式，可为浅埋管廊结构设计提供理论参考。

（3）基于相似理论确定了浅埋管廊材料、尺寸和作用荷载大小，并配制了地层相似模拟材料。结合力学计算模型，施加不同幅值、不同频率的简谐波动荷载，开展了车辆振动荷载下浅埋管廊结构动力响应模型试验研究。得到了车辆振动荷载下浅埋管廊结构响应特性，管廊顶板压力明显大于底板，且最大值均在结构中线处，呈现中间高两端低的受力特点。与振动幅值相比，荷载频率对结构的动力响应更剧烈。明确了车辆振动荷载下浅埋管廊结构在埋深6 m时主要影响范围为0.45m~1.05m，即在水平方向6倍管径范围内。

（4）将车辆振动荷载下浅埋管廊结构理论计算方法与模型试验得出的动力响应规律进行对比，验证了理论计算方法的合理性。并针对振源、传播路径和受振体三个方面提出了局部加强结构、设变形缝和混凝土连续墙等隔振措施。为车辆振动荷载下浅埋管廊结构的稳定性分析和安全性评价提供参考。

The integrated pipe gallery is directly buried under the urban road, which is a typical shallow buried underground structure. The live load borne by the pipe gallery structure is mainly the vehicle vibration load above the road. Shallowly buried underground structures cannot form natural arches to offset the impact of vehicle load vibration. Compared with deeply buried underground structures such as subways, vehicle load vibrations have more significant effects on the dynamic response characteristics and failure damage of pipe gallery structures. Therefore, it is particularly important to study the dynamic response characteristics of shallow buried pipe gallery structures under vehicle vibration loads. Based on the background of an underground comprehensive pipe gallery project in Xi'an, this paper uses the method of combining theoretical calculation and model test to obtain the dynamic characteristics of the shallow buried pipe gallery structure affected by vehicle vibration, and proposes a method for the shallow buried pipe gallery structure affected by vehicle vibration. Vibration isolation measures for vibration effects. The main research results are as follows:

(1) The causes and propagation characteristics of vehicle vibration load is analyzed, and it is found that road surface roughness, vehicle weight and vehicle speed are the main causes of vibration. Based on the calculation theory of the vehicle load on the underground structure, combined with the fact that the shallow buried pipe gallery structure cannot form a natural arch, the mechanical characteristics and deformation mechanism of the shallow buried pipe gallery structure under the vehicle vibration load are obtained.

(2) The calculation model of vehicle vibration load is determined as simple harmonic dynamic load. On the basis of the distribution angle method, combined with the mechanical characteristics and deformation mechanism of the shallow buried pipe gallery structure, a vehicle-shallow buried pipe gallery structure mechanics calculation model is established. By applying D'Alembert principle, the equilibrium differential equation of the dynamic response of the shallow buried pipe gallery structure under the vehicle vibration load is constructed. The Wilson-θ integral method is used to solve the problem, and the dynamic response calculation expressions of the displacement, velocity and acceleration of the shallow-buried pipe gallery structure under the vehicle vibration load are obtained, which can provide a theoretical reference for the structural design of the shallow-buried pipe gallery.

(3) Based on the similarity theory, the material, size and action load of the shallow buried pipe gallery were determined, and the stratum simulation material was prepared. Combined with the mechanical calculation model, simple harmonic dynamic loads of different amplitudes and frequencies are applied, and the model test of the dynamic response of the shallow buried pipe gallery structure under the vehicle vibration load is carried out. The structural response characteristics of the shallow buried pipe gallery under the vehicle vibration load are obtained. The pressure of the top plate is obviously greater than that of the bottom plate, and the maximum value is at the center line of the structure, showing the characteristics of stress in the middle and low at both ends. The dynamic response of the structure to the load frequency is more severe than the vibration amplitude. It is clarified that the main influence range of the shallow buried pipe gallery structure under the vehicle vibration load is 0.45 m to 1.05 m when the buried depth is 6 m, that is, within the range of 6 times the pipe diameter in the horizontal direction.

(4) The theoretical calculation method of the shallow buried pipe gallery structure under the vehicle vibration load is compared and verified with the dynamic response law obtained from the model test, and the rationality of the theoretical calculation method is verified. In view of the vibration source, the propagation path and the vibration body, some vibration isolation measures, such as local strengthening structure, deformation joints and concrete diaphragm walls, are proposed. It provides a reference for the stability analysis and safety evaluation of the shallow buried pipe gallery structure under the vehicle vibration load.

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