淤泥固化土路基动力响应研究

Study on Dynamic Response of Silt-solidified Soil Subgrade

摘要:

为了研究交通荷载对淤泥固化土路基动力性能的演化规律，现场淤泥固化土路基试验依托于上海市乐高乐园附属道路建设项目，对淤泥固化土路基进行不同的工程测试。测试路基在车辆不同速度、不同轴重下土压力和应变的时程变化；研究土压力峰值、应变峰值在不同速度、不同轴重作用下，沿深度分布的衰减机制。测试结果表明：在一定的速度范围内的交通荷载作用下，土体所受动应力和动应变与车辆轴重或速度呈正相关，轴重对动应力的影响相比速度更加显著。在车辆低速经过测试断面的过程中，不同的轮轴都会有一个对应的应力峰值产生，在增大车速后，相距较近的不同车轴之间产生的动应力会互相影响，并逐步演变成应力叠加现象。

Abstract:

In order to study the evolution law of traffic load on the dynamic performance of silt-stabilized soil subgrade, the on-site silt-solidified soil subgrade test is based on the Shanghai Legoland Auxiliary Road Construction Project, and various engineering tests on the silt-solidified soil subgrade are conducted. The time-history variations of earth pressure and strain of the subgrade under different vehicle speeds and axle loads are tested. The attenuation mechanism of peak earth pressure and peak strain along depth distribution under the action of different speeds and different axle loads are studied. The test results show that under the action of traffic loads within a certain speed range, the dynamic stress and dynamic strain on the soil are positively correlated with the axle load or speed of the vehicle, and the influence of axle load on dynamic stress is more significant than that of speed. During the process of the vehicle passing through the test section at a low speed, a corresponding stress peak will be generated at different axles. After increasing the vehicle speed, the dynamic stresses generated between different axles that are relatively close to each other will influence each other and gradually evolve into a stress superposition phenomenon.