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为研究铺设半刚性防水结构层的膨胀土路堑基床的振动特性,在实验室内进行1∶1大比例尺模型试验,对基床在干燥、降雨和地下水位上升3种服役环境下以4 Hz频率分别进行100×104次激振,监测路堑基床不同位置的加速度和速度响应。结果表明:在相同循环动力荷载作用下,服役环境对新型基床结构的振动加速度和速度大小具有显著影响,但对二者沿基床深度方向的衰减规律影响不大;与干燥服役环境相比,路基面的加速度和速度增长幅度在降雨服役环境下分别为35%和20%,地下水位上升时分别为45%和23%。
In order to study the vibration characteristics of expansive soil cutting bed with semi-rigid waterproof structure, a 1: 1 large-scale model test was conducted in the laboratory. The bed was heated at 4 Hz under three service conditions, including drying, rainfall and groundwater level rise. Frequency of 100 × 104 times were excited to monitor the basement bed cutting acceleration and velocity response. The results show that under the same cyclic dynamic load, the service environment has a significant effect on the vibration acceleration and velocity of the new bed structure, but has little effect on the attenuation law along the depth of the bed. Compared with the dry service environment , And the acceleration and speed increase of subgrade surface are 35% and 20% under the rainfall service environment respectively, while the groundwater level rises 45% and 23% respectively.