关键词: 全尺试验, 陶粒, 连续型（非连续）屏障, 频率实部?空间分布

Abstract: In this paper, the full-scale test method is used to study the vibration isolation effect of different types of barriers (continuous and discontinuous) filled with different materials (ceramsite and sand). Meanwhile, to expand the experimental research, numerical research is supplemented. Therefore, to obtain the dynamic characteristics of the site as the basis of numerical research, the surface wave spectrum analysis (MASW) test was carried out on the original site before the experimental research. Then, to acquire the transfer function and attenuation decibels of the fixed point of the site by experimental research, the program is compiled to calculate the spatial distribution field of acceleration component through numerical method. After combining the above two methods, it is found that: Influence of vibration isolation material: at low frequency, the difference between them is not very obvious; at the intermediate frequency, the difference between the two begins to appear and the vibration isolation performance of ceramsite is close to that of open trench; at high frequency, the influence of material is difficult to show due to the obvious damping effect of soil. In conclusion, the vibration isolation effect of ceramsite is much better than that of sand, and the overall performance is close to the open trench. Influence of barrier type: when the frequency is 30 Hz, the barrier has little effect, and the spatial distribution of components takes the vibration source as the center, showing a circular distribution; When the frequency is 50 Hz, the annular distribution is broken by the barrier and its shape changes from annular to oval, while the short side points to the direction of the wave front, so that the component of a certain intensity is rejected in the rear area of the barrier; When the frequency is 80 Hz, the soil damping effect is obvious, so that the difference between them is not obvious. In conclusion, the vibration isolation effect of continuous barrier is much better than that of discontinuous barrier. Suggestions on the use of materials and barrier types: if general materials are used, both continuous and discontinuous barriers can be used considering factors such as cost. However, using high damping materials and considering the effect of vibration isolation, the continuous barrier is better.

Key words: full-scale test, ceramsite, continuous(discontinuous) barrier, spatial distribution of frequency real part