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大型物理实验装置为获得高品质的强流脉冲电子束流,通常对地基振动都有较高的要求。详尽的地质振动状况分析是装置选址的重要前提。本文针对某装置待勘区域实际地质条件和周围人文环境,首先简要介绍了测点布设、振动测试系统的基本组成,然后通过分阶段测试比对试验对某装置待勘区域进行实际振动测量,最后应用谱分析的方法对区域内不同时间段、不同方向的测量数据进行分析,评估选址位置是否合理。数据结果表明,待勘区域在5μm·s~(-1)以上速度被95%概率检测,垂直方向位移振幅谱在185 nm,水平方向大于垂直方向约60 nm,物理实验表明,进一步基建过程中应采取适当的减震措施降低垂直位移幅度。
In order to obtain high quality pulsed electron beam with high intensity, the large-scale physics experiment device usually has higher requirements for ground vibration. Detailed geological vibration analysis is an important prerequisite for site selection. In this paper, aiming at the actual geological conditions and the surrounding human environment in a certain area of a device to be surveyed, the basic composition of a system for measuring and distributing points and vibrations is briefly introduced. Then the actual vibration measurement of a device to be surveyed is carried out through the phase comparison test. Finally, The method of spectral analysis is used to analyze the measurement data in different periods and directions in the area to evaluate whether the location of the site is reasonable. The results show that the velocity of the region to be surveyed is above 95%, the vertical displacement amplitude is 185 nm and the horizontal direction is about 60 nm. The physical experiments show that in the process of further construction Appropriate damping measures should be taken to reduce the vertical displacement.