Ultrasonic measurement in variation of a degree of saturation in compacted bentonite
Ultrasonic measurement in variation of a degree of saturation in compacted bentonite
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超声波测量压实膨润土饱和度变化
DOI：
10.1016/j.egypro.2017.09.417
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
H. Kikura
中科院分区：
文献类型：
--
作者：
S. Kimura;K. Kitayama;K. Kimoto;K. Kawamura;H. Kikura
膨润土是一种粘土，被认为是高放废物地质资源库的缓冲材料。膨润土具有高吸附能力、低透水性能和良好的膨胀性，可以对放射性废物进行长期隔离。在长期安全处置管理的背景下，了解膨润土缓冲液中地下水的行为是关系到评价其长期性能的重要问题之一。为了了解压实膨润土中的水行为，重点进行了超声波测试。然而，超声波在压实膨润土中的传播还没有得到很好的了解。为此，本研究利用激光多普勒测振仪研制了高空间测量系统，对压实膨润土样品中的超声波传播进行了观测。对超声波在压实膨润土表面的传播进行了测量。结果，在两种不同饱和度之间的边界上观察到了超声波反射。从而证实了所开发的用于研究压实膨润土中波传播的系统的能力。
Bentonite, which is a kind of clay, is considered as a candidate for a buffer material in a geological repository of the high-level radioactive waste. Bentonite could provide long-term isolation of the radioactive waste because of its high adsorption capacity, low water permeability and good swelling property. In the context of long-term safety of disposal management, understanding groundwater behavior in bentonite buffer is one of the important issues, related to evaluating its long-term performance. In order to understand water behavior in compacted bentonite, the ultrasonic measurement was focused on. However, Ultrasonic wave propagation in compacted bentonite has not been understood well. Therefore, in this study, high spatial measurement system with Laser Doppler Vibrometer was developed in order to observe the ultrasonic wave propagation in compacted bentonite specimen. Ultrasonic wave propagation in compacted bentonite surface was measured. As a result, ultrasonic wave reflection was observed on the boundary between two different degrees of saturation. Thus, the capability of the developed system for investigation of the wave propagation in compacted bentonite is confirmed.