Experimental investigation on the transmissivity of fractured granite filled with different materials
Experimental investigation on the transmissivity of fractured granite filled with different materials
复制标题
不同材料充填裂隙花岗岩透射率实验研究
DOI：
10.1007/s10064-021-02521-x
复制
发表时间：
2022
影响因子：
4.2
通讯作者：
Shengqi Yang
中科院分区：
文献类型：
--
作者：
Qun Sui;Diansen Yang;Weizhong Chen;Shengqi Yang
高放射性废物（HLW）的处置是全球最具挑战性的问题之一，而花岗岩被认为是理想的母岩。在本文中，我们对填充不同材料的裂隙花岗岩的透射率进行了实验研究。通过一系列试验来研究不同因素（填充材料、围压和裂缝粗糙度）对裂缝透射率的影响。我们的结果表明，填充材料的性能对裂隙花岗岩的透射率起着至关重要的作用。具体而言，石英砂显着提高了裂隙花岗岩的透射率，但砂粒尺寸越大，透射率增加越慢。相反，与没有任何填充材料的断裂样品相比，膨润土作为填充材料降低了断裂透射率。此外，围限应力对透射率也有很大的影响，高应力会压缩填充材料，导致透射率降低。此外，围压对充砂裂缝样品透射率的影响比其他样品更大。我们量化裂缝的粗糙度以检查其对透射率的影响。结果表明，对于未充填的裂缝，较大的粗糙度会降低透射率，但对于砂质充填的裂缝则有相反的影响，而对于膨润土充填的裂缝结果则比较分散。本研究可为评估高放废物储存库的安全性提供重要指导。
The disposal of high-level radioactive waste (HLW) is one of the most challenging issues globally, and granite is considered an ideal host rock. In this paper, we present an experimental study on the transmissivity of fractured granite filled with different materials. A series of tests were carried out to study the effects of different factors (filling material, confining stress, and fracture roughness) on fracture transmissivity. Our results show that the properties of the filling material play a critical role in the transmissivity of fractured granite. Specifically, quartz sand significantly increases the transmissivity of the fractured granite, but the larger the sand particle size, the slower the transmissivity increases. Conversely, compared with fractured samples without any filling material, bentonite as a filling material decreases fracture transmissivity. Furthermore, confining stress also exhibits a great effect on transmissivity, and high stress compresses the filling material, resulting in a reduction in transmissivity. In addition, confining stress has a larger impact on the transmissivity of sand-filled fractured samples than others. We quantify the roughness of the fractures to examine its impact on the transmissivity. The results show that larger roughness reduces transmissivity for the unfilled fractures, but has an opposite effect on sand-filled fractures, while the results of bentonite-filled fractures are scattered. This study could provide an important guidance for evaluating the safety of HLW repositories.