Considering the relevance of clay mineral-bearing geomaterials in landslide/mass movement hazard assessment, various engineering projects for resource development, and stability evaluation of underground space utilization, it is important to understand the permeability of these clay mineral-based geomaterials. However, only a few quantitative data have been reported to date regarding the effects of the clay mineral type and hydraulic gradient on the permeability of clay mineral materials. This study was conducted to investigate the permeability of clay mineral materials based on the clay mineral type, under different hydraulic gradient conditions, through a constant-pressure permeability test. Comparative tests have revealed that the difference in the types of clay mineral influences the swelling pressure and hydraulic conductivity. In addition, it has been found that the difference in water pressure (hydraulic gradient) affects the hydraulic conductivity of clay mineral materials. The hydraulic conductivity has been found to be closely associated with the specific surface area of the clay mineral material. Furthermore, the hydraulic conductivity value measured is almost consistent with the value calculated theoretically using the Kozeny–Carman equation. Moreover, the hydraulic conductivity is also found to be closely associated with the hydrogen energy, calculated from the consistency index of clay. This result suggests that the hydraulic conductivity of clay mineral materials can be estimated based on the specific surface area and void ratio, or consistency index of clay.

中文翻译：

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水力梯度和黏土类型对黏土矿物材料渗透性的影响

考虑到粘土矿物土工材料在滑坡/质量运动危害评估中的相关性，各种资源开发工程项目以及地下空间利用的稳定性评估，重要的是了解这些粘土矿物基土工材料的渗透性。然而，迄今为止，关于粘土矿物类型和水力梯度对粘土矿物材料渗透性的影响，迄今仅报道了一些定量数据。通过恒压渗透试验，研究了在不同水力梯度条件下基于粘土矿物类型的粘土矿物材料的渗透性。比较测试表明，粘土矿物类型的差异会影响溶胀压力和水力传导率。此外，已经发现水压的差异（水力梯度）影响粘土矿物材料的水力传导率。已经发现水力传导率与粘土矿物材料的比表面积紧密相关。此外，测得的水力传导率值与理论上使用Kozeny-Carman方程计算的值几乎一致。此外，从粘土的稠度指数计算，还发现水力传导率与氢能密切相关。该结果表明，可以基于比表面积和空隙率或粘土的稠度指数来估计粘土矿物材料的水力传导率。