Application of Transient Pulse Method to Permeability Measurement for Clay
Application of Transient Pulse Method to Permeability Measurement for Clay
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DOI：
10.2472/jsms.67.318
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Masaji Kato;Y. Nara;Y. Okazaki;Masanori Kohno;Toshinori Sato;Tsutomu Sato;Manabu Takahashi
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文献类型：
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作者：
Masaji Kato;Y. Nara;Y. Okazaki;Masanori Kohno;Toshinori Sato;Tsutomu Sato;Manabu Takahashi
为了保证放射性废物的安全地质处置，必须确定粘土的渗透性。瞬态脉冲法测定材料的渗透率所需时间较短，适用于低渗透材料。在瞬态脉冲试验中，通常会增加上游孔压。但是，由于孔隙压力的增加，在此过程中不可能确定粘土的渗透性。因此，瞬态脉冲试验从未被用于确定粘土的渗透性。在这项研究中，我们试图将瞬态脉冲试验应用于米祖伊地下研究实验室获得的粘土，以确定渗透率随下游孔隙压力的降低。通过对花岗岩的测试，阐明了下游孔压递减的瞬态脉冲试验是合适的。试验结果表明，随着下游孔压的降低，瞬态脉冲试验确定的粘土渗透率与降水头试验确定的渗透率基本一致。瞬态脉冲试验的测量时间比降水头试验短得多。试验结果表明，瞬态脉冲试验是测定粘土渗透性的一种有效方法。
To ensure the safe geological disposal of radioactive wastes, it is important to determine the permeability of clays. The transient pulse test is suitable to apply to the low permeability materials, because it takes relatively short term to determine the permeability. Usually we increase the upstream pore pressure in the measurement with the transient pulse test. However, it is impossible to determine the permeability of clay in this procedure because of the increase of pore pressure. Therefore, the transient pulse test has never been applied to the determination of permeability of clays. In this study, we tried to apply the transient pulse test to a clay obtained in Mizunami Underground Research Laboratory to determine the permeability with decreasing the downstream pore pressure. It was clarified that the transient pulse test with decreasing downstream pore pressure is appropriate from the measurement of granite. It was shown that the permeability of a clay was determined by the transient pulse test with decreasing the downstream pore pressure, which agreed with the permeability determined from the falling head test. The measurement time of the transient pulse test is much shorter than that of the falling head test. It is concluded that the transient pulse test is appropriate for the determination of the permeability of clays.