Development and engineering application of a new type of Nan-55 permeameter

HOU Longqing; YUAN Xiaoming; CHEN Longwei; LI Mingdong

doi:10.11779/CJGE20210971

Volume 45 Issue 2

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Chinese Journal of Geotechnical Engineering > 2023 > 45(2): 419-425. > DOI: 10.11779/CJGE20210971

HOU Longqing, YUAN Xiaoming, CHEN Longwei, LI Mingdong. Development and engineering application of a new type of Nan-55 permeameter[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(2): 419-425. DOI: 10.11779/CJGE20210971

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Development and engineering application of a new type of Nan-55 permeameter

1.
School of Civil and Architectural Engineering, East China University of Technology, Nanchang 330013, China
2.
Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Heilongjiang 150080, China
3.
Key Laboratory of Earthquake Disaster Mitigation, Ministry of Emergency Management, Heilongjiang 150080, China

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Received Date: August 21, 2021
Available Online: February 23, 2023

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Abstract

Abstract

The Nan-55 permeameter is widely adopted to determine the coefficient of permeability for fine-grained soils because of its simple structure and easy operation. However, for the permeability tests on undisturbed soil samples, the poor contact between the soil samples and the ring cutter may result in leakage of sidewalls and wrong test results. A new type of Nan-55 permeameter with split ring-cutter structure is developed in order to solve the leakage problem of sidewalls. The side leakage channel between the samples and the ring cutter is blocked by the paste such as Vaseline. What is more, the new-type Nan-55 permeameter has advantages of simple structure and easy operation by adopting the basic structure of the Nan-55 permeameter. At the same time, the reliability of the permeability test results is analyzed, and it is shown that the new-type Nan-55 permeameter effectively overcomes the leakage problem of sidewalls. The coefficient of permeability for the undisturbed fine-grained soils measured by the new-type Nan-55 permeameter has a high accuracy and stability, which are much higher than those measured by the Nan-55 permeameter. The new type Nan-55 permeameter has the prospect to be popularized in the laboratory.
- permeameter,
- sidewall leakage,
- coefficient of permeability,
- undisturbed fine-grained soil

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