Journal Published Online: 20 December 2022
Volume 46, Issue 2

Wireless Mid-height Pore Water Pressure Sensor



The triaxial apparatus is one of the most widespread testing devices used by geotechnical laboratories for identifying parameters characterizing soil strength and stiffness behavior. In order to do so, the triaxial apparatus has the ability to measure a number of key parameters, among which the measurement of axial force, axial strain, and pore water pressure in the soil play a key role. By default, the measurement of the latter parameter is carried out at the bottom of the sample or, in its more advanced form, at the mid-height of the sample. The second approach, however, introduces the requirement to break the continuity of the membrane surrounding the soil specimen, which can lead to water penetration from the cell into the sample. Nevertheless, this inconvenience can be avoided by using a novel sensor that measures water pressure in the soil pores wirelessly. In addition, as the membrane does not need to be perforated, sample preparation time can be reduced. This article presents the integration of the novel sensor into a triaxial apparatus and its validation in the form of a series of tests performed on several soil types to demonstrate the effectiveness and performance of the wireless water pressure sensor.

Author Information

Witowski, Marcin
Building Research Institute, The Building Structures Geotechnics and Concrete Department, Warsaw, Poland
Pages: 14
Price: $25.00
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Stock #: GTJ20210193
ISSN: 0149-6115
DOI: 10.1520/GTJ20210193