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New method for full field measurement of pore water pressures
| Content Provider | Scilit |
|---|---|
| Author | Ottolini, M. Broere, W. Dijkstra, J. |
| Copyright Year | 2018 |
| Description | A cost effective method to measure pore water pressures in mixed granular media is described using 40 miniature MEMS pore pressure transducers. High accuracy in a single point is exchanged for lower accuracy full field measurements adjacent to the strongbox wall. The system is easily de-aired and calibrated due to the fact that the transducers are installed inside the strongbox wall. Additionally, the proof of concept test shows that the transducers are sufficiently accurate for problems with large pressure difference such as consolidation of clay while being subjected to elevated stress levels in the geotechnical centrifuge. This chapter introduces the use of cost effective Micro Electro Mechanical System (MEMS) pressure sensors to acquire full field data of pore water pressures in soil samples adjacent to the wall in a strongbox. The MEMS pore pressure array (PPA) has primarily been developed for the TU Delft geotechnical centrifuge. This small beam centrifuge with a radius of 1.22 m has recently been re-equipped with modern data acquisition and camera facilities. The printed circuit boards (PCBs) are a four-layer design consisting of a back and a front layer for placement of the electrical components and two inner planes serving as ground plane. The data of each sub-PCB is connected through flat cables to a central CRUMBX microcontroller board that houses an Atmel AtxMega128 microcontroller. The strongbox is modified to accommodate simultaneous saturation and calibration of all sensors. The calibration is performed at room temperature which is similar to the temperature in the intended test. Book Name: Physical Modelling in Geotechnics |
| Related Links | https://content.taylorfrancis.com/books/download?dac=C2018-0-86959-9&isbn=9780429438660&doi=10.1201/9780429438660-43&format=pdf |
| Ending Page | 327 |
| Page Count | 5 |
| Starting Page | 323 |
| DOI | 10.1201/9780429438660-43 |
| Language | English |
| Publisher | Informa UK Limited |
| Publisher Date | 2018-07-11 |
| Access Restriction | Open |
| Subject Keyword | Book Name: Physical Modelling in Geotechnics Geological Engineering Cost Effective Mems Pore Pressure |
| Content Type | Text |
| Resource Type | Chapter |
