A Simple Method for Detecting Cracks in Soil-Cement Reinforcement for Centrifuge Modelling
This paper presents the development, implementation and experimental evaluation of a new crack detection mechanism for centrifuge modelling. The proposed mechanism is a brittle conductor bonded to cement providing a binary indication of if, and when, a sensor is cracked. The results of a pair of large centrifuge tests were used to evaluate the effectiveness of the proposed crack detection mechanism. Each test model included a soil profile consisting of a 23 m thick layer of lightly over-consolidated clay, underlain and overlain by thin layers of dense sand. The centrifuge models had two separate zones, a zone without reinforcement and a zone with an 'embedded' soil-cement grid, which had a unit cell area replacement ratio Ar = 24%. Models were subjected to 13 different shaking events with peak base accelerations ranging from 0·01 to 0·55g. The performance of the proposed crack detection mechanism was examined using (i) post-test crack mapping in the soil-cement grids, (ii) results of the crack detection system and (iii) time series of accelerations, displacements and footing rotation. The results from the centrifuge test showed that the proposed crack detection method accurately captured if, and when, cracking occurred in the soil-cement grid at the locations of the sensors.
S. Tamura et al., "A Simple Method for Detecting Cracks in Soil-Cement Reinforcement for Centrifuge Modelling," International Journal of Physical Modelling in Geotechnics, vol. 18, no. 6, pp. 281-289, ICE Publishing, Nov 2018.
The definitive version is available at https://doi.org/10.1680/jphmg.17.00036
Civil, Architectural and Environmental Engineering
Keywords and Phrases
Centrifuges; Reinforcement; Soil cement; Soils
International Standard Serial Number (ISSN)
Article - Journal
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01 Nov 2018