Study of Desiccation Cracks in Soils Using A 2D Laser Scanner

Sánchez, Marcelo; Atique, Alvis; Kim, Sewon; Romero, E.; Zieliński, Marcin

doi:10.1061/9780784412787.081

Cited by 2 publications

(3 citation statements)

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“…The kaolin clay has a liquid limit of 57.9 % and plastic limit of 29.7 % (Wang and Siu 2006). A uniform and saturated soil specimen was prepared close to its liquid limit (Sanchez et al 2013a(Sanchez et al ,2013b by applying one-dimensional consolidation to the clay slurry, following the procedure described in Wang and Siu (2006). Entrapment of air bubbles was minimized during the specimen preparation.…”

Section: Materials and Specimen Preparationmentioning

confidence: 99%

“…These image processing techniques have revealed a number of limitations in determining volume change in drying soils. The technique does not provide precise and accurate results when taking pictures from only one direction (Sanchez et al 2013a(Sanchez et al , 2013b. The research literature reveals that there is still need for an accurate, non-destructive, and inexpensive measurement technique for the determination of the volume of a soil specimen subjected to the drying process.…”

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confidence: 99%

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Non-Contact Sensing System to Measure Specimen Volume During Shrinkage Test

2015

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The shrinkage curve provides information of value for the interpretation of soil-water characteristic curve data. However, there is need for an accurate and precise volume measurement technique during the shrinkage test. This paper presented an inexpensive automated digital image processing technique, which allowed accurate and precise measurements of the soil specimen volume. The volume was computed by accurately measuring the radius and height over the entire lateral surface of specimen. The proposed volume measurement technique involved projecting a structured light laser on the soil specimen in order to provide the reference points for measurements. A 360 view of the specimen was then captured using a camera. High resolution images were then processed using functions developed within MATLAB. The computations also allowed the reconstruction of a 3D mesh model of the specimen. A validation test on a dummy object showed that the error in radius and height measurements at more than 75 % measurement points was less than 60.05 and 60.07 mm, respectively. A 99 % accuracy was achieved in the volume measurement of the soil specimen.

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Section: Materials and Specimen Preparationmentioning

confidence: 99%

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confidence: 99%

Non-Contact Sensing System to Measure Specimen Volume During Shrinkage Test

2015

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“…However, cracking dynamics of clay soils are difficult to monitor. Surface cracking patterns can be described using visual imaging analysis [1], laser scanning method [2], and direct measurements of cracking dimensions [3]. Destructive methods such as soil pits [4] are frequently implemented for in situ measurements.…”

Section: Introductionmentioning

confidence: 99%

Detection of Cracks in Clay Soil Using Quasi-3D Electrical Resistivity Tomography Method: Numerical and Experimental Study

Hassan

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Soil cracks affect the geotechnical characteristics of clay soils frequently used in engineered earth structures. In this work, numerical simulation and laboratory tests using Wenner- Schlumberger array of Electrical Resistivity Tomography (ERT) method are adopted to detect soil cracks in compacted clay soil. 3D numerical simulation showed that air-filled cracks have an anomalous high resistivity signature that can be differentiated from the background due to the high resistivity contrast between cracks and the surrounding soil. Depth, geometry, and extension of the simulated cracks are reasonably indicated. At the laboratory scale, quasi-3D ERT experiment was conducted. The results showed that soil resistivity is significantly affected by an artificially introduced crack as the crack forms a barrier that disturbs the flow of electricity in the soil. Similarly, depth, geometry, and extension of the crack are detected. Both numerical and experimental findings demonstrated that ERT method can effectively be used to identify cracking in clay soils. It is suggested that ERT, as a non invasive method, can be adopted with other traditional geotechnical methods for detecting cracks in clay soils.

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Study of Desiccation Cracks in Soils Using A 2D Laser Scanner

Cited by 2 publications

References 4 publications

Non-Contact Sensing System to Measure Specimen Volume During Shrinkage Test

Non-Contact Sensing System to Measure Specimen Volume During Shrinkage Test

Detection of Cracks in Clay Soil Using Quasi-3D Electrical Resistivity Tomography Method: Numerical and Experimental Study

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