Borehole Shear Test in Geotechnical Investigations

This case study presents the engineering approach conducted for stabilizing a landslide that occurred at “El Portalet” Pass in the Central Spanish Pyrenees activated due to the construction of a parking lot. Unlike common slope stabilization cases, measures projected here were aimed at slowing and controlling the landslide, and not completely stopping the movement. This decision was taken due to the slow movement of the landslide and the large unstable mass involved. The degree of success of the stabilization measures was assessed by stability analyses and data obtained from different geotechnical investigations and satellite survey techniques such as GB-SAR and DinSAR conducted by different authors in the area under study. The water table was found to be a critical factor in the landslide’s stability, and the tendency of the unstable slope for null movement (total stability) was related to the water table lowering process, which needs more than 10 years to occur due to regional and climatic issues. Results showed a good performance of the stabilization measures to control the landslide, demonstrating the effectiveness of the approach followed, and which became an example of a good response to the classical engineering duality cost–safety.

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Structural and geotechnical investigations on Sivrice earthquake (Mw = 6.8), January 24, 2020

Natural Hazards ◽

10.1007/s11069-020-04468-w ◽

2021 ◽

Author(s):

Rasim Temür ◽

Erdem Damcı ◽

Seda Öncü-Davas ◽

Cihan Öser ◽

Sinan Sarğın ◽

...

Keyword(s):

Geotechnical Investigations

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Modeling of Drag Finishing—Influence of Abrasive Media Shape

Journal of Manufacturing and Materials Processing ◽

10.3390/jmmp5020041 ◽

2021 ◽

Vol 5 (2) ◽

pp. 41

Author(s):

Irati Malkorra ◽

Hanène Souli ◽

Ferdinando Salvatore ◽

Pedro Arrazola ◽

Joel Rech ◽

...

Keyword(s):

Surface Roughness ◽

Material Removal ◽

Direct Shear Test ◽

Shear Test ◽

Shear Resistance ◽

Arbitrary Lagrangian Eulerian ◽

Eulerian Model ◽

Drag Forces ◽

Drag Finishing ◽

Surrounding Liquid

Drag finishing is a widely used superfinishing technique in the industry to polish parts under the action of abrasive media combined with an active surrounding liquid. However, the understanding of this process is not complete. It is known that pyramidal abrasive media are more prone to rapidly improving the surface roughness compared to spherical ones. Thus, this paper aims to model how the shape of abrasive media (spherical vs. pyramidal) influences the material removal mechanisms at the interface. An Arbitrary Lagrangian–Eulerian model of drag finishing is proposed with the purpose of estimating the mechanical loadings (normal stress, shear stress) induced by both abrasive media at the interface. The rheological behavior of both abrasive slurries (media and liquid) has been characterized by means of a Casagrande direct shear test. In parallel, experimental drag finishing tests were carried out with both media to quantify the drag forces. The correlation between the numerical and experimental drag forces highlights that the abrasive media with a pyramidal shape exhibits a higher shear resistance, and this is responsible for inducing higher mechanical loadings on the surfaces and, through this, for a faster decrease of the surface roughness.

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