Cluster analysis for the determination of the undrained strength tendency from SPT in mudflows and residual soils

Viviescas, Juan Camilo; Osorio, Juan Pablo; Griffiths, D. V.

doi:10.1007/s10064-019-01472-8

Cited by 13 publications

(1 citation statement)

References 26 publications

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“…Similarly, the correlation coefficients (R), as seen in Table 6, indicate a strong relationship between the variables. Values of R and R 2 are high enough, even though not any outlier has been discarded from this research, unlike some authors (Viviescas et al 2019) that have proven to be reasonable to exclude some SPT outliers for researching. Obviously, discarding outliers would have even increased the values of R and R 2 .…”

Section: Discussionmentioning

confidence: 95%

The energy threshold in dynamic probing

García

Sagaseta

Rincón

2022

Bull Eng Geol Environ

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In dynamic probing tests, penetration is closely related to the potential energy of the hammer (nominal energy). This energy stems from the mass and free fall of the hammer after being released from a certain height. Penetration depends on energy, although only on a portion of that nominal energy that is effectively transferred to the rods (ENTHRU) and, more precisely, the energy that reaches the cone (ENTHRUcone). ENTHRU can be measured by monitoring the upper part of the drive rods. To calculate ENTHRUcone, ENTHRU needs to be corrected in three ways. Firstly, the energy loss in the energy transmission through the rods has to be subtracted, as well as the energy loss due to the skin friction of the rods along the soil around them. It is also necessary to add the energy due to the rod weight penetrating the soil. The main hypothesis assumed and later experimentally proved in this paper is based on the fact that ENTHRUcone has to be greater than a certain value or minimum energy (energy threshold: Th) in order to be able to cause penetration. After analyzing more than one hundred blows with different hammer mass and drop height, a small but consistent Th and a linear relationship between energy and penetration beyond it were found. The energy that really produces penetration (ENPEN) will be ENTHRUcone, minus Th. This allows for improved energy corrections and correlations between results from various kinds of penetration tests.

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Section: Discussionmentioning

confidence: 95%