RT info:eu-repo/semantics/article
T1 The energy threshold in dynamic probing
A1 Ibáñez García, Sergio
A1 Sagaseta, César
A1 Fernández del Rincón, Alfonso
K1 Correlation
K1 Penetration
K1 Dynamic
K1 Probing
K1 Energy
K1 Threshold
K1 Ingeniería civil
K1 Civil engineering
AB In dynamic probing tests, penetration is closely related to the potential energy of the hammer (nominal energy). This energystems 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 transmissionthrough the rods has to be subtracted, as well as the energy loss due to the skin friction of the rods along the soil aroundthem. It is also necessary to add the energy due to the rod weight penetrating the soil. The main hypothesis assumed and laterexperimentally proved in this paper is based on the fact that ENTHRUcone has to be greater than a certain value or minimumenergy (energy threshold: Th) in order to be able to cause penetration. After analyzing more than one hundred blows withdifferent hammer mass and drop height, a small but consistent Th and a linear relationship between energy and penetrationbeyond it were found. The energy that really produces penetration (ENPEN) will be ENTHRUcone, minus Th. This allows forimproved energy corrections and correlations between results from various kinds of penetration tests.
PB Springer Nature
SN 1435-9529
YR 2022
FD 2022-10
LK http://hdl.handle.net/10259/7398
UL http://hdl.handle.net/10259/7398
LA eng
NO The writers would like to express their gratitude to the University of Burgos, the University of Cantabria, and Sondeos del Norte, S.A. and especially to José Manuel Sánchez Alciturri, the mastermind of this research.
DS Repositorio Institucional de la Universidad de Burgos
RD 04-may-2024