Abstract
Foundation piles transfer the applied vertical load to the surrounding soil by skin friction and base resistance. These two components induce stress in the soil. The load transfer is still not fully recognized, and some pile load tests analyses have raised many doubts. The present paper aimed to measure the stress levels during pile load tests in laboratory conditions. This research examined the possibilities of using thin, flexible sensors in measuring the stress in soil. Two sensors were used: tactile pressure sensor with mapping system and color film pressure sensors with digital analyzing. Calibration and preliminary tests of the sensors have been described. This calibration proved that this kind of sensor could measure the stress in the soil in laboratory conditions. The results of stress distribution in the soil, shown as pressure maps, have been presented. Significant stress changes were observed in pile load tests. Rough and smooth piles were compared in the analyses. Stress distribution was the result of simultaneous interaction of pile skin and base. The knowledge about stresses surrounding the pile allows us to carry out a deeper analysis of the pile–soil interaction.
Highlights
Faculty of Civil and Environmental Engineering, West Pomeranian University of Technology, Piastów 50a, Citation: Żarkiewicz, K.; Qatrameez, Abstract: Foundation piles transfer the applied vertical load to the surrounding soil by skin friction and base resistance
This paper presents laboratory measurements of stress in the soil surrounding the pile by using advanced technology represented in tactile sensors (Tekscan) and pressure film sensors (4 LW and 5 LW) to evaluate and calibrate the soil stress during a pile load test in laboratory conditions
It proves that the surrounding soil stresses that come from the pile skin and base resistance are interdependent, especially in the surrounding soil near the base of the pile
Summary
Faculty of Civil and Environmental Engineering, West Pomeranian University of Technology, Piastów 50a, Citation: Żarkiewicz, K.; Qatrameez, Abstract: Foundation piles transfer the applied vertical load to the surrounding soil by skin friction and base resistance. These two components induce stress in the soil. Calibration and preliminary tests of the sensors have been described This calibration proved that this kind of sensor could measure the stress in the soil in laboratory conditions. The tactile sensor has recently become crucial in various technologies One of these technologies is engineering, for detecting objects and their weight under outside effects such as loads and forces. Paikowsky and Hajduk [5] described the main application of the technology for geotechnical engineering
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