Behavior of Laterally Top-Loaded Deep Foundations in Highly Porous and Collapsible Soil

Behavior of a new laterally top-loaded post-grouted micropile in highly porous lateritic soil

“…To investigate the behavior of this new type of micropile, a new testing site was set up at FEAGRI, UNICAMP. This new facility provided supplementary characterization to the local subsoil in addition to other works carried out in two other experimental fields at UNICAMP and extensively evaluated in recent bibliographies [12][13][14][15][16][17][25][26][27][28][29]. The main geological and geotechnical characteristics of the new experimental field, the new post-grouted micropile installation process and the loading test assemblage and procedure are presented below.…”

“…Posteriorly, Miguel et al [15] tested two TR37 section steel-rail anchor piles at the respective field, one with a single section and the other with a double section and lengths of 12 and 18 m, respectively. Kassouf et al [16] and Albuquerque et al [17] studied the behavior of a belled caisson with 0.8 m in diameter, 9 m in depth, and 1.6 m in base diameter at the experimental site. Lastly, Albuquerque et al [17] also presented the results for a CFA pile and a bored pile, both with 12 m length and 0.40 m diameter, and a steel pile with the same length.…”

“…Kassouf et al [16] and Albuquerque et al [17] studied the behavior of a belled caisson with 0.8 m in diameter, 9 m in depth, and 1.6 m in base diameter at the experimental site. Lastly, Albuquerque et al [17] also presented the results for a CFA pile and a bored pile, both with 12 m length and 0.40 m diameter, and a steel pile with the same length. Excepting the study by Zammataro [14] and some cases of Miranda Junior [13], all tests mentioned previously were performed in natural soil moisture condition and after its full saturation, i.e., less favorable situation for the respective soil profile.…”

“…Considering the little available information in the literature concerning about horizontally top-loaded micropiles and the lack of data on these foundation elements under this loading type in highly porous, collapsible, and lateritic soil, the present study aims to provide design parameters and to investigate the performance of four transversal load tests in a new post-grouted micropile configuration, with the soil at its natural moisture content and after-flooding. Based on the lateral loading tests, the effects of soil saturation on the load-displacement curve and on the horizontal reaction coefficient were verified, and their results were compared with those obtained for other pile types in the same geological-geotechnical context [12][13][14][15][16][17]. The results from lateral top-load movement curves were related based on the average loads to shift the pile head in 6 and 12 mm, and the design parameters were based on the average value in the range between these values [13,14,21].…”

Contribution to the forecast of horizontal displacements in continuous fight auger piles in granular soil profile

“…The analytical methods (Miche, 1930;Hetenyi, 1946;Matlock and Reese, 1961) are simpler and have been used in studies like Guo and Lee (2011), who concluded that the equation proposed by Hetenyi (1964) is comparable to numerical approaches if Winkler's parameters are estimated using the load transfer factor described in his study. Del Pino Jr. (2003) and Albuquerque et al (2019) obtained values for the horizontal coefficient of the soil using retro analysis, according to the method suggested by Matlock and Reese (1961). Zammataro (2007) showed that excluding the equation term that considers the distance between ground level and load application axis can influence the coefficient of horizontal soil reaction.…”