Lateral Cyclic Loading of Sand-Installed Piles

Abstract

The present study was conducted to examine the behaviour of instrumented ‰exible piles in dry sand under lateral cyclic loading using centrifuged models. Considering load service conditions, the in‰uence of the number of cycles of their amplitude and of the soil density on the pile cap displacement and the maximum bending moment of the pile is examined. An empirical law to evaluate pile head displacements at application point is proposed. From the bending moment proˆle recorded during loading, P-y reaction curves are identiˆed. A reduction coe‹cient r (P-multiplier) is introduced to quantify the eŠects of cyclic loads on P-y curves.

Three-dimensional numerical modelling of the behaviour of a pile subjected to cyclic lateral loading

“…The simplest way to adapt such methods is to extend the static p-y curves in the cyclic domain (API [1]). An attempt to do so has been carried out on the basis of experimental centrifuge tests for a small number of cycles by Rosquoet et al [36] and, more recently, for a larger number of cycles by Rakotonindriana [3].…”

Development of a rig to study model pile behaviour under repeating lateral loads

“…Achmus et al (2009) reported degradation of the absolute secant stiffness for medium dense and dense sands with increasing number of load cycles. However model studies on monopiles in loose LeBlanc et al, 2010) and dense (Cuéllar et al, 2012, Rosquoet et al, 2007 sands suggested that the foundation stiffness (cyclic) increases with the number of load cycles. LeBlanc (2009), Bhattacharya and Adhikari (2011) and Cuéllar et al (2012) suggested that the stiffness increase occurs as a result of densification of the soil next to the pile.…”

“…Under two-way loading, the pilehead is sequentially pulled in opposite directions, such that the pile tends to deflect (rotate) alternately in opposing directions from its mean vertical position (Peng et al, 2011). For two-way lateral loading, the accumulative tilt of the pile usually follows the direction of the first quarter of the loading cycle (Long and Vanneste, 1994;Rosquoet et al, 2007). Some researchers (LeBlanc et al, 2010;Klinkvort and Hededal, 2013;Zhu et al, 2013) have shown that two-way lateral loading produces higher rates of accumulation of lateral strain in the surrounding soil compared with one-way lateral loading.…”

Evaluation of Carbonation Effects on Cement-Solidified Contaminated Soil Used in Road Subgrade

“…Numerous researchers have studied S/S process to immobilize heavy metal by means of various S/S agents such as cement, quicklime, hydrated lime, fly ash, and cement kiln dust [17,18]. Cement is widely used in S/S due to its relative low price and significant improvement for the structural capacity of soil [19].…”