1. Investigation on the long-term performance of model monopile jacked in structured clays.
- Author
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Zhou, Pan, Li, Jingpei, Liu, Gengyun, Miraei, Seyedmohsen, and Zhang, Chaozhe
- Subjects
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PORE water pressure , *LEAD in soils , *PILES & pile driving , *RADIAL stresses , *CLAY - Abstract
Soil setup has a significant contribution to the performance of jacked piles in natural clays with structure characteristics. In this paper, a series of model pile tests are conducted to investigate the pile setup in structured clays, focusing on the influence of soil structure on time-dependent pile response. Three artificially structured clays are prepared as model soils to avoid the sampling challenge of undisturbed clays. The model tests are capable of modeling pile response through installation, equalization, and loading, and hence the initial structure and stress-induced structure degradation of clays, as well as the following thixotropic effect and reconsolidation of disturbed clays, can be adequately incorporated. Meanwhile, the behaviors of the piles and pile–soil interface are constantly monitored by the measurement system during and after pile installation. The results demonstrate that by increasing the cement content of structured clays from 0 to 4%, the penetration resistance is almost doubled, and the pore water pressure (PWP) and radial stress of the pile–soil interface located 20 cm from the pile toe increase by 1.27 and 1.38 times, respectively. A higher cement content in model soils leads to a quicker dissipation of excess pore water pressure (EPWP) due to the presence of a larger void structure and a smaller zone of damage caused by pile driving in structured clays. The growth rate of the ultimate bearing capacity of piles increases sharply with the cement content. The normal stress of the interface first decreases slightly and then grows dramatically with the mobilized shear stress during static loading tests. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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