###### Abstract
[9] conducted unconfined compressive strength tests on the structured clay of the Zhanjiang Formation to investigate the changes in basic physical parameters, such as soil water content and pore size, during the thixotropic process, establishing a thixotropic measurement standard for the structured clay of the Zhanjiang Formation. [PERSON] et al. [10] explored the thixotropic behavior of marine clay by examining the relationship trends between thixotropic strength ratios, flow index, and moisture content. The above research explored thixotropy from various aspects, including the interactions between soil particles and the mechanical properties of the soil, laying a foundation for the study of thixotropy in the structured clay of the Zhuhai Group. [PERSON] was the first to discover the phenomenon of pile bearing capacity changing over time, which he referred to as time-dependent behavior. This was followed by a series of studies conducted by scholars both domestically and abroad. [PERSON] et al. [11], through the study of the thixotropy of soft clay from a bay, found that due to the disturbance caused by pile driving, the strength of the soft clay changes significantly over time. The bearing capacity of the pile foundation exhibits notable time-dependent characteristics, with a rapid initial increase followed by a slower growth compared to the early stage. The uncertainty in the pile foundation bearing capacity does not provide accurate reference values for pile foundation design, posing risks to engineering safety and resulting in unnecessary costs. [PERSON] et al. [12] studied the time-dependent behavior of the bearing capacity of bored and cast-in-place uplift piles located in a clay-weathered granite foundation. They discovered that the uplift bearing capacity of these piles also exhibits significant time-dependent behavior, with earlier increases being more rapid compared to the later stages. This is attributed to the disturbance of the surrounding soil during pile installation and the recovery of the thixotropic properties of the slurry used for retaining walls. [PERSON] et al. [13] conducted intermittent reloading tests and static load tests on static pressure piles, discovering that the pile foundation exhibits significant time-dependence, with the thixotropy of the soil being a primary influencing factor on the bearing capacity of the pile foundation. [PERSON] et al. [14] investigated the uplift bearing capacity of bored and cast-in-place piles in sandy soil and weathered sandstone foundations. The results indicated that the uplift bearing capacity of the cast-in-place piles exhibits significant time-dependent behavior, primarily due to the thickness of the mud cake formed by the slurry used for wall support, with rapid initial increases and slower growth in the later stages. [PERSON] et al. [15] studied the recovery process of the bearing capacities of large-diameter steel pipe piles based on a project in West Africa. They found that the initial driving and re-driving of piles after different resting times display notable time-dependent behavior. The above studies analyzed the effects of thixotropy, consolidation effects, construction techniques, and different resting times on the time-dependent behavior of pile bearing capacity, providing insights for exploring the time-dependent behavior of uplift pile bearing capacity in the structural clay of the Zhanjiang Formation. In the design of uplift piles, determining their uplift bearing capacity is a crucial aspect. Many researchers have studied and proposed different methods for calculating uplift bearing capacity. For instance, [PERSON]. [16] and [PERSON]. [17] proposed a semi-empirical algorithm based on model tests of pullout piles. They only considered the increase in side friction resistance with depth and did not take into account the increase in side friction resistance caused by the surrounding soil over time. [PERSON] et al.