Dynamic response of single-bucket foundation in clay under vertical variable amplitude cyclic loadings

Experimental Study on Mechanical Behavior of Skirt–Pile Foundations in Saturated Clay under Horizontal Load

“…The skirt design is similar to that of the bucket foundation, featuring a capped top and an open bottom. The study of skirt-pile foundations builds upon research on traditional bucket foundations [5][6][7]. The offshore wind power team of Tianjin University [8][9][10] developed a wide and shallow composite foundation for wind conditions and addressed the characteristics of China's offshore wind farms.…”

Vertical Monotonic and Cyclic Responses of a Bucket in Over-Consolidated Clay

“…For the bucket in sand over clay, the direction of w a was also governed by V a [25]. As for the bucket in clay, a few conventional [11,29] and centrifuge [30,31] model tests have been conducted. Given that the bucket was displaced under undrained conditions, the direction of w a and the failure mechanism were a function of the direction of V a : zero and tensile V a leaded to upwards w a , while compressive V a larger than a small level, for example, 9% of the monotonic vertical capacity, may always generate downward w a [31].…”

“…The displacement accumulated was observed under force-controlled loading, while the vertical resistance was degraded by about 35% in the first ~10 cycles and became stable at ~20 cycles if one-way cyclic loading with a small amplitude of ~0.009D was applied [33]. The stiffness was lower at higher V c under purely compressive loading with ζ c = 0 and a logarithmic function was used to describe the relationship between stiffness and the number of cycles [29]. For the bucket in clay subjected to cyclic loading, most existing studies were focused on the responses under horizontal cyclic loading [34][35][36][37].…”

“…For the bucket in clay subjected to cyclic loading, most existing studies were focused on the responses under horizontal cyclic loading [34][35][36][37]. The bucket under cyclic vertical loading was concerned in a limited number of recent studies only, such as by [29,33], however, their model tests were conducted at 1 g. Since the stress levels of soil are much lower than those in practical applications, the centrifuge test is preferred to provide more reliable data, especially for the loading with larger V c . In this paper, the load-displacement responses of the single bucket in clay und monotonic and symmetric cyclic vertical loading (ζc = −1) are investigated by centrifu tests.…”