Model Experiment Study on Vertical Bearing Characteristics of Large-Diameter Ring Piles

The hollow structure of large-diameter ring piles (LDRPs) reduces the amount of concrete used, is economically efficient, and reduces the weight of the pile. However, its bearing characteristics and safety performance are still not fully known. In this study, to determine the properties of the LDRP structure, a combination of the indoor scale model test and numerical simulations was used, and a new parameter, K, which is the thickness-to-diameter ratio, was introduced. A comparative study of LDRPs with different hollow ranges was conducted. The results show that for a value of K in the range of 0.2-1, the ultimate bearing capacity of LDRPs is not significantly different from that of large-diameter solid piles (LDSPs), and they can ensure sufficient safety reserves. Under ultimate bearing capacity, the strain on an LDRP is large, but it does not exceed its own material strength, and the strain variation law is similar to that of a solid pile. LDRPs show the characteristics of end-bearing piles, and concrete savings can reach up to 50% for K in the range of 0.2-1.

Automated summary

The hollow structure of large-diameter ring piles reduces concrete usage, improves cost efficiency, and reduces pile weight. This study utilized indoor scale model tests and numerical simulations to investigate the properties of the LDRP structure. The findings indicate that LDRPs exhibit similar bearing capacity to large-diameter solid piles within a specific range, ensuring sufficient safety reserves. Additionally, LDRPs can achieve concrete savings of up to 50%.