Study on Bearing Capacity of Belled Uplift Piles in Soft Clay Area
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TECHNICAL NOTE
Study on Bearing Capacity of Belled Uplift Piles in Soft Clay Area Mingyuan Yu1 • Baoguo Liu1 • Qi Wang1 • Yu Song1
Received: 3 September 2019 / Accepted: 10 February 2020 Indian Geotechnical Society 2020
Abstract The study on the bearing capacity characteristics of the belled uplift piles in soft clay foundation is of guiding significance for the type selection and bearing performance of the piles. A full-scale test on the uplift piles in soft clay was carried out in Qianhai District of Shenzhen. The test results show that the belled uplift piles are applicable to the soft clay. Compared with the equal section uplift piles, the Q–S curves are smoother, the ultimate bearing capacity can be increased by more than 50%, and the piles perform more stability in the later stage of the test. The displacement of pile foundation, the elongation of pile body and the rebound ratio of pile foundation are studied. The results show that the foundation with the belled uplift piles are applicable in the soft clay areas, and the smallangle belled uplift pile head suitable for the soft clay area is proposed, which is of great significance for the popularization and use of the belled uplift piles. Keywords Belled uplift pile Equal section uplift pile Uplift bearing capacity Bearing characteristics
Introduction The groundwater level is relatively high in the coastal areas of eastern China, the foundation of modern buildings near the offshore will probably float, which could increase construction difficulty. Generally, equal section uplift pile is the most widely used type of pile foundation in the & Mingyuan Yu [email protected] 1
School of Civil Engineering, Beijing Jiaotong University, 100044 Beijing, China
modern society; however, belled uplift pile is the more effective type in the anti-floating of the underground buildings like shopping malls, subway structures, basement buildings, etc. Compared with the equal section uplift piles, the bearing capacity of the belled uplift piles is higher and more beneficial to the engineering [1–3]. Since the last century, many scholars have conducted laboratory model tests to study the bearing characteristics of the pile model in sandy soil. Meyerhof and Adams [4] found the foundation failure mechanism could change with increasing depth. Dickin and Leung [3, 5] concluded that the vertical slip surface failure model should be most suitable for sandy soil pile through indoor centrifugal tests. Krishnaswamy and Parashar [6] stated that both non-cohesive and cohesive soil can be used to improve the uplift resistance of plate anchors and plinths. Alawneh and Husein [7] proved that the bearing capacity of the uplifted piles in dense sand is much higher than that of the uplifted piles in loose sand. Ilamparuthi and Dickin [8, 9] established the hyperbolic relationship of the drawing load and the displacement to determine the strength of soil in the nonlinear analysis. Nazir and Nasr [10] concluded that the pullout resistance of the inclined piles was 21–31% higher than
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