Field study of monotonic and cyclic lateral behaviour of piles in soft soils improved with and without vacuum preloading
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RESEARCH PAPER
Field study of monotonic and cyclic lateral behaviour of piles in soft soils improved with and without vacuum preloading Hongtao Fu1,2,3 • Jun Wang1,2,3 • Yuanqiang Cai4 • Jinqiang Jin5 • Quanyang Dong1 • Xiuqing Hu1 Peng Wang1 • Xueyu Geng6 • Dikang Zhang7
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Received: 10 August 2019 / Accepted: 3 February 2020 Ó Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Project Oufei is the largest individual reclamation project in Wenzhou city, China, and the main infrastructure consists of seawalls, sluices and separation dikes. These infrastructures face repeated horizontal forces from wind and waves; thus, it is essential to evaluate the lateral bearing of single pile used for sluice gates. This paper presents a case study on lateral monotonic and cyclic behaviour of bored piles in soft soils. Four instrumented piles were loaded monotonically and cyclically to assess the contribution of soil improvement by vacuum preloading with prefabricated vertical drains. The test results show that the ultimate horizontal capacities were 200 kPa and 100 kPa for piles in the treated zone and untreated zone, respectively, under monotonic loading and up to 220 kPa and 120 kPa for piles in the treated zone and untreated zone, respectively, under cyclic loading, indicating that the ultimate horizontal capacity of piles in the treated zone can meet the design requirement of 130 kPa. Moreover, soil improvement decreased the maximum bending moment of the bored piles and enhanced the pile head stiffness, and the influence depth of soil improvement is up to 10 m. This indicates that soil improvement by vacuum preloading with prefabricated vertical drains is effective and can be used for lateral loading in reclamation project. Keywords Bending moment Bored piles Cyclic load Field test Prefabricated vertical drains Vacuum preloading
1 Introduction & Jun Wang [email protected] 1
College of Architecture and Civil Engineering, Wenzhou University, Wenzhou 325035, People’s Republic of China
2
The Key Laboratory of Engineering and Technology for Soft Soil Foundation and Tideland Reclamation of Zhejiang Province, Wenzhou, People’s Republic of China
3
The Innovation Centre of Tideland Reclamation and Ecological Protection, Wenzhou University, Wenzhou 325035, Zhejiang, People’s Republic of China
4
Zhejiang University of Technology, Hangzhou 310014, People’s Republic of China
5
Wenzhou Oufei Development and Construction Investment Group Co., Ltd, Wenzhou 325035, Zhejiang, People’s Republic of China
6
School of Engineering, University of Warwick, Coventry CV4 7AL, UK
7
Zhejiang Industry and Trade Vocational College, Wenzhou 325035, People’s Republic of China
Nowadays, vacuum preloading is a common and effective method used to improve soft clayey soil deposit. Although the principle of vacuum consolidation was proposed as early as the 1950s [14], its regular use in engineering applications did not commence until much later in the 1980s. The tran
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