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Geomechanics and Engineering
  Volume 21, Number 6, June25 2020 , pages 565-570
DOI: https://doi.org/10.12989/gae.2020.21.6.565
 


Study on large tonnage pile foundation load test system and field test of long rock-socketed pile
Xue-feng Zhang, Ying-sheng Ni, Chun-xia Song and Dong Xu

 
Abstract
    Large tonnage pile foundation load test system is designed in this paper by using pre-stressed technique to optimize the design of anchor pile reaction beam system, in which project pile can be successfully taken as anchor pile. The test results show that the cracks and excessive deformations of the prestressed anti-force device designed in this study have not occurred, and the prestressed tendons of the anchor pile ensure that the anchor pile will not be pulled and fractured, and the prestressed tendons can be reused, thus ensuring the safety and reliability of the test. This test method can directly test bearing capacity of long rock-socketed piles, and analysis bearing behaviors from test results of sensors which embedded in the pile. Through test studied, authors summarized the vertical bearing characteristics of long rock-socketed piles and the main problems that should be paid attention to during design and construction, and provided reliable solutions.
 
Key Words
    load test system; long rock-socketed pile; vertical bearing capacity
 
Address
Xue-feng Zhang, Ying-sheng Ni and Chun-xia Song: Research Institute of Highway Ministry of Transport, M.O.T, Beijing, 100088, P.R. China

Dong Xu: Department of Bridge Engineering, Tongji University, Shanghai, 200092, P.R. China
 

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