Field Tests of Drag Loads on Prestressed Pipe Piles in Deep Soft Soil of Large Fill Sites

YU Jianfei; ZHANG Jing; YANG Shifei

doi:10.13204/j.gyjzG20110501

Volume 52 Issue 1

Apr. 2022

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YU Jianfei, ZHANG Jing, YANG Shifei. Field Tests of Drag Loads on Prestressed Pipe Piles in Deep Soft Soil of Large Fill Sites[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(1): 143-149,64. doi: 10.13204/j.gyjzG20110501

Citation:

YU Jianfei, ZHANG Jing, YANG Shifei. Field Tests of Drag Loads on Prestressed Pipe Piles in Deep Soft Soil of Large Fill Sites[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(1): 143-149,64. doi: 10.13204/j.gyjzG20110501

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Field Tests of Drag Loads on Prestressed Pipe Piles in Deep Soft Soil of Large Fill Sites

doi: 10.13204/j.gyjzG20110501

1. Zhejiang Petroleum & Chemical Co., Ltd., Zhoushan 316021, China;
2. SGIDI Engineering Consulting (Group) Co., Ltd., Shanghai 200093, China

Received Date: 2020-11-05
Available Online: 2022-04-24

Abstract

Abstract

Field tests of drag loads for prestressed pipes pile were performed in a petrochemical engineering in Zhoushan in which the backfill and underlying soft soil were 10 m and 50 m respectively. After unloading of surcharge preloading, prestressed pipe piles with different length were piled. Based on field tests, influences of relative displacement and relative displacement rates between piles and soil on drag loads, coefficients of negative friction and neutral points were studied. The results showed that there existed a positive correlation between drag loads and relative displacement between piles and soil. Growth rates of drag loads decreased with decrease of relative displacement rates between piles and soil. When relative displacement rates between piles and soil reduced to 0.1 to 0.2 mm/d, drag loads tended to be stable. Average values of negative friction could be tested by the suspension method. The calculation methods about coefficients of negative friction and neutral points were proposed according to the measured values in different pile length. The field test results showed that negative friction increased with time and the depth of neutral points in piles would increase as well. In the end, the increase of the depth for neutral points tended to be stable,negative friction was much less than the ultimate value of positive friction. The characteristic value of the bearing capacity of single piles was checked by the comprehensiely safe factor method considering the negative friction from JGJ 94-2018 Technical Code for Building Pile Foundation, the results showed the piles could meet safety requirements.
- field test of drag load,
- large filling,
- deep soft soil,
- coefficient of negative friction,
- neutral point,
- bearing capacity of pile foundation

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References(27)

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