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| Experimental study on the anti-jacking-up performance of a screw pile for photovoltaic stents in a seasonal frozen region |
| Teng-fei Wang, Jian-kun Liu, Hua-gang Zhao, Ya-long Shang, Xiao-qiang Liu |
| School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China; North China Power Engineering Co., Ltd. of China Power Engineering Consulting Group, Beijing 100011, China |
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Abstract The soils in seasonal frozen regions freeze and thaw frequently, causing severe frost heave and thaw settlement problems, which bring challenges to piles of photovoltaic stents. In this paper, laboratory tests are conducted with different types of screw piles under freezing conditions, with also using smooth piles for contrast. The aim is to simulate the freezing process of screw piles according to practical working conditions based on the similarity principle. Internal thermal resistance is ignored. The change laws of temperature, displacement, as well as the influence factors of types of screw piles are analyzed. The results indicate that: with a freezing depth of 30 cm, which is half of the pile length, large-double-bladed screw piles perform the best in anti-jacking-up, while all-bladed screw piles perform the worst, independent of the types of soil samples tested. The fitting relationship between jacking-up displacement and freezing depth is also proposed for each type of pile. Results obtained can provide an important reference to site construction in seasonal frozen regions.
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Received: 01 June 2016
Published: 05 July 2016
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