EXPERIMENT STUDY ON INCLINED PULLOUT BEARING CHARACTERISTIC OF SCREW ANCHOR PILE OF PHOTOVOLTAIC BRACKET

Hu Wei; Yang Yao; Liu Shunkai; Lin Zhi; Wu Qiuhong; Huang Yongxiang

doi:10.19912/j.0254-0096.tynxb.2022-0729

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (12) : 50-61. DOI: 10.19912/j.0254-0096.tynxb.2022-0729

EXPERIMENT STUDY ON INCLINED PULLOUT BEARING CHARACTERISTIC OF SCREW ANCHOR PILE OF PHOTOVOLTAIC BRACKET

Hu Wei^1,2, Yang Yao², Liu Shunkai², Lin Zhi², Wu Qiuhong³, Huang Yongxiang⁴

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Abstract

In view of the insufficient understanding of the bearing characteristic of screw anchor pile of photovoltaic bracket under inclined loading, inclined pullout test of large size screw anchor pile with single blade is carried out in sand. The study focuses on the influence regulation of load angle and buried depth ratio on bearing characteristic, the variation of soil pressure distribution on the surface of anchor blade, and the inclined pullout bearing control mechanism. The main conclusions are as follows：（1） The load-displacement curves are generally hardening type, with the same loading angle, the greater the buried depth ratio, the greater the pullout limit load and the corresponding displacement; with the same buried depth ratio, the curve becomes steeper as the loading angle increases, and the ultimate load increases, but the corresponding displacement decreases. （2） There are significant differences between load-horizontal displacement curve and load-vertical displacement curve, the former curve is complete and the nonlinear development is sufficient. Besides the vertical pullout, and the vertical ultimate displacement at other loading angles is far less than the horizontal ultimate displacement. （3） The ratio of inclined pullout capacity T_U(a) to the vertical pullout capacity T_u(90°) with the same burial depth ratio is linear with the loading angle. （4） Soil pressure on anchor blade is influenced by two anchor-soil interaction mechanisms, The maximum soil pressure coefficient is related to the burial depth ratio and the friction angle of soil, the value of which can reach nearly twice of the passive soil pressure coefficient. （5） In the range of [0°,65°], the inclined pullout bearing characteristics of screw anchor pile is controlled by horizontal loading, while in the range of [65°,90°], that is controlled by vertical loading. The vertical component of the inclined loading can improve the horizontal bearing capacity of screw anchor pile, but it can be regarded as a safety reserve in the design judgement.

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PV power screw anchor pile / inclined loading / bearing characteristic / soil pressure intensity / control mechanism

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Hu Wei, Yang Yao, Liu Shunkai, Lin Zhi, Wu Qiuhong, Huang Yongxiang. EXPERIMENT STUDY ON INCLINED PULLOUT BEARING CHARACTERISTIC OF SCREW ANCHOR PILE OF PHOTOVOLTAIC BRACKET[J]. Acta Energiae Solaris Sinica. 2022, 43(12): 50-61 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0729

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