基于PIV技术与分形理论的桩–土系统水平循环受荷模型试验研究

doi:10.13722/j.cnki.jrme.2022.0598

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Abstract As one of the common forms of foundations for the wind turbine，monopile is often subjected to cyclic lateral loading，which can lead to changes in the dynamic response of the pile-soil system. In order to investigate the internal force variation and the cumulative deformation characteristics of the monopile，a series of model tests were carried out by varying two parameters：the relative density and the particle size of the soil. And the movement law of the soil around the pile under cyclic loading was analysed by the PIV technique and fractal theory. The test results showed that：(1) The influence of cyclic loading on the bending moment of the pile was relatively significant. With the increase of the number of cycles，the magnitude of the bending moment reduced，and the amplitude rose with the increase of the relative density of the soil. In addition，the smaller the particle size of the soil around the pile，the larger the bending moment. (2) The monopile rotated rigidly around a point. The amount of cumulative deformation of the pile decreased with the increase in the relative density. The interfacial friction angle of the sand-steel contact surface was affected by the particle size of the soil. The larger the particle size，the smaller the interfacial friction angle and the larger the lateral cumulative displacement of the pile. (3) The displacement range of the surface soil decreased with the increase in the relative density of the soil，and the particle size had less influence on the displacement field. As the loading progressed，the displacement range of the soil behind the pile increased，while the displacement range of the soil in front of the pile decreased，and convective movement occurred in part of the soil along the loading direction. (4) The displacement field of the soil around the pile exhibited fractal characteristics，and the fractal dimension value decreased with the increase in the relative density of the soil，varying between 1.18 and 1.42. The fractal dimension showed a positive linear relationship with the area of the soil displacement field and an exponential function with the number of cycles. Four sets of fitting formulas were proposed，and the results fit well with the existing data. The results of this research can provide an experimental basis for exploring the stability evaluation of the pile-soil system under lateral cyclic loading.

Key words： pile foundation cyclic loading pile soil interaction PIV technique fractal theory model experiment

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	Articles by authors
	YUAN Bingxiang1
	LI Zhijie1
	CHEN Weijie1
	LUO Qingzi1
	YANG Guanghua2
	WANG Yonghong3

Cite this article:

YUAN Bingxiang1,LI Zhijie1,CHEN Weijie1, et al. Experimental study on lateral cyclic loading model of pile-soil system based on PIV technique and fractal theory [J]. , 2023, 42(2): 466-482.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0598 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/I2/466

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