STUDY ON MECHANICS AND PORE STRUCTURE CHARACTERISTICS OF RESIDUAL SOIL IN WIND TURBINE FOUNDATION UNDER DRYING-WETTING CYCLES

Deng Zongwei; Qi Shu; Fan Zijian; Zhou Yanming

doi:10.19912/j.0254-0096.tynxb.2024-1953

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (3) : 316-323. DOI: 10.19912/j.0254-0096.tynxb.2024-1953

STUDY ON MECHANICS AND PORE STRUCTURE CHARACTERISTICS OF RESIDUAL SOIL IN WIND TURBINE FOUNDATION UNDER DRYING-WETTING CYCLES

Deng Zongwei¹, Qi Shu², Fan Zijian³, Zhou Yanming³

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Abstract

Wind turbine foundation soils in mountainous regions are often subjected to harsh climatic conditions characterized by intense rainfall and rapid evaporation, which may potentially induce structural deterioration in compacted residual soils. To investigate the effects of rainfall and solar drying on the structural damage characteristics of compacted residual soils in wind turbine foundations in mountainous areas, consolidated drained triaxial tests, scanning electron microscopy （SEM） examinations, and mercury intrusion porosimetry （MIP） tests were conducted on residual soils from wind turbine foundations in the mountainous region of Chenzhou, under 0 to 4 drying-wetting cycles. The results show that cohesion exhibits an exponential decay trend with an increasing number of drying-wetting cycles, decreasing by 37.57% after 4 cycles, whereas the internal friction angle remains almost unaffected. During water absorption, clay minerals expand, while during drying, internal stress imbalance caused by soil volume changes generates additional pores and cracks within the soil samples. This leads to alterations in the microstructure and ultimately results in the degradation of macroscopic mechanical properties. After four drying-wetting cycles, the volume proportions of micropores and small pores decreased by 1.8% and 11%, respectively, whereas the volume proportions of mesopores and macropores increased by 7.4% and 5.4%, respectively. The shear strength of the foundation residual soil exhibits a linear negative correlation with the average pore diameter. These findings are significant for understanding the mechanical behavior and microstructural evolution of residual soils in wind turbine foundations.

Key words

wind turbines / mechanical properties / micro structure / soil mechanics / drying-wetting cycles / triaxial test / residual soil

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Deng Zongwei, Qi Shu, Fan Zijian, Zhou Yanming. STUDY ON MECHANICS AND PORE STRUCTURE CHARACTERISTICS OF RESIDUAL SOIL IN WIND TURBINE FOUNDATION UNDER DRYING-WETTING CYCLES[J]. Acta Energiae Solaris Sinica. 2026, 47(3): 316-323 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1953

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