Comparative Study of Wind Turbine Foundation Reinforcement Schemes under Soft Ground Conditions
软弱地基条件下风电基础加固方案比选

摘要

伴随风电行业快速发展，软弱地基条件下风电基础设计与加固已成为工程建设中的关键技术问题。针对承载力不足、变形过大等问题，本文结合某风电场地质勘探与室内土工试验，分析了软弱地基承载力低、压缩性大、渗透性差等工程特性。基于风电基础荷载特征及变形控制要求，提出强夯法、水泥土搅拌桩、CFG 桩和预应力管桩 4种加固方案，并采用数值仿真与现场试验相结合的方法，对不同方案下地基承载力、沉降变形及稳定性进行了研究。在此基础上，构建综合评价体系，运用层次分析法和模糊综合评价法进行比较。结果表明，CFG 桩复合地基方案综合优势较为突出，预应力管桩适用于极软弱地基，强夯法适用于浅层软土加固。

Abstract

With the rapid development of the wind power industry, the design and reinforcement of wind turbine foundations under soft soil conditions have become key technical issues in engineering construction. Focusing on problems such as insufficient bearing capacity and excessive deformation, this study, based on geological investigation and indoor geotechnical tests conducted at a wind farm, analyzes the engineering characteristics of soft ground, including low bearing capacity, high compressibility, and poor permeability. According to the loading characteristics and deformation control requirements of wind turbine foundations, four reinforcement schemes were proposed: dynamic compaction, cement-soil mixing piles, CFG piles, and prestressed pipe piles. Numerical simulation combined with field testing was employed to investigate the bearing capacity, settlement deformation, and stability of the foundation under different schemes. On this basis, a comprehensive evaluation system was established, and the analytic hierarchy process and fuzzy comprehensive evaluation method were applied for comparison. The results show that the CFG pile composite foundation scheme has relatively prominent overall advantages, prestressed pipe piles are suitable for extremely soft ground, and dynamic compaction is suitable for the reinforcement of shallow soft soil.