摘要
为研究水泥土中大直径单桩的水平承载性能,开展了水泥土中大直径单桩水平承载性能离心机试验,分析了加固前后桩基水平承载力、弯矩和水平土抗力-水平位移(p-y)曲线的变化规律.基于黏土典型p-y曲线,考虑土体径向非均质性和桩径效应,修正初始地基反力模量和极限土抗力,提出了一种适用于水泥土加固桩水平承载力的计算模型.结果表明,相比未加固桩,加固桩的水平承载力明显提升,单桩初始刚度和极限承载力分别增加2.61倍和6.29倍.加固桩和未加固桩的桩身弯矩随荷载和深度变化趋势大致相同,但加固桩的最大弯矩位于泥面附近.水泥土加固可以提高桩身p-y曲线的初始刚度和极限土抗力,进而提高桩基水平承载力.计算值与实测值吻合较好,从而验证了所提计算模型的合理性.
To study the lateral bearing behaviors of large-diameter monopiles in cement-soil,the centrifuge tests of large-diameter monopiles in cement-soil were conducted.The change rules of the lateral bearing capacity,the bending moment and the lateral soil resistance-lateral deflection(p-y)curves for reinforced and unreinforced monopiles were analyzed.Based on typical p-y curves of the clay,the initial foundation reaction modulus and the ultimate soil resistance were revised to obtain a calculation model for the lateral bearing capacity of large-diameter monopiles by considering the radial inhomogeneity of surrounding soil and the dimensional effect.The results show that comparing the unreinforced piles,the ultimate bearing capacity of reinforced piles is significantly improved.The initial stiffness and the ultimate bearing capacity of a single pile increase by 2.61 and 6.29 times,respectively.The bending moments of the reinforced and unreinforced piles have same variation tendency along the loading and depth,but the maximum bending moment of the reinforced pile is located near the mud surface.Cement-soil reinforcement can improve the initial stiffness and the ultimate soil resistance of the p-y curves,increasing the lateral bearing capacity of the pile foundation.The calculated values and measured ones agree well,which verifies the rationality of the proposed calculation method.
作者
高鲁超
戴国亮
姚中原
张继生
王安辉
陈浩
Gao Luchao;Dai Guoliang;Yao Zhongyuan;Zhang Jisheng;Wang Anhui;Chen Hao(Key Laboratory of Ministry of Education for Coastal Disaster and Protection,Hohai University,Nanjing 210098,China;Clean Energy Branch,Huaneng International Power Jiangsu Energy Development Co.,Ltd.,Nanjing 210009,China;School of Civil Engineering,Southeast University,Nanjing 211189,China;China Construction Industrial and Energy Engineering Group Co.,Ltd.,Nanjing 210023,China)
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2024年第1期142-148,共7页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(52078128)
江苏省自然科学基金资助项目(BK20210051)
河海大学海岸灾害及防护教育部重点实验室开放基金资助项目(202303)。
关键词
海上风电
大直径单桩
水泥土
水平承载性能
离心机试验
offshore wind turbines
large-diameter monopiles
cement-soil
lateral bearing behaviors
centrifuge tests
