东南大学学报（自然科学版）2026，Vol.56Issue(10)：1455-1465,11.DOI:10.3969/j.issn.1001-0505.2026.10.010
早龄期喷射混凝土单轴静力学特性与宏细观损伤特征研究
Study on uniaxial static mechanical properties and macro-meso damage characteristics of early-age shotcrete
摘要
Abstract
To investigate the evolution law of early-age mechanical properties and damage characteristics of shotcrete in a deep-buried plateau railway tunnel,X-ray diffraction(XRD)tests,uniaxial compression tests,and computed tomography(CT)scanning tests were carried out on four types of specimens at different ages.The hydration product distribution,stress-strain curves,and CT slices of early-age shotcrete were obtained.Three constitutive models were used to fit the dimensionless stress-strain curves,and the fractal theory was combined to conduct quantitative analysis on the cracks in the slices.The results show that with the progress of hydration,the early-age performance of shotcrete improves gradually,and the compressive strength with the age of 5 d reaches more than 90%of the design value.Among the three constitutive models,the correlation co-efficients of the Guo Zhenhai model exceeds 94%,and the constitutive model of early-age shotcrete is obtained after modification.The average box dimensions of shotcrete with the age of 1,3,5,7 d are 1.764 8,1.776 2,1.759 2,1.761 7,respectively.By contrast,the box dimensions with the age of 1 and 3 d are larger,indicating that the cracks have a higher degree of irregularity,more complex geometric characteristics,and more severe overall damage.关键词
喷射混凝土/单轴压缩/CT扫描/本构模型/分形Key words
shotcrete/uniaxial compression/computed tomography(CT)scanning/constitutive model/fractal分类
建筑与水利引用本文复制引用
谢全民,徐永康,郑智彬,周辉,马俊,乔磊..早龄期喷射混凝土单轴静力学特性与宏细观损伤特征研究[J].东南大学学报（自然科学版）,2026,56(10):1455-1465,11.基金项目
国家自然科学基金资助项目(52378399) （52378399）
湖北省基础研究类平台专项资助项目(2025CSA072) （2025CSA072）
湖北省中央引导地方科技发展专项资助项目(2024CSA094). （2024CSA094）
