工程科学与技术2024，Vol.56Issue(3)：109-121,13.DOI:10.15961/j.jsuese.202300688
公路隧道喷射型ECC物理力学性能及其喷层稳定性
Physical and Mechanical Properties of Sprayable ECC in Highway Tunnels and its Spray Layer Stability
摘要
Abstract
Traditional fiber-reinforced cementitious composites(ECC)are limited in application due to their high cost and considerable shrinkage.Additionally,research on the stability of sprayable ECC layers in highway tunnels under excavation disturbance remains incomplete,with inad-equate monitoring and evaluation following its engineering applications.This study investigates the physical and mechanical properties of spray-able ECC in highway tunnels.It analyzes the stability of the surrounding rock and the sprayable ECC layer under excavation and evaluates the ap-plication effectiveness through field monitoring.The results indicate that the physical and mechanical properties of sprayable ECC can meet the requirements for shotcrete in highway tunnels by incorporating desulfurized gypsum,hybrid fiber,manufactured sand,an expansion agent,and a shrinkage-reducing agent into the ECC mix.Based on numerical simulations,for a 12-m support,the peak tensile and compressive principal stresses of the sprayable ECC layer increase by 36.8%and 28.4%,respectively,compared to the C25 shotcrete(C25SC)layer.The maximum ver-tical displacement of the inner arch reduces by 3.15%compared to C25SC to only 1.23 mm.Based on on-site monitoring,under the same geolo-gical conditions of the surrounding rock,sprayable ECC minimizes the vertical settlement deformation by 10.26%compared to C25SC.In addi-tion,no cracking or linear seepage is observed on the surface of the sprayable ECC layer.Therefore,sprayable ECC holds broad application pro-spects in highway tunnel support with appropriate modifications.关键词
喷射型ECC/公路隧道/物理力学性能/数值模拟/稳定性Key words
sprayable ECC/highway tunnel/physical and mechanical properties/numerical simulation/stability分类
交通工程引用本文复制引用
胡时,李晓芳,蔡海兵,韩辰悦,宋海清..公路隧道喷射型ECC物理力学性能及其喷层稳定性[J].工程科学与技术,2024,56(3):109-121,13.基金项目
安徽理工大学高层次引进人才科研启动基金(2023yjrc76) （2023yjrc76）
安徽省高等学校科学研究项目(2022AH052853) （2022AH052853）
国家自然科学基金项目(51778004) （51778004）
