摘要
裂缝是盾构隧道衬砌结构的主要病害之一,裂缝的存在严重地影响着衬砌结构的服役性能。为了研究盾构隧道衬砌结构裂缝的演化机制,结合衬砌管片的偏心加载试验,采用多尺度模型模拟了偏心加载过程中衬砌管片裂缝的演化,并对试验和多尺度模型得到的裂缝演化过程进行了对比分析。分析表明:随着加载,裂缝经历了从无到Ⅰ型裂缝的扩展,Ⅰ型裂缝主要沿着径向扩展,最后到Y型裂缝出现;开裂后的混凝土表现为环向径向横观各向同性,衬砌管片力学性能随着裂缝的演化逐渐退化,其退化主要是在环向方向,并且与裂缝特征及其空间位置有关。以此为基础,通过ABAQUS子程序USDFLD来实现衬砌管片环向力学参数随裂缝深度及其空间位置的变化,并将计算结果与多尺度模拟结果进行对比,结果表明提出的简化模拟方法能够简便准确地考虑裂缝演化对衬砌结构力学性能的影响。
Crack is one of the main defects which have significant effects on service performance of the shield tunnel lining. In order to reveal the crack evolution mechanism of the shield tunnel lining,a multiscale model is proposed to simulate the crack evolution of the lining segment test under eccentric loading. And contrast analysis is carried out between the results obtained by eccentric loading test and those by the multiscale model. The results show that the segment experiences from non-damage to Ⅰ-type cracks in which the cracks mainly propagate along the radial direction,and to Y-type crack with loading. Meanwhile,the cracked concrete under eccentric load can be regarded as transverse isotropy material in radial and circular directions. The deterioration of mechanical properties mainly happens in circular direction and is related to the evolution of cracks and the spatial location. According to this characteristic,ABAQUS subroutine USDFLD is used to realize a simplified simulation method by considering mechanical properties in circular as field variables related to the crack depth and its spatial location. The proposed method can simply and accurately consider the influence of cracks according to the comparison of the results obtained by the simplified simulation method and the multiscale model.
作者
王飞阳
黄宏伟
WANG Feiyang;HUANG Hongwei(Key Laboratory of Geotechnical and Underground Engineering,Ministry of Education,Tongji University,Shanghai 200092,China;Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2020年第S01期2902-2910,共9页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51778474)。
关键词
隧道工程
裂缝演化
黏结界面单元
多尺度模型
盾构隧道衬砌
横观各向同性
tunnelling engineering
crack evolution
cohesive interface element
multiscale model
shield tunnel lining
transverse isotropy
