Crack evolution law of shield tunnel lining and its simplified simulation method
WANG Feiyang1，2，HUANG Hongwei1，2
(1. Key Laboratory of Geotechnical and Underground Engineering，Ministry of Education，Tongji University，Shanghai 200092，China；2. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China)
Abstract：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.
王飞阳1，2，黄宏伟1，2. 盾构隧道衬砌结构裂缝演化规律及其简化模拟方法[J]. 岩石力学与工程学报, 2020, 39(S1): 2902-2910.
WANG Feiyang1，2，HUANG Hongwei1，2. Crack evolution law of shield tunnel lining and its simplified simulation method. , 2020, 39(S1): 2902-2910.
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2020, Vol. 39 
