Abstract：The assembly types of lining segments are generally categorized into the straight joint assembly and the staggered joint assembly. The differences in lining structure caused by assembly type may lead to distinct discrepancies in the mechanical behaviors and failure modes of structure under the same loading conditions. With Shiziyang shield tunnel project taken as an example and based on the similarity model test method, the comparative analysis on mechanical properties and failure modes of lining segments with different assembly types was conducted. The results show that the assembly type has significant influences on the mechanical properties and failure modes of lining structure. The rigidity of lining structure with straight joint assembly is smaller than that with staggered joint assembly. The lining structure with straight joint assembly has the lower ultimate bearing capacity and larger critical displacement when the critical failure state of structure is approached. Meanwhile, once the macroscopic failure of lining structure occurs, it quickly goes into the unstable phase, characterized by the sudden loss of bearing capacity of the structure and the most serious damage and failure of lining structure. The ultimate bearing capacity of lining structure can be increased by the staggered joint assembly. The entire process from local macro-crack to the overall failure of structure is relatively long and characterized by the remarkable progressive. Particularly, with the staggered joint assembly type, the bearing capacity of CF2 is largest before its failure and its displacement at critical failure state is smallest.
王士民 申兴柱 何祥凡 姚佳兵. 不同拼装方式下盾构隧道管片衬砌受力与破坏模式模型试验研究[J]. 土木工程学报, 2017, 50(6): 114-124.
Wang Shimin Shen Xingzhu He Xiangfan Yao Jiabing. A model test for the mechanical property and failure mode of lining segments with different assembly types of shield tunnel. 土木工程学报, 2017, 50(6): 114-124.
