Abstract：The hydraulic pressure has a significant influence on the stress state of shield tunnel segment lining structure and long-term safety. Based on Shiziyang shield tunnel project, using the model test method, a comparative analysis of internal force, deformation, acoustic emission data and crack development test data of segment lining structures under three different hydraulic conditions was made. The influence of hydraulic pressure on the mechanical behaviors and damage characteristics the lining structure of shield tunnel was discussed. The results show that the increase of hydraulic pressure in a certain range prolongs the elastic stress stage and the plastic development platform of the segment lining structure, delays the appearance of damage and failure and improves the ultimate load carrying capacity of the lining structure. With the increase of hydraulic pressure, the ratio of the maximum displacement of the critical buckling point to the outer radius of the tunnel increases from 2.33% to 2.77%, the process from the appearance of partial damage to the overall instability of segment lining structure becomes shorter and the pace of development becomes faster, the main failure mode of the segment changes from tension failure to compression shear failure.
王士民 姚佳兵 何祥凡 申兴柱. 水压对盾构管片衬砌力学特征与破坏形态的影响模型试验研究[J]. 土木工程学报, 2018, 51(4): 111-120.
Wang Shimin Yao Jiabing He Xiangfan Shen Xingzhu. Research on the mechanical property and failure mode of shield tunnels with different hydraulic pressure by model test. 土木工程学报, 2018, 51(4): 111-120.
