Analysis of mechanical characteristic of shield tunnel segments lining and its influence during construction

The mechanical characteristic of shield tunnel segments lining and its influence during construction are analyzed. Firstly, the construction loads are divided into jack thrust force, grouting force, buoyancy, shield shell press, installation load, and other loads, etc. Then, the mechanical characteristic of shield tunnel segments lining is summarized as the typical three-dimensional character, indetermination, and the innegligible character. Afterwards, the influence of the construction loads on segments lining is discussed, including the cracks, partial breakage, sealing strip falling, segments leakage, and segments dislocation. Finally, some advices to protect the shield segments during construction are presented, such as jack controlling, grouting pressure controlling, and the repeated tightening the bolts. The result shows that the analysis of the mechanical characteristic of shield tunnel segments lining and Its influence during construction is imperative, and the construction loads should be emphasized in segments designing and the correlative criferia.