The degradation of macro-mechanical properties of shield tunnel segments

摘要

In this paper, the degradation of mechanical properties for eccentrically compressed members was investigated by testing the bearing capacities under the combined effect of load, water permeation and salt environment of chloride and sulfate. The results showed that: (1) the bearing capacity of eccentric compression members under "Seepage stress field" increased with the increase of time; (2) when suffering the combined action of chloride and sulfate, the bearing capacity of eccentric compression members under "Seepage stress field" increased in the early stage of corrosion. However, the bearing capacity decreased afterwards. The higher the ions concentration, the greater the descent; (3) the greater the eccentricity, the greater the vertical displacement of eccentric compression members and the smaller the ultimate bearing capacity.