Abstract：
Aiming at the serious effect of soil and water loss on tunnel operation and safety, full-scale quasi-static loading tests were conducted regarding the ultimate bearing capacity of staggered erected tunnel linings in unloading situation. The design of tested lining and loading schemes were introduced. The test results, including the evolution of deformation, segment crack, joint opening and bolt stress, were presented. The bearing capacity and failure mechanism of tested linings were discussed and analyzed. It shows load-displacement curve is of elastic-plastic form and the tendency of load-displacement curve is linearly rising; strength failure of circumferential joint occurs and the interaction between segments decreases, leading to decrease of integral rigidity; shearing failure of concaveconvex connector of circumferential segment joint, compression induced concrete failure of longitudinal joint and bending failure of the segment finally cause stability loss of the tunnel structure.
2018, Vol. 55 