Abstract The mechanical characteristics of a staggered jointed specially shaped segmental lining under the proto? type loading test with an increasing buried depth were analyzed based on the modified routine method and shellspring model. The results show that the overall deformation of the specially shaped shield lining is just like a“lying duck egg”; the existence of the circumferential joints leads to an asymmetric distribution of the internal force, and the internal force at the segment edge is larger than that in the segment center due to the shearing action of the longitudinal joints with a strengthened edge. The calculation results of the shell-spring model considering 3D space is larger than that of the plane strain-state based modified routine method that exaggerates the reinforcing action of the staggered jointed erection, which indicates the latter is safer for use as the design method for specially shaped segments. The suggested range for the transverse effective rigidity ratio is 0.72-0.87 and the moment transfer coefficient is 0.245-0.256 for the positive moment area and 0.166-0.197 for negative moment area.
Abstract：
The mechanical characteristics of a staggered jointed specially shaped segmental lining under the proto? type loading test with an increasing buried depth were analyzed based on the modified routine method and shellspring model. The results show that the overall deformation of the specially shaped shield lining is just like a“lying duck egg”; the existence of the circumferential joints leads to an asymmetric distribution of the internal force, and the internal force at the segment edge is larger than that in the segment center due to the shearing action of the longitudinal joints with a strengthened edge. The calculation results of the shell-spring model considering 3D space is larger than that of the plane strain-state based modified routine method that exaggerates the reinforcing action of the staggered jointed erection, which indicates the latter is safer for use as the design method for specially shaped segments. The suggested range for the transverse effective rigidity ratio is 0.72-0.87 and the moment transfer coefficient is 0.245-0.256 for the positive moment area and 0.166-0.197 for negative moment area.
.Mechanical Characteristics of the Segment Lining for a Large Specially Shaped Cross-Section Shield Tunnel in Clay Strata[J] MODERN TUNNELLING TECHNOLOGY, 2018,V55(4): 106-113
2018, Vol. 55 