A series of full-scale loading tests are performed for a prospective subway tunnel with a rectangular
shape including two reliability tests: one stagger-jointed three-ring reliability test, and one ultimate failure test on
a single ring. Comprehensive measuring programs are designed to record the deformation of both lining structure
and joints and the stresses of concrete, bolts and reinforcements. Experimental results show that in both the
single-ring and three-ring loading cases, the long sides of tunnel cross section bend inwards while the short sides
of tunnel cross section bend outwards. The inner part of joints opens while the outer part of joints closes at places
experiencing positive moment and vice versa. Joint’s rotational stiffness varies at different locations. Concrete
cracking and crushing are the chief damage modes, and they are closely related to the distribution of bending
moment. Stagger-jointed fabrication significantly increases the overall rigidity of lining system, which thereby
greatly reduces the deformation of both concrete lining and joints in comparison with the single-ring case. It is
shown that the routinely-used uniform rigidity model is conservative and the preliminary design can be optimized
by applying an effective rigidity ratio (ERR) of 0.5.
ZHU Yeting (朱叶艇), ZHANG Zixin (张子新), HUANG Xin (黄昕), ZHANG Guanjun (张冠军)
. Prototype Loading Tests on Full-Ring Segmental Lining of Rectangular Shield Tunnel[J]. Journal of Shanghai Jiaotong University(Science), 2018
, 23(6)
: 746
-757
.
DOI: 10.1007/s12204-018-1979-9
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