To investigate the radial shear along the shear
direction of the circumferential joint in shield tunnels, a radial shear
stiffness calculation model based on concaveconvex tenons and diagonal
bolts is established. The development of radial shear along the shear direction
in the circumferential joint is analyzed in four stages: static friction, bolt
anchoring, bolt bending, and concaveconvex tenon
occlusion. The mechanical characteristics and main components of shear
stiffness of the circumferential joint in each stage are analyzed using an
analytical method. By comparing experimental data with theoretical model
results, it is found that: The differences in bolt assembly methods and
deformation mechanisms of the structure lead to differences between the
theoretical model and test results； During the
deformation stage, the results are similar, indicating that the calculation
model is capable of accurately describing the shear characteristics of the
circumferential joint in the shear process. The experimental data of the
loading test of the tenoned segment is compared with the theoretical model. The
results indicate that when the longitudinal force reaches 2 000 kN, the
experimental results of the shear stiffness of concaveconvex
tenon are close to the theoretical model calculation results, which indicates
that the theoretical model can accurately describe the mechanical behavior of
tenons in the process of shearing under the condition of large longitudinal
force.
ZHANG Di
,
XU Youjian
,
LIAO Shaoming
,
CHEN Ruijie
,
SUN Jiacheng
. Radial Shear Stiffness of Circumferential Joint Along
Shear Direction with ConcaveConvex
Tenon and Diagonal Bolt in Shield Tunnel[J]. Tunnel Construction, 2023
, 43(2)
: 228
-239
.
DOI: 10.3973/j.issn.2096-4498.2023.02.004
