To study the
shear stiffness characteristics of rectangular pipe jacking Ftype
socket joint, a refined threedimensional finite
element model is established. By analyzing the mechanical characteristics of
joint members under different shear displacements, the shear stiffness of joint
and the factors influencing the shear stiffness are studied. The results show
the following: (1) The shear stiffness of Ftype socket
joint in rectangular pipe jacking tunnel is nonlinear, which can be divided
into three stages, i.e.〖KG-*3〗,
when the dislocation amount is less than 7.6 mm, the shear stiffness of the
joint is basically unchanged; when that is 7.6 ~ 22.29 mm, the shear stiffness
of the joint is reduced to 30%; and when that is more than 22.29 mm, the joint
reaches yield load, and the shear stiffness of the joint is basically 0. (2)
First, the shear failure occurs to the steel collar of joint inverted triangle
area, then compressive failure occurs to the concrete of joint inverted
triangle area, and finally a failure surface is formed. The steel collar and
concrete of joint inverted triangle area bear most of the shear force when
joint dislocates, which is prone to failure and should be strengthened. (3) The
shear stiffness increases with an increase in thickness and length of steel
collar, chamfer radius, coefficient of foundation bed, and wall thickness, and
the wall thickness has a most significant effect on joint stiffness.
XU Youjun, DONG Wenxiu, PEI Xuejun
. Shear Stiffness and Influencing Factors of FType
Socket Joint of Rectangular Pipe Jacking[J]. Tunnel Construction, 2021
, 41(S2)
: 84
-91
.
DOI: 10.3973/j.issn.2096-4498.2021.S2.010
