In order to study the influence of the lateral
pressure coefficient on the deformation and stress characteristic of the shield
tunnel joint, a threedimensional refined numerical model
is developed, and the fullscale test is carried out.
The sensitivity of the lateral pressure coefficient to the joint open,
dislocation and the bolt stress under the conditions of normal load, overload
and unload is studied. The study results show that: (1) At the normal load
stage, the reduction of the lateral pressure coefficient worsens the load form
of the tunnel structure, thus the joint is prone to damage easier. (2) When the
lateral pressure coefficient decreases from 0.7 to 0.65 and 0.6, the maximum
open of longitudinal joint increases by 1.6 times and 21.7 times respectively,
and the maximum dislocation of circumferential joint increases by 2.7 times and 20.1 times respectively. (3)
The longitudinal joint open and circumferential joint dislocation under unload
condition is more sensitive to the variation of lateral pressure coefficient
than overload condition. At the stages of "critical instability " and
"ultimate failure", the bolt stresses are basically the same under
different lateral pressure coefficients, which shows that the bolt stress is
mainly determined by its own properties, the reduction of lateral pressure
coefficient only accelerates the process of bolt yield, while has no
significant influence on the final stress of the bolt.
ZHANG Bolin, ZHENG Jun
.
Study on Influence of Lateral Pressure Coefficient on Deformation
and Stress of Shield Tunnel Joints
[J]. Tunnel Construction, 2020
, 40(S1)
: 39
-50
.
DOI: 10.3973/j.issn.2096-4498.2020.S1.006
