The primary support structure of the tunnel would be
damaged due to soft rock deformation under high ground stress. Therefore, the
yielding technology of surrounding rock is investigated and the yielding joint
to relieve support displacement and reduce surrounding rock pressure is proposed.
The influence of bolt preload and groove shape on the working performance of
yielding joint is analyzed based on finite element simulation and a 1∶1
prototype joint axial loading test. The analytical results show the following.
First, the joint deformation pressure can be released according to setting
mode, and the resistance to deformation is stable. Second, the preload and
groove shape significantly affect yielding joint; the greater the preload and
the narrower the groove, the higher the sliding resistance. Finally, the type
of diameter shrinkage groove consumes huge energy, with a high safety reserve.
Therefore, the yielding joint can release surrounding rock energy and provide
stable resistance during the working process.
DONG Biao
,
YANG Jinjing
,
YIN Hongbo
,
XU Guolin
. Yielding Performance of Tunnel Steel Arch Joints[J]. Tunnel Construction, 2021
, 41(9)
: 1524
-1529
.
DOI: 10.3973/j.issn.2096-4498.2021.09.011
