To examine the influence of
the cross-sectional shape, cavern
spacing, and buried depth of the underground water-sealed
cavern on the stability of the surrounding rock of the cavern, feasible rock
stability discrimination indicators are established based on the mechanical
meaning of the Mohr-Coulomb failure criterion. Then,
finite element simulation software is used to study the rock stability under
various working conditions, with rock safety factor, deformation, and stress as
primary discrimination indicators. The research results reveal the following:
(1) In the simulated single cavern working condition, the horizontal
displacement of the straight wall shaped cavity is slightly smaller than that
of the curved wall circular arch shaped cavity, and the straight wall shaped
cavity is slightly larger than that of the curved wall shaped cavity. The
stress distribution of the curved wall shaped cavity is relatively uniform,
which is more conducive to the stability of the surrounding rock. (2) The
stability of the surrounding rock in the main cavern of the underground water
sealed cavern varies, with the stability of the surrounding rock at the bottom
of the cavern being better, followed by that at the top, and that on both sides
of the cavern being poorer. (3) The increase in the spacing between adjacent
caverns leads to an increase in the stability of the surrounding rock, but the
improvement effect is no longer significant when the spacing of the tunnel is
doubled tunnel span. (4) In the underground cavern group, the vertical
displacement of the central cavern is significantly higher than that of the
edge cavern; and the horizontal displacement of the left and right sidewalls in
the edge cavern differ significantly. (5) As the burial depth of the cavern
increases, the stability of the surrounding rock around the cavern decreases.
When the burial depth of the cavern is over 150 m, reinforcement measures for
the surrounding rock should be implemented to ensure the stability of the
cavern.
ZHU Jie
,
YANG Chen
,
CUI Meng
,
FU Yueyou
,
JIA Hongyan
,
HAN Mengmeng
. Surrounding Rock Stability
of Main Caverns of Underground Water-Sealed Cavern Based on Safety Factor[J]. Tunnel Construction, 2024
, 44(S2)
: 179
-191
.
DOI: 10.3973/j.issn.2096-4498.2024.S2.019
