In order to study the influence of metro shield
undercrossing tunneling on the deformation of doubleOtube （DOT） metro
tunnel, the characteristics of the deformation of the DOT tunnel during
Shanghai Metro Line No. 14 crossing underneath DOT tunnel on Line No. 6 twice
are analyzed by insitu measurement. The results show
that: (1) The shield undercrossing causes the vertical uplift deformation of
the DOT tunnel and the torsional deformation of the crosssection, and it is difficult to control the track deformation caused
by the crosssection torsion deformation. (2) The
vertical deformation of the DOT tunnel is uplift deformation, the tunnel
deformation is closely related to the incision position, and the curve near the
intersection shows a humpshape after undercrossing.
(3) The secondary crossing disturbance and superposition effect are
significant, which are manifested as the extension of tunnel uplift deformation
time, the increase of the accumulated deformation, and the change of the
maximum deformation position during the two undercrossing processes. (4) The
torsional deformation of DOT tunnel shows a wavy dynamic change distribution
with the location of the shield tunnel incision, and there are multiple turning
points, 〖JP2〗which is
disadvantageous to the stress and deformation of the tunnel segment joint.
Besides, the torsional deformation of the second undercrossing is smaller than
that of the first undercrossing. (5) The time that the most unfavorable crosssection torsion of the DOT tunnel appears is different from that of
the maximum deformation of the tunnel, and the most disadvantageous torsional
position and the position where the maximum tunnel uplift occurs locate in
different areas. (6) The grouting at the shield tail is effective in
controlling the deformation of the DOT tunnel, but it leads to the increase of
the torsional deformation of the tunnel.
LIU Yingbin
,
LIAO Shaoming
,
CHEN Lisheng
,
LIU Yiqiang
,
GU Yingcheng
. Deformation Law of Shield Tunneling underneath an
Adjacent DOT Metro Tunnel in Soft Ground[J]. Tunnel Construction, 2020
, 40(10)
: 1462
-1470
.
DOI: 10.3973/j.issn.2096-4498.2020.10.010
