The insufficient lining thickness often causes crack
or damage to doublearch tunnel structure and further
threatens the tunnel safety. Thus, the surrounding rock pressure
characteristics, distribution laws of lining internal force and crack of tunnel
structure under condition of insufficient lining thickness of doublearch tunnels with monolithiclined central
walls are studied by similarity model test. The study results show that: (1)
The maximum bending moment is located in the bottom of the middle wall, and
cracks and crushing occur on the outer and inner face of middle wall corner
with the most serious crack damage, which is the most unfavorable position. (2)
The lining border with insufficient thickness is the weak zone, cracks would
occur to lining inner face of right edge when the lining thickness of left arch
shoulder of left line is insufficient, and those would occur to lining outer
face of upper edge when the lining thickness of left arch shoulder of left line
is insufficient. (3) Large tensile stress occurs to the connecting area between
middle wall top and haunch, the variation of locations of insufficient lining
thickness area would affect the stress state of the lining on the middle wall
top, and the crack on the upper right corner of the middle wall, which is the
key area of the lining failure, appears later than that at the crown on the
opposite side of the lining with insufficient thickness.
ZHANG Xu
,
CHENG He
,
XU Youjun
,
MIN Bo
,
YE Zijian
. Influence of Insufficient Lining Thickness on
Structural Safety of Doublearch
Tunnel[J]. Tunnel Construction, 2020
, 40(11)
: 1586
-1593
.
DOI: 10.3973/j.issn.2096-4498.2020.11.006
