The secondary
lining structures designed by existing loadstructure methods often exist
with large covering thickness, low economic efficiency, and poor construction
operability problems. Therefore, based on the global and local stability
characteristics of a giant cavern with a span of greater than 50 m, the
mechanism of a giantspan cavern secondary lining
structure undertaking residual deformation and an unstable block load is
proposed, and the calculation process of secondary lining structure design is
demonstrated. The results indicate the following: (1) The mechanical model of
the giantspan cavern secondary lining structure
bearing residual deformation and unstable block load conforms to the global and
local stability mechanism of the giantspan cavern. (2)
The residual deformation of the cavern is the difference between the ultimate
and existing settlements; the results obtained using the proposed method are
highly consistent with the contact pressure of the secondary lining and
shotcrete. (3) The proposed unstable block load is designed for the weak part
of the cavern with high safety. (4) The secondary lining structure thicknesses
of the arch and sidewall obtained using the designed method are 0.8 and 1.4 m,
respectively, which are 27%~53% lower than those of the conventional design
method.
SONG Chaoye
,
LYU Shuqing
,
HE Weiguo
. Design of Secondary Lining Structure of a GiantSpan
Cavern[J]. Tunnel Construction, 2022
, 42(9)
: 1589
-1596
.
DOI: 10.3973/j.issn.2096-4498.2022.09.010
