In order to discuss the possibility of integral
pouring of the inverted arch and its filling, and solve the dispute between
separate pouring and integral pouring of the inverted arch and its filling.
Loadstructure model is established by numerical calculation to analyze
different effects of inverted arch filled at different pouring time on stress
performance of lining structure under three situations for filling body, i.e.
without central drain (pipe), with central pipe and with central drain. The
main conclusions are as follows. (1) When the filling of inverted arch is
without central pipe (ditch),the integral pouring of inverted arch and its
filling has no effect on the stress performance of lining structure.(2) When
the filling of inverted arch is with central pipe, the integral pouring of
inverted arch and its filling have less effect on the stress performance of
lining structure; whereas the stress is greater at the center of filling surface,
exceeding seven times greater as which in working condition of separate
pouring. Moreover, the thickness of filling body at upper part of central pipe
is small, which is unfavorable to tensile strength and prone to crack and
damage, thus inverted arch and its filling should not be poured integrally. (3)
When the filling of inverted arch is provided with central drain, the integral
pouring of inverted arch and its filling is adverse to the overall stress of
lining structure, which is not recommended.
QING Weichen, ZHONG Changgui, ZENG Hongfei
. Discussion on Inverted Arch and Its Filling by
Separate Pouring or Integral Pouring in Railway
Tunnel[J]. Tunnel Construction, 2021
, 41(S1)
: 63
.
DOI: 10.3973/j.issn.2096-4498.2021.S1.008
