In:
Thermal Science, National Library of Serbia, , No. 00 ( 2023), p. 122-122
Abstract:
Cold regional tunnels have been encountering numerous frost damages as a
result of dynamic changes in hydrothermal conditions of tunnel structural
layers. The climate change is recognized as a major contributor for the
problems. In this study, the hydrothermal conditions of a high-speed railway
tunnel are evaluated under different climate scenarios based on in-situ data
and numerical analysis. Subsequently, the effect of different thicknesses of
insulation board on hydrothermal conditions inside the tunnel is compared
and the reasonable thickness is obtained. The main findings are as follows:
1) the temperature and unfrozen water content gradually decreased and the
ice content gradually increased with the service time of the tunnel in the
early 15 years. The maximum frozen depth occurs at the tunnel sidewall and
it with a depth of 1.64 m within 30 years after the construction. 2) The
hydrothermal conditions inside the tunnel are significantly affected by
annual mean air temperature (AMAT) and annual range of air temperature
(ARAT). The maximum frozen depth decreases with AMAT, but increases with
ARAT. 3) After the XPS board with a thickness of 5 cm is laid in tunnel
structural layers, the temperature at the most unfavorable position is 0.55
?C in the cold season, which suggests that frost damages disappeared and
this method can be used to protect the tunnel against the frost damages.
This paper can provide a basis for heat insulation design of the cold
regional tunnels.
Type of Medium:
Online Resource
ISSN:
0354-9836
,
2334-7163
DOI:
10.2298/TSCI230122122J
Language:
English
Publisher:
National Library of Serbia
Publication Date:
2023
detail.hit.zdb_id:
2241319-4
