In order to solve the problem that the designer′s
understanding of the building boundary of the opencut/shed
tunnel and the subgrade, comparative analysis of the crosssectional composition of the tunnel building boundary and the
highway building boundary are conducted. According to the functional requirements
of the same width in the specification, it is inferred that the independently
set highway opencut/shed tunnel building boundary and
the subgrade width should be understood as the sum of the width of the roadway
and the lateral width of the two sides, and the same width standard should
adopt the larger values of the highway building boundary (general value) and
the tunnel building boundary (lane + lateral width). Due to the need of laying
maintenance roads or sidewalks in the tunnel, the basic width of the building
boundary of the independent opencut/shed tunnel will
be equal to or greater than the width of the highway subgrade when meeting the
abovementioned requirements for the same width,
resulting in the problem that the structure of the opencut/shed tunnel exceeds the width of the subgrade. To address this
problem, the function of the maintenance lanes or sidewalk is analyzed, and the
analysis results show that the independent opencut/shed
tunnel can set the sidewalk on the outside of the structure, so as to
effectively reduce the structural span of the tunnel, improve the internal
force of the top beam, and facilitate the layout and construction of the
structural foundation.
WANG Xibao, YUAN Song, WEI Jicheng, ZHANG Sheng
. Determination and Flexible Application of Building Boundary of Opencut/Shed Tunnels of Highway[J]. Tunnel Construction, 2021
, 41(S2)
: 408
-412
.
DOI: 10.3973/j.issn.2096-4498.2021.S2.052
