The rectangular pipejacking
tunnel has obvious advantages in the development and utilization of urban
underground space. However, with the increase of crosssection
of rectangular pipejacking tunnel, the design
difficulty and construction risk increase. By taking the vehicle pipe jacking
tunnel project of Hongzhuan Road undercrossing Zhongzhou Avenue in Zhengzhou
for example, the numerical simulation and theoretical analysis are adopted to
study the determination method of the key contents of rectangular pipejacking tunnel such as soil cover thickness and structure size in
the design. And the scheme of segment design and the design of joint and
longitudinal connection are introduced. The research results show that: (1)
When the thickness of the overburden is not less than 4 m, the settlement
deformation tends to be stable, the maximum settlement is 28 mm and the
settlement value is controllable within safe range. (2) After the preliminary
formulation of the crosssection form, the size of the
structure should be determined through the structural calculation, and its
rationality should be verified through calculation in construction and
operation stages; the analytical results show that it is rational and feasible
to initially determine the structural thickness of 600 mm, and there is no
optimization space. (3) The convenience and operability of the project
construction should be fully considered while ensuring project safety, and the
targeted designs for prefabrication scheme of the segment, segment joint and
longitudinal connection should be carried out.
HUANG Wei
. Optimization Design of Segmental Structure of Large
Crosssection Rectangular Pipe jacking Tunnel[J]. Tunnel Construction, 2020
, 40(6)
: 859
-867
.
DOI: 10.3973/j.issn.2096-4498.2020.06.011
