In this study,
the development history of tunnel rehabilitation and expansion in China over
the last 20 years is investigated. Furthermore, the cases of additional
tunnels, insitu expansion tunnels, combined expansion tunnels, and
rehabilitated tunnels are summarized, and the development status of the
research magnets, including rehabilitation and expansion modes, construction
methods, construction mechanical responses, support parameters design and
optimization as well as safety control of tunnels are examined, and their
corresponding shortcomings are proposed. The specifications are as follows:
first, the evaluation indices of various projects differ in terms of
rehabilitation and expansion modes, and there is no standard guideline. Second,
the design is more conservative in terms of construction methods, and it is
critical to research how to realize efficient construction based on the
existing tunnel lining. Third, in terms of the construction mechanical
responses and support parameters, the field monitoring, calculation, and
numerical simulation results of several projects vary, and there is no study on
the development laws of surrounding rocks′ deformation,
stress, and plastic zone under complex dynamic loading condition, which shows
that more project applications should be studied, and an analysis system should
be established for support parameters optimization. Fourth, in terms of the
construction safety control, considerations should be made for blasting
vibration reduction, support layout optimization, local reinforcement of weak
surrounding rock, and construction auxiliary measures as well as the
development of a quantitative index system for evaluating risk sources.
Finally, the tunnel rehabilitation and expansion project′s development directions of standardized design, information
management, green construction, and rapid construction are prospected.
ZHANG Zaichen
,
LIN Congmou
,
LI Jiasheng
,
DONG Yi
,
SHEN Yawen
. Development Status and Prospect of Highway Tunnel
Rehabilitation and Expansion in China[J]. Tunnel Construction, 2022
, 42(4)
: 570
-585
.
DOI: 10.3973/j.issn.2096-4498.2022.04.005
