In view of the collapse and rockfall disaster occurred
in the K279 section of the EmeiPanzhihua section of the ChengduKunming railway, the Rockfall software is employed to analyze the
rockfall trajectory and impact kinetic energy and assess the damage degree of
rockfall to the railway. Furthermore, based on the calculation results of
impact kinetic energy, the setting range of the slope curtain protection net
and the setting of the passive net and other protective measures are
determined, and the extension range of the opencut
tunnel is determined based on the impact range of falling rocks. For the
extension of the opencut tunnel, an innovative
proposal that use the castinplace
inner and outer walls of the opencut tunnel and the
prefabricated assembly of the opencut tunnel arch ring
when adding an opencut tunnel during railway operation
is proposed based on the onsite terrain. Finally, the
design and construction of the castinplace inner and outer walls of the opencut
tunnel and the prefabricated assembly plan of the opencut
tunnel arch ring are introduced. According to the final rectification effect,
the use of prefabricated and assembled opencut tunnel
structures can safely and quickly add opencut tunnel
structures to existing lines.
SHANG Hanchun, LIU Ke, LI Yajun, LIU Xiongwei
.
Application of Prefabricated and Assembled Open-Cut
Tunnel Structure in Collapse and
Rockfall Control of Chengdu-Kunming Railway K279 Section
[J]. Tunnel Construction, 2023
, 43(S1)
: 330
-336
.
DOI: 10.3973/j.issn.2096-4498.2023.S1.038
