The primary support of singletrack
railway tunnels can be damaged owing to large deformations in soft rocks caused
by high geostress. An optimization strategy for the original straightplatetype supportresistant
limiting damper(SRLD) is presented and the mechanical properties of the
optimized SRLD under different optimization parameters are examined. To conduct
field tests on a restricted energydissipationtype primary support, the SRLD is applied to the singletrack section of the Shanenshan No. 2 tunnel of ChinaLaos railway. The results of the parameter test and the application
of the SRLD are analyzed as follows. (1) The direction of the curvedplate SRLD is controllable when the plate is compressed and
deformed, and the SRLD undergoes four stages: elastic deformation, yielddecline deformation, constantresistance
deformation, and compaction rise. (2) Changing the diametertoheight ratio of the vertical connecting
steel plate of the SRLD can change the initial peakpressure
value of the SRLD, affecting the constantresistance
value marginally. Therefore, in practice, the diametertoheight ratio of the vertical connecting steel plate of the SRLD must
be selected according to the initial peak value of 8 MPa. (3) After the SRLD is
used in the test section, the surrounding rock pressure is released to protect
the primary support structure from invasion and limit damage. Moreover, the
construction safety and economy can be guaranteed under the condition that
support parameters are not strengthened.
DAI Jun
,
WANG Jianjun
,
ZHOU Bo
,
QIU Wenge
,
LUO Jie
. Application of SupportResistant
Limiting Damper in SingleTrack Railway Tunnel[J]. Tunnel Construction, 2023
, 43(6)
: 980
-987
.
DOI: 10.3973/j.issn.2096-4498.2023.06.008
