The mud gushing and large deformation occurred to
Laohongpo tunnel of DaliRuili railway when crossing contact
zone between soluble rock and nonsoluble rock.
According, the deformation, cracking and geological causes are analyzed, the
mud gushing scope in main tunnel is explored by using bypass heading, the
working chamber in tunnel is enlarged, treatment method of advanced horizontal
grouting + highpressure horizontal jet grouting pile
and advanced horizontal large pipe roof is adopted, and the support and lining
structure are adjusted and strengthened. According to the site working
conditions, the threebench method is adopted to
separate and replace the steel frame in sections. The temporary invert or
temporary cross brace is added at the arch foot of the steel frame to control
the convergence deformation. The grid steel frame formwork lining is
constructed in time, and the permanent secondary lining is constructed after
the deformation becomes stable. The technology mentioned has been successfully
applied to the construction practice in Laohongpo tunnel of DaliRuili railway, and good results have been achieved.
YANG Hua
,
XU Jiqi
,
YAN You
. Treatment Technology for Mud Gushing from One Side of
Laohongpo Tunnel Crossing Contact Zone of DaliRuili
Railway[J]. Tunnel Construction, 2020
, 40(S2)
: 241
-248
.
DOI: 10.3973/j.issn.2096-4498.2020.S2.031
