To deal with the mud and water gushing disaster in
Neogene waterrich semidiagenesis of fine sand in
Wangjiazhai tunnel of LinxiangQingshuihe highway, the
occurrence and mechanism of the mud and water gushing disaster are analyzed,
the construction treatment schemes such as advance tight pipe shed, horizontal
highpressure jetgrouting
pile, and curtain grouting, and the advantages and disadvantages of drainage in
the tunnel and surface dewatering by deep well are comparatively analyzed.
Additionally, numerous field tests are conducted on the Wangjiazhai tunnel, a
disaster prevention scheme of "prioritized geology, dewatering first,
short footage, strong advance support, auxiliary grouting, fast ring forming,
and multiple measurement" is established, and key construction techniques
of "surface deep well dewatering, comprehensive drainage in tunnel, tight
pipe shed, tight small conduit, surrounding 〖JP2〗grouting reinforcement, fourbench fivestep staggered excavation method, and rapid emergency response"
are summarized. Site practice shows that the average monthly footage has
gradually increased to 36.5 m, making a significant increase of about 16 times
the average monthly footage of 2.1 m in 2021, which has essentially addressed
the problem of mud and water gushing disaster in Wangjiazhai tunnel and ensured
the rapid and successful excavation of the tunnel.
XU Jinsong, LI Guofeng, WANG Qiuyi, LI Baohua, XU Hua, LI Ping
. Construction Techniques for Mud and Water Gushing
Section of Neogene WaterRich
SemiDiagenesis of Fine Sand in Wangjiazhai Tunnel[J]. Tunnel Construction, 2023
, 43(S1)
: 514
-521
.
DOI: 10.3973/j.issn.2096-4498.2023.S1.061
