Four largediameter slurry shields should
be received in an ultradeep shaft in waterrich and weak strata (clay, silt, and siltyfine
sand). Consequently, Ushaped plain diaphragm wall +
ultradeep triaxial mixing pile + Rodin jet pile ultrahigh pressure jet grouting is used to consolidate the ground, and
the dewatering well is adopted to improve the overall stability and waterstop effect of end soil of the receiving shaft and realize fast
shield receiving. Further, the gyroscope orientation and cast point hole for
penetration measurement are adopted to ensure the accuracy of shield receiving
and provide a basis for fast and precise positioning and installation of the
receiving base. Hydraulic drilling and wiresaw cutting
are used to break the concrete door of Wangjing tunnel, which significantly
improves the door breaking efficiency. The steel ring of the tunnel is
installed with double wire brushes as the sealing of the receiving tunnel,
which prevents sand and water from gushing effectively when the door is broken,
ensures the safety of shield receiving, reduces the installation and removal of
the last ring segment, and further rapids the shield receiving. By adopting the
abovementioned key techniques and scientifically
organizing and coordinating the receiving and dismantling sequence of the four
shields, the fast receiving of the four largediameter
shields used in Wangjing tunnel of BeijingShenyang
railway is realized.
ZHAI Zhiguo
,
HUA Nan
,
LIU Liu
. Fast Receiving Technology for Multiple LargeDiameter
Slurry Shields in UltraDeep
Shaft in WaterRich and Weak Strata: A Case Study on Wangjing Tunnel of BeijingShenyang Railway[J]. Tunnel Construction, 2021
, 41(2)
: 283
-292
.
DOI: 10.3973/j.issn.2096-4498.2021.02.015
