The ground in Beijing area is mainly composed of waterrich
weak soils containing fine sand, silty clay, and silty fine sand. The ground
reinforcement cannot be applied to #5 and #6 connection galleries of BeijingShenyang highspeed railway shield tunnel because
of buildings on the ground. Hence, to avoid the collapse damage of ground
buildings induced by the strata settlement during prereinforcement
process, the water and sand gushing due to poor reinforcement effect, and
tunnel face collapse, the metro jet system(MJS) method is adopted to
consolidate the strata with superhigh pressure
horizontal jet grout piles, resulting in good reinforcement effect, which can
improve the selfstability and confined water isolating
effect of soils and reduce the influence of strata reinforcement and excavation
on the settlement of ground buildings to the maximum extent. The results show
that the maximum uplift of ground is 0.93 mm, the maximum settlement is -2.85
mm after excavation and lining completion, which meets relevant requirements
and guarantees the building safety. The results indicate the prominent ground
reinforcement effect of horizontal jet grouting pile by MJS method in waterrich clay, silty clay, and silty fine sand strata in urban areas,
which can achieve good social and economical benefits.
ZHAI Zhiguo, HUA Nan, LIU Liu
.
Application of Metro Jet System Horizontal Jet
Grouting Pile in Connection Gallery
of BeijingShenyang HighSpeed Railway Shield Tunnel
[J]. Tunnel Construction, 2021
, 41(S2)
: 512
-519
.
DOI: 10.3973/j.issn.2096-4498.2021.S2.065
