To effectively control the ground deformation induced
by shield tunneling in sandycobble strata, a case study is
conducted on the Beijing metro line 17 crossing above the existing SouthtoNorth water transfer tunnel project, and
the insitu monitoring and numerical simulation methods
are employed to examine the ground deformation control effect of tunneling
parameters, special new segment design, soil grouting prereinforcement, supplemental grouting reinforcement, and clay shock
products filling. The research results show the following: (1) The newlybuilt tunnel induces surface soil subsidence, as a result,
supplemental grouting should be conducted after the first tunnel passes to
avoid dramatic increasing in ground settlement induced by later tunnel
construction. (2) The horizontal deformation of deep soil decreases gradually
from top to bottom with increasing soil depth, and the surface soil deformation
is the largest. (3) Vertical lifting occurs to the lower existing water
transfer tunnel at the intersection of the two tunnels, and basically no
horizontal deformation occurs. (4) In sandycobble
strata, reasonable shield tunneling parameters and grouting reinforcement can
effectively reduce the impact of new shield tunneling on the existing tunnel
structure.
LIANG Mengchang
,
BAI Xuefeng
. Deformation Control Technology of Shield Tunneling
Above a Water Transfer Tunnel in SandyCobble Strata[J]. Tunnel Construction, 2022
, 42(S2)
: 458
-466
.
DOI: 10.3973/j.issn.2096-4498.2022.S2.057
