Herein, to investigate the characteristics of
dewatering, excavationinduced deformation, and groundwater
variation in an ultrawide pitinpit in the Binhai avenue renovation project in Shenzhen, China,
deflection of retaining structures, settlement of surfaces and surrounding
structures, and correlation between groundwater and tidal water are analyzed
using a field monitoring method. Moreover, a threedimensional
fluidsolid coupling model is established considering
tidal water replenishment using the ABAQUS finite element software to explore
the development characteristics of underground diaphragm wall deflections
during dewatering and excavation processes. The model validates the control
effect of the staged dewatering control method and steel bracing change scheme
on wall deformation. The following conclusions are drawn: (1) During the
excavation process, the maximum wall deflection is 29.5 mm and the north and
south wall tops move outward. Further, the maximum surface settlement is 29.4
mm, and the vertical displacements of columns and surrounding structures are
<6.5 mm. (2) Tidal water replenishment and rainfall lead to a water level
drop of approximately 〖WTBZ〗-〖WT５《TNR》〗1.0 m in
the north and 〖WTBZ〗-〖WT５《TNR》〗1.5 m in
the south outside of the pit. (3) During the dewatering and excavation phases,
the staged dewatering control method and steel bracing change scheme reduce the
maximum wall deflection by ~29% and 21%, respectively.
HAN Hui
,
WANG Ruisong
,
NI Pengpeng
. Dewatering and Excavation Response of an UltraWide
PitinPit in Binhai Avenue Renovation Project in Shenzhen, China[J]. Tunnel Construction, 2023
, 43(12)
: 2026
-2035
.
DOI: 10.3973/j.issn.2096-4498.2023.12.005
