In order to verify the safety of segment structure of
large crosssection shield tunnel under high water pressure, 5 control crosssections of Sutong GIL utility tunnel project are selected as the
research object to carry out prototype loading test on the segment structure by
multifunctional shield tunnel structure loading
device. Based on the theory of eccentric compression ultimate bearing capacity
of concrete structure, MN bearing capacity curve of segment structure is derived, and safety
evaluation index of segment structure is put forward. The research results show
that: (1) The bending moment of the segment structure shows a butterflyshaped distribution, and the axial force shows a circularshaped distribution; the maximum positive bending moment and the
maximum axial force appear on the crown. (2) The test internal forces of the
segment structure of selected 5 control crosssections
are all within the envelope of the bearing capacity curve, which is in a safe
state. (3) The safety coefficient of the segment structure is unevenly
distributed along the circumference; the safety coefficient of crown is smaller
than other positions; the safety coefficient of segment structure ranges from
2.12 to 2.9, which meets safety requirements.
SU Ang
,
FENG Kun
,
WANG Ninghua
,
ZHANG Xiaoyang
,
TU Xinbin
,
HE Chuan
,
QIAN Yuhua
,
LIANG Kun
. Safety Evaluation of Shield Tunnel Segment Structure
of Sutong GIL Utility Tunnel Project[J]. Tunnel Construction, 2020
, 40(9)
: 1314
-1323
.
DOI: 10.3973/j.issn.2096-4498.2020.09.010
