During the rehabilitation of an existing metro
station, a series of problems occurred, such as the water and soil pressure
imbalance between the newlyadded semirange
station and the existing foundation pit, large width of the foundation pit
extended at both ends, and complex traffic diversion and reconstruction of
transfer node. Accordingly, a set of relatively perfect rehabilitation scheme
is formed through detailed comparison and analysis of foundation pits in each
section based on numerical analysis results considering various action
combinations and structural type transformation in construction process and
permanent use stage. The main conclusions are drawn as follows: (1) The
existing semirange of the foundation pit has been
excavated to the bottom, thus the new half should be constructed by the cutandcover topdown
method. (2) The extended foundation pit at both ends should be constructed by
the combination of open cut and cutandcover methods, and the anchor cable support that can be recycled
should be adopted. (3) The foundation pit at the transfer node should be
constructed by the cutandcover
topdown method. (4) The concretefilled steeltubular column combined with
temporary column and permanent column should be adopted for the vertical
support components of the cutandcover section, and the middle pile foundation (also used as uplift
pile) shall be set under the column. In addition, the timehistory analysis method is used to verify that the main structure of
the station can meet the requirements of seismic performance Ⅱ under levelE3 earthquake effect.
CAI Leichuan, TIAN Qingbiao, ZHAO Jing, TANG Zhitong, HAN Mengwei, WANG Lei, HU Richeng
. Discussion on Rehabilitation Design of Tiantongyuan East Station of Beijing Metro[J]. Tunnel Construction, 2021
, 41(S1)
: 329
.
DOI: 10.3973/j.issn.2096-4498.2021.S1.042
