With the increase of crosssection
size of mining tunnel in metro station by cutandcover and mining method, the structural risk multiplies. In order to
reduce the mining crosssection size as far as possible
under the premise of reasonable function and further reduce the structural
risk, the architectural design optimization concept of returning to the
standard requirements of architectural design standards, combing out the blind
spots of electromechanical design standards, and promoting the adjustment of
mechanical and electrical design schemes is proposed by incorporating the high
risk of mining tunnel structure into the design evaluation system. According to
project practice, three specific measures are summarized as follows: (1)
Simplifying the partial functions of the mining tunnel, and simplifying or
transferring the functions to the open excavation space. (2) Reorganizing the
geometric relationship between the functions in the mining tunnel group, and
effectively planning and reducing the scale. (3) Paying attention to the
favorable stress characteristics of the circular and horseshoeshaped crosssection of the tunnel, and
making the functional shape of the regular crosssection
seamless with the tunnel. The measures mentioned above are applied to
Qingxiushan Station in Nanning Metro Line No.3, which can effectively reduce
the number and the crosssection size of tunnels, and
expand the distance between tunnels. The comprehensive optimization crosssection area reaches about 30%, which can reduce the risk of mining
structure.
ZHANG Jin
. Crosssection Optimization of Mining
Tunnel of Metro Station by CutandCover and Mining Method: a Case Study on
Qingxiushan Station on Nanning Metro Line No. 3[J]. Tunnel Construction, 2020
, 40(10)
: 1480
-1487
.
DOI: 10.3973/j.issn.2096-4498.2020.10.012
