The pipe roof support can be used in metro station
with rectangular crosssection constructed by PBA method in
advance. The transverse pipe roof is densely arranged in PBA mined metro
station with rectangular crosssection. Firstly, the
simplified methods and calculation mechanisms of elastic foundation beam,
simply supported beam and clamped beam of the "loadbeam model" of pipe roof are summarized. And then, the three
models of elastic foundation beam, simply supported beam and clamped beam are
used to calculate the stress and deformation of pipe roof of Ping′anli Station
on Beijing Metro Line No. 19, and the calculation results are compared with
monitoring results. Finally, the influence factor analysis is carried out on
stress and deformation of pipe roof of different projects with different
geological parameters. The research results show that: (1) The bending moments
and midspan deflections calculated by elastic
foundation beam model are between the results calculated by clamped beam model
and simply supported beam model, and the results calculated by the elastic
foundation beam and the simply supported beam model are more consistent with
the measured data; however, the models of simply or clamped supported beam can
not reflect the deflection at the sidewall and the influence of the formation
parameters and the pipe thickness. (2) The maximum bending moment occurs in the
midspan of simply supported beam, thus the security
can be ensured by using midspan moments of simply
supported beams. (3) The excavation span and soil thickness (load) affect the
bending moment and deflection of pipe roof greatly, and the influence of span
is greater. (4) The foundation bed coefficient and pipe thickness affect the
bending moment of pipe roof little, while they can reduce the deflection to a
certain extent.
SONG Zhuohua
,
DONG Lipeng
,
TAO Lianjin
,
ZHAO Xu
,
ZHANG Yu
. Research on Calculation Method for Stress and
Deformation of Transverse Pipe Roof in Subway Station with Rectangular Crosssection Based on Transfer Matrix[J]. Tunnel Construction, 2020
, 40(12)
: 1733
-1741
.
DOI: 10.3973/j.issn.2096-4498.2020.12.007
