Due to the construction of more doubletrack
projects, limitation of geological conditions and existing buildings and the
demand of comprehensive development of urban underground space, there will
inevitably be many close or overlapped tunnels. In this paper, the seismic
dynamic response characteristics and interaction law of the overlapped tunnel
structure are discussed. The vibration platform tests on three seismic
intensities and five working conditions are completed under the action of
seismic waves. The peak strain values of the circumferential and axial strains
of the upper and lower tunnels under different loading conditions are analyzed
and studied. The test results show that: (1) The higher the seismic intensity,
the greater the seismic hoop strain. (2) The circumferential strain peak value
of the underpass tunnel is larger than that of the overpass tunnel; the
circumferential strain peak value of the underpass tunnel sidewall is the
largest, and the part of the underpass tunnel inverted arch is the second
large, followed by the part of the overpass tunnel inverted arch and sidewall.
(3) When the seismic intensity is small, the peak value of circumferential
strain of the two cross tunnels is basically the same. (4) When the seismic
intensity is large, the peak value of the circumferential strain of the
underpass tunnel is much larger than that of the overpass tunnel. (5) The peak
value of axial strain in the underpass tunnel is larger than that in the
overcross tunnel, and the peak value of axial strain in the inverted arch of
the overcross tunnel is the largest, followed by the inverted of the overcross
tunnel, and the peak value of axial strain in the crown of the overcross tunnel
and the underpass tunnel is the smallest. Finally, the dynamic response laws of
the overcross tunnel and undercross tunnel are compared and analyzed.
XU Qingjun, LIANG Yu, WU Honggang, LEI Hao, ZHANG Xiongwei
. Study on Dynamic Response of Orthogonal Overlapped
Tunnel[J]. Tunnel Construction, 2020
, 40(S1)
: 90
-97
.
DOI: 10.3973/j.issn.2096-4498.2020.S1.012
