To investigate the mechanical response characteristics
of a tunnel lining structure under the condition of a sharp increase in the
water pressure in pipetype hidden caverns, numerical
simulations are performed here using the finite difference software FLAC3D to
analyze the force changes and damage characteristics of the lining.
Additionally, the effectiveness of the numerical method is validated through
similar indoor model tests. Furthermore, numerical models for the actual
expansion conditions are constructed to examine the effects of the cavity
location, cavity dimension, and water pressure on the internal forces of the
lining structure. The results reveal the following aspects: (1) When the cavity
is located at the crown, the internal force and displacement of the lining
increase in an "Sshaped" manner with
increasing water head in the cavity. Moreover, the water pressure is 1.35 MPa
when the lining is damaged by water leakage under the test working condition.
(2) Various cavity locations differently affect the internal force distribution
of the lining. Furthermore, when the cavern is located at the crown, the waterpressure resistance decreases by 0.3 MPa compared with those at the
sidewall and bottom, indicating the smallest waterpressure
resistance of the lining structure. (3) Under the same waterpressure conditions, the internal force of the lining considerably
increases with increasing cavity size, and thus the influencing scope of the
cavity broadens.
SUN Xingliang
,
GUO Xuke
,
SI Nan
. Effects of PipeType Hidden Caverns on Tunnel
Lining Structure Under Strong Rainfall Conditions[J]. Tunnel Construction, 2023
, 43(11)
: 1831
-1841
.
DOI: 10.3973/j.issn.2096-4498.2023.11.003
