In order to
study the influence of pore water on the stability of hydraulic tunnel during
construction, the MogiCoulomb strength criterion is
adopted based on the elasticplastic theory, and the
elastoplastic zone of liningsurrounding rock is taken
as research object. The analytical solutions of circular tunnel under different
working conditions are derived, including the stress of surrounding rocklining structure, tunnel wall displacement, and surrounding rock
plastic zone radius. Relying on a hydraulic tunnel project in Xinjiang, the
calculation and analysis are carried out to obtain the influence laws of
seepage effect, lining permeability coefficient, and lining thickness on the
stability of surrounding rocklining structure. The
conclusions are as follows: （1）Seepage
effect will greatly change the stress distribution of lining and surrounding
rock, reducing the support reaction of lining to surrounding rock can worsen
the tunnel stability. （2）Reduction
of the lining permeability coefficient will increase the seepage water pressure
at the interface between lining and surrounding rock, reducing the reaction
force can increase the radius of surrounding rock plastic zone and tunnel wall
displacement. （3）Increasing the
lining thickness will change the distribution of seepage field and weaken the
support amplification effect caused by increasing lining thickness, which can
significantly limit the development of surrounding rock plastic zone in the
initial stage, but the subsequent effect is poor.
SUN Helin, JIANG Haibo
. ElasticPlastic Analysis of
Surrounding Rock of Lining Tunnel Considering Seepage
Effect[J]. Tunnel Construction, 2023
, 43(S1)
: 206
-215
.
DOI: 10.3973/j.issn.2096-4498.2023.S1.024
