To quickly and efficiently obtain the insitu
stress of the tunnel axis to meet the practical engineering demands, an initial
insitu stress interpolation calculation method for a
deepburied long tunnel is established based on the
geological statistical Kriging method. The crossvalidation
iteration is used to calculate each error indicator. The optimal function model
is selected from various variogram models for geostress interpolation
calculation to obtain the principal stress value and maximum horizontal
principal stress direction of the tunnel section. Next, considering the
influence of different strata and faults, the principal stress results of the
tunnel axis are corrected to obtain the principal stress value and tunnel axis
direction. The proposed method, based on a small amount of insitu stress measurement data, is not affected by tunnel survey data
and engineering route plan adjustments, resulting in quickly and efficiently
obtaining insitu stress value and tunnel axis
direction. The engineering application shows that: (1) The calculation value of
the proposed method has high fitting accuracy with the measured insitu stress value with a fitting degree of approximately 85% for the
maximum horizontal principal stress. (2) The principal stress values of the
tunnel axis and the maximum horizontal principal stress direction were obtained
through interpolation. The maximum horizontal principal stress of the tunnel
was 52.50 MPa, and the principal stress direction of the tunnel was primarily
in the NW direction, with local sections in the NE direction.
REN Yang
,
WU Yuehua
,
LI Tianbin
.
Calculation Method and Application of Initial InSitu
Stress Interpolation in
Longitudinal Section of DeepBuried Long Tunnel
[J]. Tunnel Construction, 2023
, 43(11)
: 1908
-1915
.
DOI: 10.3973/j.issn.2096-4498.2023.11.010
