The authors investigate the
influence of various construction parameters on tunnel structure integrity and
surrounding geological stability during the mechanical cross-passage excavation. A global sensitivity analysis based on the Sobol
method is employed in conjunction with a finite element numerical model that
simulates tunnel structure behavior and auxiliary construction facilities.
Numerical simulations are conducted throughout the entire construction process,
and the results are validated against field monitoring data. Key findings
include: (1) During lateral excavation through the main tunnel for cross-passage, the maximum displacement of the main tunnel increases by
approximately 34% compared to the pre-construction
state, while maximum stress levels rise by 15.5%, and interfacial stresses
increases by 5%－8%.
Stresses within the internal support system range from －12 MPa to 40 MPa. Additionally, structural strains and stresses
exhibit a degree of rebound or reduction after construction completion. (2)
Significant stress and deformation variations are observed near the cutting
ring opening, with principal stress Ⅲ distributions
forming spindle-shaped geometries along the inside and
outer surfaces of the cutting ring cross-section. (3)
The deformation displacement curves from numerical simulations are consistent
with field monitoring data, closely matching average trend curves and
demonstrating similar variation tendencies, thereby validating the accuracy of
the numerical model. (4) Sensitivity analysis indicates varying rankings of
construction parameters′ influence on stress and
deformation. Key influencing parameters
include chamber pressure, propulsion force, torque, and prestress in the
internal support frame. Among these, chamber pressure is identified as the most
sensitive parameter affecting bolt axial forces, which remained within a
controllable range.
MA Yongzheng
,
ZHENG Yi
,
ZHU Yaohong
,
ZHOU Wang
,
NIU Fusheng
,
HUANG Qiang
. Analysis of Global
Sensitivity of Construction Parameters in
Mechanized Cross-Passage Excavation[J]. Tunnel Construction, 2025
, 45(1)
: 98
-108
.
DOI: 10.3973/j.issn.2096-4498.2025.01.007
