To rationally determine the support timing of deepburied
tunnels with high ground stress, improve the support structure quality, and
reduce the support cost, a case study is conducted on a deepburied plateau tunnel with high ground stress. Safety factor,
displacement increment, and plastic zone methods are employed to determine the
reasonable support timing of the support structure, and the applicability of
each method is analyzed and compared. The results reveal the following. (1) The
distribution laws of cave wall yield calculated by the three methods agree, it
is easier to yield at the crown and invert than at the waist and foot. (2) The
results of support timings by the various methods differ; under the same buried
depth, the safety distance obtained by the safety factor method is greater than
that obtained by the plastic zone and displacement increment methods. The
engineering analogy shows that the plastic zone and displacement increment
methods are more conservative than the safety factor method; thus, the safety
factor method is recommended when determining the support timing.
JIANG Changwei
,
CHEN Ziquan
,
WANG Bo
,
LI Tiansheng
,
ZHOU Zihan
,
BAO Yeming
. Comparative Analysis of Results of Various Methods to
Determine Reasonable Support Timings of DeepBuried
Tunnels with High Ground Stress[J]. Tunnel Construction, 2023
, 43(1)
: 119
-130
.
DOI: 10.3973/j.issn.2096-4498.2023.01.013
