A clear and systematic cognition of large deformation
of tunnel surrounding rock is important for the further and specific research.
Based on the existing research, large deformation of tunnel surrounding rock is
defined as the deformation phenomenon, with obvious time effect and plastic
deformation, exceeding the allowable range of specification and having
seriously effects on the normal usability of tunnel engineering and even
ultimately leading to the loss of the overall structural stability of tunnel.
From the angle of deformation origin, the types of large deformation of tunnel
surrounding rock are reclassified to expansion type, high ground stress soft
rock type, loess type, high ground temperature type, and compound type. The
deformation mechanism, constitutive model and supporting theory of large
deformation of various surrounding rock types are summarized, and the control
measures and construction methods are taken for different types of large
deformation of surrounding rock. In this
process, it was found that there are still some deficiencies, and possible
future development trends are put forward: (1) The mechanism of large
deformation of tunnel surrounding rock will be improved, and the law of large
deformation and stress characteristics of tunnel surrounding rock are
summarized through field detection, model test and finite element analysis and
simulation, which can provide scientific basis for engineering practice and
achieve accurate support of large deformation. (2) The classification control
measures for large deformation of surrounding rock of different types of
tunnels are unified. Due to the variety, complexity, and particularity of the
project, it is difficult to summarize the general control measures for all
types of large deformation of surrounding rock of various tunnels. However,
based on a large number of large deformation cases, the formulation of control
measures for specific large deformation type of different types of tunnels
still has high engineering reference value.
XU Chongbang, ZHENG Ziteng, XIN Hongsheng, MIU Yuanbing, DU Ju
. Classification and Prospect for Large Deformation of
Tunnel Surrounding Rock[J]. Tunnel Construction, 2023
, 43(S2)
: 27
-40
.
DOI: 10.3973/j.issn.2096-4498.2023.S2.003