Large deformation is a key problem in tunnel
engineering. In this paper, the definition, classification and mechanism,
judgment criteria, control theory and measures for large deformation of
surrounding rock in China and abroad are analyzed and summarized. Meanwhile,
the control philosophy of large squeezing deformation is introduced, and
suggestion that full play should be paid to the role of the support system in
improving the loadbearing capacity of the surrounding
rock as much as possible rather than passive loadbearing
is put forward. Furthermore, the key research trend and breakthrough point of
the large squeezing deformation are discussed, and the highstrength prestressed primary (type) support
system and its components and key points are proposed by emphasizing its core
importance in the support system. Finally, it is verified by means of field
test that the proposed highstrength prestressed primary (type) support system can better control the
displacement of the large deformation surrounding rock and shorten the time for
the deformation to become stable. The research results can provide a feasible
new concept and support technology system for the contorl of the large
deformation of tunnels of the same type.
LI Zhijun
,
GUO Xinxin
,
MA Zhenwang
,
YANG Tielun
,
XU Jianqiang
. Research Status and Highstrength
Prestressed Primary (type)[J]. Tunnel Construction, 2020
, 40(6)
: 769
-782
.
DOI: 10.3973/j.issn.2096-4498.2020.06.001
