To realize safe, rapid, and highlyefficient
mechanized construction of long mountainous railway tunnels using drilling and
blasting methods, a case study is conducted on a tunnel project of the Hubei
section of the ZhengzhouWanzhou railway. A working
method of "scientific research, test verification, popularization, and application,"
the exploration research, and field tests of largescale
mechanized construction technology of tunnels are performed. According to
investigations and engineering practice, some conclusions are drawn as follows:
(1) The mechanized construction method of tunnels is a systematic change based
on the traditional method. (2) The traditional multibench method, passive
support, and surrounding rock pressure sharing in Grades Ⅳ and Ⅴ surrounding rocks are unsuitable for
the large crosssection mechanized method. (3) The key
points of large crosssection mechanized construction
are fast excavation, fast support, active support, and fast closure. (4) The
tunnel structure design adopts the surrounding rock pressure calculation method
based on the standard loose pressure, which differs from the actual situation,
and can be designed according to the deformation pressure calculation method.
(5) For the tunnel constructed by the large crosssection
mechanized method, the advance active support system of the tunnel face and
tunnel body are the keys to the surrounding rock stability near the tunnel
face.
LIU Ke
.
Key Design Technology for Large Cross-Section
Mechanized Construction of Mountainous Tunnels
[J]. Tunnel Construction, 2022
, 42(4)
: 703
-713
.
DOI: 10.3973/j.issn.2096-4498.2022.04.020
