Shotcrete
construction has some drawbacks, such as poor working environment, high energy
consumption, slurry running, and slurry leakage. Thus, a novel support scheme
by integrating a steelcorrugated plate combined with a
mold bag concrete is proposed. A field experiment is conducted on a circular
shaft using the inverted hanging shaft wall reverse construction method, and the
change law of perfusion pressure and its influence are analyzed. The following
are the results obtained in this study. (1) The mold bag concrete can fill the
structural gap and reserved space between the excavation surface and steelcorrugated plate to form a composite structure with certain strength
and stiffness, which can maintain the stability and resist the deformation of
the excavation face. (2) The onsite monitoring results
show that in the process of concrete pouring, the concrete in the mold bag has
good fluidity and can completely fill the mold bag. Then, the pouring pressure
dissipates gradually, and the circumferential strain produced by the steelcorrugated plate is small. The supporting structure is subjected to
uniform force under such working conditions. (3) The geotextiles selected in
the test have the characteristics of air and water permeability, which can
effectively solve the problems of slurry running and leakage during shotcrete
construction. (4) The proposed supporting structure provides innovative ideas
for tunneling and similar underground engineering support technology, which is
of great significance.
ZHANG Mingju
,
HAN Yixuan
,
LI Pengfei
,
GUO Caixia
,
WU Aiguo
. Field Experimental Study on SteelCorrugated
PlateMold Bag Concrete Supporting
Structure of Circular Shaft#br#[J]. Tunnel Construction, 2022
, 42(7)
: 1146
-1155
.
DOI: 10.3973/j.issn.2096-4498.2022.07.003
