Upward floating and dislocation often occur to shield
segments during construction. Therefore, a physical property test is conducted
on doublecomponent grout with different mixing proportions of strengthpromoting dry powder (material A) and liquid activator (material B).
On this basis, a novel synchronous doublecomponent
grout with adjustable initial setting time is developed. The results indicate
the following: (1) The initial setting time of synchronous doublecomponent grout can be controlled within 30~60 min by a reasonable
mixing ratio of materials A and B. (2) The initial setting time and fluidity of
the novel doublecomponent grout are principally
controlled by material B. With the increase of the mixing proportion of
material B, the initial setting time and fluidity decrease significantly and
tend to be stable when the mixing proportion of material B is more than 3%. (3)
The strength of the novel doublecomponent grout stone
body is controlled by materials A and B. When the mixing proportions of
materials A and B are 1.5% and 3.5%, respectively, the strength of the stone
body basically reaches the maximum value. (4) The optimum mixing proportions of
materials A and B are 1.5%~3.71% and 1%~2.2%, respectively. The novel
synchronous doublecomponent grout has been applied in
the underground utility tunnel project in the central urban area of Guangzhou,
China, and the assembly quality of segments has been greatly improved. This
indicates that the novel doublecomponent grout has
good filling and pumping performance, and it addresses the construction problem
of synchronous grouting of singlecomponent and
traditional doublecomponent grout in the fullsection surrounding rock stratum.
HUAI Rongguo
,
HUANG Siyuan
,
ZHONG Xiaochun
,
CHEN Xuquan
,
HU Yikang
.
Development and Engineering Application of Novel
Synchronous Double-Component
Grouting behind Shield Segment
[J]. Tunnel Construction, 2022
, 42(9)
: 1521
-1528
.
DOI: 10.3973/j.issn.2096-4498.2022.09.003
