When metro tunnel crosses hourglass type Karst of
firstclass terrace in Wuhan area, countermeasures should be adopted.
Hence, the dimension, vertical distribution law, filling and developing law of
the Karst are summarized, and the collapse mechanism and risk of hourglass type
Karst are analyzed based on Karst surveying, design and treatment of Hongjianlu
Station and sections ahead of and behind on Wuhan Metro Line No. 6. According
to the features of shallow Karst in Wuhan, the Karst treatment idea of filling
grouting after curtain grouting of rock 15 m below rockface is summarized. The
measures, i.e. rock curtain grouting, Karst cave filling grouting, underground
diaphragm wall bracket, soil layered jet grouting reinforcement, etc., are adopted
for metro station, and those, i.e. rock curtain grouting, Karst cave filling
grouting, sandy soil separation pile, etc., are adopted for tunnel sections.
Furthermore, new technologies of Karst grouting with tube pore forming, slurry
flow monitoring, etc. are also adopted in Karst grouting of Line No. 6, and the
slurry proportions and end slurry standard are discussed. The applicable
results verify the feasibility of the Karst treatment idea and measures.
LI Shenkui, TAO Lan
.
Discussion and Application of Karst Treatment Measures for
Firstclass Terrace in Wuhan Area
[J]. Tunnel Construction, 2020
, 40(S1)
: 307
-313
.
DOI: 10.3973/j.issn.2096-4498.2020.S1.039
