Ultradeep shaft construction in centrallylocated urban areas with large building density and small available
space often faces a series of technical problems. Hence, a new shaftconstruction technology and automatic mechanical machine are
introduced to address these problems. Based on the construction of a fullyprefabricated assembled shaft, the design and assembly of
prefabricated shaft segments, undrained mechanical excavating technology,
sinking control technology, shaft attitude control, and deviation correction
technology are studied. The engineering practices show the following: (1)
Prefabricated construction and undrained excavation can effectively control the
instability risk of sidewalls and excavation faces, as well as the surface
settlement. (2) Multiple attitude monitoring system with deviation judgment
standards and correction measurements can ensure the shaft axis. (3) Adoption
of overexcavation combined with the controlled sinking
method can completely avoid sudden sinking and stagnation.
ZHANG Zhenguang
,
XU Jie
,
WANG Sheng
,
JIANG Haili
,
HAO Liang
,
FU Wurong
. Underwater Mechanical Tunneling Technology of an UltraDeep
Assembled Shaft in WaterRich
Stratum: a Case Study of Sinking Shaft Underground Parking
Garage in Nanjing, China[J]. Tunnel Construction, 2022
, 42(3)
: 492
-500
.
DOI: 10.3973/j.issn.2096-4498.2022.03.019
