The use of lateral shieldlaunching
technology for a doubletrack tunnel in a main metro
line without trenches that will allow doubletrack
shield launching and simultaneous driving in a complex environment is discussed
by taking the NiujieJinrongjie section of Beijing
metro line 19 as an example. Based on an analysis of the control conditions of
shield laterallaunching technology, a compositemined singlechannel structure that combines
a largespan pilebeamarch shieldlaunching crosspassage, an premined section, and a
grounding section is studied. A system for independent doubletrack shield launching and simultaneous driving is established, and
a technical scheme for lateral launching of the shield that has a flexible
layout, occupies a limited amount of land, and is associated with a
controllable environmental safety risk is developed. In addition, based on key
technical factors such as the construction sequence for the composite
structure, the mining excavation method, advance support measures, stratum
reinforcement measures, etc.〖KG-*3〗, a stratumstructure numerical simulation
model that can be used to predict and analyze the structural and environmental
risks of the composite singlechannel structure and to
verify the safety and feasibility of the technical scheme is established.
LI Aimin
,
LI Hong′an
,
LI Bin
.
A Design Scheme for Lateral Launching of a Double Track
Shield Tunnel
Using a Mined Single Channel with a Composite Structure
[J]. Tunnel Construction, 2021
, 41(7)
: 1188
-1196
.
DOI: 10.3973/j.issn.2096-4498.2021.07.013
