In this paper, the No. 1 entrance and exit project of
Wuding road station of Shanghai rail transit is taken as an example to solve
the construction problems of the fullface mining method without
temporary support and soil reinforcement, and with integration of advance
support and permanent structure in waterrich soft soil
areas. A new mining method with bundled pipe curtains is proposed, which can
also be referred to as the UBIT (underground bundle composite pipe integrated
by transverse prestressing) method, that is, by
transversely tensioning the prestressed tendons, the
discrete and smallsection square steel pipes pushed in
longitudinally are bundled into an integral structure. Combined with the
structural characteristics of this method, the joint model using rigid platespring element coupling, the CT type lock,
the standard pipe, and the corner tool pipe that can meet the negative bending
moment of the joint, the layout method of transverse prestressed tendon are introduced. And through the research of
shearing, bending joint test, and 1/4 structure fullscale
test, it is revealed that the performance of the bundled pipe curtain lies in
the bearing performance of the joint and the effect of the prestressed tendon. Engineering practice and onsite monitoring data show that the application is in good condition,
which further verifies the safety and applicability of the design scheme.
ZHANG Zhongjie
,
LIU Shu
,
LYU Peilin
,
LIU Xian
. Design and Engineering Practice of a New Mining Method
Using Underground Bundle Composite Pipe Integrated by
Transverse PreStressing in Waterrich Soft Soil Area[J]. Tunnel Construction, 2022
, 42(S2)
: 267
-272
.
DOI: 10.3973/j.issn.2096-4498.2022.S2.033
