A new type of underground structure, underground
bundled integrate tunnel(UBIT), which relies on transverse
prestress, is proposed to reduce the impact of underground engineering
construction on urban ground roads, pipelines, and buildings (structures) and
improve the stress of underground passage structure. According to the
engineering demands, a fullscale experimental study of
the quarter structure is conducted to investigate the deformation response of
the structure under design and overload conditions. The results reveal the
following: (1) The development of structural deformation can be divided into
elastic stress and nonlinear stages. (2) The weak point is located in the joint
at the structure′s top quarter span, and the separation
stress is 2.106 MPa. (3) The bundled integrate structure can bear twice the
design load without separation, the structure stiffness is reduced by 60% after
the joint separation, and the structure is not damaged and still has bearing
capacity under four times the design load. (4) Under overload conditions, the
relationship between the prestress strain increment and the vertical deflection
of the structure is nearly linear proportional.
BI Xiangli
,
ZHANG Zhongjie
,
LIU Shu
,
PAN Weiqiang
,
JIAO Bochang
,
LIU Xian
. FullScale Experimental Study on
Mechanical Behaviors of Bundled Integrate Structure in
Saturated Soft Soil Area[J]. Tunnel Construction, 2022
, 42(6)
: 953
-959
.
DOI: 10.3973/j.issn.2096-4498.2022.06.002
