Many issues arise when constructing multiarch
tunnels in weak surrounding rock conditions, including difficult load
conversion and construction techniques as well as high construction risks.
Therefore, the design and construction methods of Guanyinyan tunnels in
Changsha are discussed, and the construction procedures of the main tunnel and
the auxiliary tunnels are proposed. The interaction response of the surrounding
rock and structure, feasibility of the construction process, and safety of the
support structure under the conditions of the multitunnel construction of a
fourarch tunnel and interaction between main and
auxiliary tunnels are analyzed using numerical simulation and onsite monitoring
methods. The results show the following. (1) The construction process of the
main tunnel and then the auxiliary tunnels is safe and feasible. (2) The
construction of a multiarch tunnel will increase the
cavern′s excavation disturbances and complicate the
structural stress, and attention should be paid to the tunnel risk posed by
laterexcavated tunnels. (3) The construction
disturbance between adjacent caverns has a more significant impact than that
between separated caverns. The onsite implementation results show that the
surrounding rock deformation is stable and the supporting structure is safe
during the tunnel construction process, confirming the feasibility of the
design and construction method of twoway tenlane fourarch tunnels with different spans.
BAI Shu
,
YANG Xiong
,
LI Yuzhe
,
GONG Feng
,
YANG Junsheng
. Design and Construction Method of TwoWay
TenLane FourArch Tunnels with Different Spans[J]. Tunnel Construction, 2022
, 42(3)
: 478
-486
.
DOI: 10.3973/j.issn.2096-4498.2022.03.017
