In order to study the ground settlement law during the
construction of the singlelayer mined station in silty sand
layer by columnhole method, the method of grouting
test, numerical analysis and onsite monitoring and
measurement are combined and adopted. The problems in design and construction
of columnhole method in silty sand layer are analyzed,
and an optimized design method is put forward. The results show that: (1) The
grouting reinforcement can significantly improve the moisture content, cohesion,
internal friction angle and compression modulus of silty sand layer. (2) The
ground settlement and settlement groove induced by columnhole method are large in silty sand layer. (3) Problems such as
narrow construction space, large sidespan construction
settlement, and difficulty in comprehensive grounding construction exist in
columnhole method construction. (4) The optimized
singlelayer mining construction scheme are
characterized by small settlement, mechanized construction, time saving and convenient
construction.
NIU Bin, HAN Congcong, GUO Ting, ZENG Deguang
.
Comparison and Selection of Construction Methods for Singlelayer
Mined Station in Silty Sand Stratum
[J]. Tunnel Construction, 2020
, 40(S1)
: 314
-320
.
DOI: 10.3973/j.issn.2096-4498.2020.S1.040
