In this paper, the stateofart and existing problems of waterproofing and drainage of composite
lining tunnel are analyzed. And then the grading of control values of drainage
volume and water pressure, separated waterproofing and drainage system,
waterproofing capacity of surrounding rocks, and the integral waterproofing
effect of waterproof layer and secondary lining concrete are studied. Finally,
some suggestions in terms of design and parameters selection for waterproofing
and drainage system are proposed as follows: (1) For the composite lining
tunnel without special environmental and functional requirements, the drainage
volume of the whole tunnel should be controlled within 1.0 m3/（m·d）, and the maximum water pressure behind secondary lining should be
controlled within 1.0 MPa. (2) In order to reduce the occurrence of water
leakage and guarantee the tunnel structural safety, the drainage system of arch
and sidewall and that of invert should be separately arranged. The seeping
water from arch and sidewall can be drained from side ditch, and that from
invert can be drained from longitudinal central drainage dead pipe. When the
water pressure is high, the water can be drained from longitudinal central
drainage dead pipe to additional side ditch by horizontal drainage pipe, and
the water drainage volume can be controlled by valve on horizontal drainage
pipe. (3) By adopting measures such as ground separation wall(secant pile),
surface grouting, grouting in tunnel, jet grouting, advance pipe roof, advance
pipe curtain, doublelayer lining, etc., the water
leakage can be reduced or even sealed, so as to guarantee the ground strength
and integrity, reduce the water inrush volume and water pressure behind lining,
and further reduce the adverse influence of water drainage of tunnel on
operation and environment.
LI Zhiguo
.
Discussion on Several Issues about Waterproofing and Drainage
Design for Composite Lining Tunnel
[J]. Tunnel Construction, 2020
, 40(11)
: 1615
-1624
.
DOI: 10.3973/j.issn.2096-4498.2020.11.010
