Water ingress events and their elimination in tunnels with high-precision reinforced concrete lining

Transportation problems in megacities are mostly solved using tunnels made in the underground space with the help of tunnel boring machines and reinforced concrete blocks of high-precision lining tubing. The weakest point in the waterproofing in the split-type reinforced-concrete lining for the transportation tunnels is the butt junction of the blocks. Sealing of the junctions is ensured by placing a rubber gasket along the high-precision block perimeter. During shield-driven tunneling, the tunnel lining can be deformed, which results in the seal failure of the gasket and in the permeability of the tunnel lining. The widely applied technology of sealing permeable butt junctions between the blocks of lining includes preliminary restraint (calking) of defective welds in the split-type reinforced concrete lining with repair materials and subsequent injection of the calked weld with methacrylate gel using a set of packers. Gel is injected in a void bounded by the faces of the reinforced concrete lining blocks on two sides, by the rubber gasket on the side of rock mass and by the calked repair material on the back side of the lining. A relatively thin membrane generated in the void is incapable to stand a high hydrostatic pressure, and the repair effect is non-durable. The most promising and effective method to eliminate water ingress events is the technology of injection of a single-component elastic polyurethane resin behind the sealing gasket of the tunnel lining through needle-like packer, without damaging the structure of the reinforced concrete block. The sealing rubber gasket serves in this case as a barrier for injection and spreading of the resin behind the tunnel lining, and enables effective elimination of water ingress in the tunnel.

Keywords: underground structures, water ingress events in subway tunnels, water impermeability of lining junctions, injection behind the lining, needle-like packer, single-component elastic polyurethane resins, repair and renewal operations.
For citation:

Zakorshmennyi I. M., Zakorshmennyi A. I. Water ingress events and their elimination in tunnels with high-precision reinforced concrete lining. MIAB. Mining Inf. Anal. Bull. 2022;(4):17-32. [In Russ]. DOI: 10.25018/0236_1493_2022_4_0_17.

Issue number: 4
Year: 2022
Page number: 17-32
ISBN: 0236-1493
UDK: 624.191.2
DOI: 10.25018/0236_1493_2022_4_0_17
Article receipt date: 14.01.2022
Date of review receipt: 18.02.2022
Date of the editorial board′s decision on the article′s publishing: 10.03.2022
About authors:

I.M. Zakorshmennyi, Dr. Sci. (Eng.), Assistant Professor, Leading Researcher, Institute of Problems of Comprehensive Exploitation of Mineral Resources of Russian Academy of Sciences, 111020, Moscow, Russia, e-mail: zakorshmenniy_i@ipkonran.ru, ORCID ID: 0000-0001-9153-673X,
A.I. Zakorshmennyi, Cand. Sci. (Eng.), Chief Specialist of Quality Service, Mosmetrostroy JSC, 127051, Moscow, Russia, e-mail: zakman008@gmail.com, ORCID ID: 0000-0002-6004-2558.


For contacts:

I.M. Zakorshmennyi, e-mail: zakorshmenniy_i@ipkonran.ru.


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