Translation. Region: Russian Federation –
Source: Moscow Government – Moscow Government –
An important disclaimer is at the bottom of this article.
Since 2011, metro construction has involved tunneling under the Yauza, Moskva River, Setun, Setunka, and Ochakovka rivers. This was reported by the Deputy Mayor of Moscow for Urban Development Policy and Construction. Vladimir Efimov.
"Since 2011, tunneling under rivers has been carried out during the construction of the Big Circle, Solntsevskaya, and Troitskaya metro lines. The Moscow Metro's connecting tunnels are constructed using tunnel boring machines (TBMs) with diameters of six and 10 meters. The machine creates a circular tunnel, leaving behind a finished outline of prefabricated elements. Sections of the line running under water bodies are constructed with particular care. There are numerous such sections throughout Moscow. Tunneling under a river using a TBM is a complex process that requires careful preparation and the use of specialized technologies to prevent flooding. Key considerations include pressure control in the working chamber using compressors, groundwater drainage, and high-precision navigation," noted Vladimir Efimov.
Under the beds of large bodies of water, there is typically an impermeable clay layer—it's dense and poorly permeable. Tunneling takes place in or beneath this layer. A key feature of tunneling under water bodies is the mandatory shutdown of the TBM 50 meters before the water's edge to inspect the cutting tool for wear. If the equipment breaks down, repairing the damage is much more difficult.
"Work is carried out under high pressure, so strict monitoring of the equipment, its integrity, and the availability of emergency evacuation systems is essential. To protect the tunnel from water, metal-insulated tubes are sometimes used, which are installed as each section is constructed. Precise adherence to the planned route and depth is critical to avoid damaging existing structures and encountering unexpected geological conditions. Various methods can be used to reduce soil permeability, such as the injection of special solutions," added Maxim Gaman, CEO of Mosinzhproekt JSC.
Construction is currently ongoing on the Rublevo-Arkhangelskaya, Biryulevskaya, and the second stage of the Troitskaya metro lines. Excavations are planned under the Moskva River, the Novinki backwater, and the Gorodnya, Sosenka, and Desna rivers. These sections total 3,130 meters.
Earlier, Sergei Sobyanin announced the beginning of tunnel excavation between the stations "Dream Island" and "Klenovy Bulvar".
Mosinzhproekt is the general designer and general contractor for the construction of new Moscow metro lines and stations. Since 2011, the holding company has contributed to the construction and reconstruction of 84 metro stations, over 180 kilometers of lines, the construction of eight new depots and a car repair plant, and the reconstruction of five more depots.
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