On 08/10/2021 the TBM Olga - diameter 6 m  - completed the right running  single-track tunnel – 500 m long - between the Kashirskaya station and the transition chamber at the Klenovy Boulevard station on the eastern section of the Big Circle Line (BCL) of the Moscow metro. The excavation was in mixed soils: mainly in fine sands and loams. 

The work was carried out at a depth of 4 to 24 m, in dense urban areas, as well as under the territory of the Kolomenskoye Museum-Reserve. The tunneling of the BCL is already 97% complete, and the overall construction readiness of the line is 88%.  

Four TBMs continue to work at the BCL: In the east of the BCL, 10-m giant TBMs Victoria  and Lilia are driving double-track tunnels  to connect the Pechatniki , Nagatinsky Zaton and Klenovy Boulevard stations;  the 6-m TBM Elena is driving the second tunnel between the Kashirskaya station and the transition chamber.  In the west of the BCL, a connecting line tunnel is being built to the future Aminevskoye depot.  

The construction of the Big Circle Metro Line is the flagship project of the Moscow metro construction. The ring is more than 70 km long and will house 31 stations, 12 of which are already open to passengers. Another nine new and one reconstructed station are planned to be commissioned by the end of the year.  

Click here for a video and for further more detailed information click here for the tunnelbuilder archive and visit https://stroi.mos.ru/ and https://mosinzhproekt.ru/. 41/21.