Since 2009 after inclusion in OP "Transport", predominantly by funding from the European Regional Development Fund (ERDF) and Cohesion Fund (CF) of the European Union with a local co-financing, has started the implementation of large-scale Sofia Metro Extension Project. It includes the construction of Line 2 and a significant extension of Line 1 of the Sofia metro. It is divided into three stages. The first two stages were completed on 31.08.2012.
The total length of sections amounts to 13 km with 13 stations. By this the length of metro lines after the completion of these stages has increased to 31 km with 27 stations and approximate number of passengers carried more than 300 thousand/daily. In 2013 has been launched the third stage of the project.
(CONSTRUCTION 2009 - ІХ.2012)
The financing of this stage is carried out under Priority Axis 3 "Improvement of intermodality in passengers and freight transportation" of OP "Transport" by the ERDF. The grant by the ERDF amounts to 157 million Euros, with co-financing by the Sofia Municipality of 25% of the value of the stage. Application Form for funding together with the Cost-Benefit Analysis was approved by the European Commission in 2009. The final completion of the stage, after its adoption by the State Acceptance Commission at the end of August 2012, has took place in October 2012, as this stage was completed both physically and financially.
Fig. 1. Location of the routes of the Stages from the Sofia Metro Extension Project in the urban planning
There were applied complex design and technological solutions, some of which are unique, due to the complex geological and hydrogeological conditions along the route and the passage under existing facilities, including under existing tunnels of Line 1, under subways, under Lion's Bridge, due to the requirement not to completely stop the traffic around the construction sites, as well as to preserve the archaeological finds in the center of the city.
Tunnels in the section "Nadezhda Overpass - Patriarh Evtimiy blvd." with a length of 3.8 km and 4 stations are double-track tunnels with an inner diameter of 8.43 m, completed by aspecially produced for the conditions of the Sofia Metro tunnel boring machine (sealed hydro-shield) by the German company "Herrenknecht".
Fig. 2. Cross section of the double-track tunnel constructed by the means of shield method and general view of the TBM
Equipment is supplied by leading companies such as Siemens, ThyssenKrupp and others. Metro stations are constructed according to individual architectural solutions, some of them are shown in Fig.
Fig. 3. Figure 3а shows a view of the tunnel boring machine at its entrance in Lavov Most metro station. Figure 3б. shows a view of the already completed MS Lavov Most
Fig. 4. Figure 4а. shows a view from MS Serdika II, and on Fig. 4b. is shown the entrance concourse of NDK station.
STAGE ІІ: LOT 1 – SECTION OF LINE 2 "OBELYA RD - NADEZHDA RD - NAZHDA OVERPASS" AND LOT 2 - SECTION FROM LIKE 1 "MLADOST 1 (MS 13) - TSARIGRADSKO SHOSE BLVD. WITH AN UNDERGROUND PARKING LOT"
(CONSTRUCTION 2009 - ІХ.2012)
The route of "Obelya RD - Nadezhda RD - Nadezhda Overpass" was defined as Lot 1 of Stage II of the Sofia Metro Extension Project due to the necessity to be provided a connection of the area funded by the OP "Transport" (Stage I), with the depot in Obelya area where the trains are being serviced and repaired, and also to provide a fast and efficient transport for Nadezhda, Svoboda, Tolstoy and Vrabnitsa residential districts with a total population of more than 120 thousand people.
In this view and the need for a parallel construction of this section together with the section of the route included in Stage I of the Project, Sofia Municipality has provided partial advanced funding for this and in 2010 has started the construction of the section "Obelya RD - Nadezhda RD - Nadezhda Overpass" (Fig. 1) with a length of 4.16 km, out of which 1.3 kilometers were opened - on overbridge and 2.86 kilometers underground. Three metro stations are underground, and the final is on an overbridge.
Fig. 7. Beli Dunav metro station
To satisfy the increased demand for efficient and safe transport of the population of the territories of the large residential discricts of Mladost and Duzhba located in the southeastern part of the city, in 2009 has began the construction of a section "Mladost I RD - Mladost III RD - Tsarigradsko Shose blvd.", which is part of the section from Mladost to Sofia Airport (Fig. 1) included in the OP "Transport" 2007-2013. It has a length of 2.5 km and 2 underground stations and represents Lot 2 of Stage II from the Project.
Fig. 8. Figure 8а. shows the location of Lot 2 of Stage ІІ in the urban planning, and figure 8бb. shows the MS Mladost III
Fig. 9. MS "Tsarigradsko Shose"
Stage III is a continuation of the first metro diameter from Tsarigradsko Shose boulevard through Druzhba RD to the Sofia Airport as well as the extension after MS Mladost I in Mladost I RD along Al. Malinov boulevard to the Business Park in Mladost 4. The section "Mladost 1 - Business Park Mladost 4" is underground with a length of 2.7 km and 3 metro stations. Section "Tsarigradsko Shose - Sofia Airport " is 5 km long with 4 stations, out of which 2 underground and 2 open - on overbridge and on the terrain level.
Fig. 10. Location and section of Lot 1 from Stage III in Drughba residential district
Fig. 12. shows the location and section of the route of Lot 2 under Al. Malinov blvd.
Extension of Line 2 from MS James Bourchier to MS Vitosha
The route of Metro Line 3 was approved after public hearings and expert council meetings during the second half of 2011. as well as a partial update of the Expert Council in 2012. Route is as follows: "Botevgradsko Shose blvd. - Vladimir Vazov blvd. - Center (Orlov Most, NDK, Bulgaria blvd.) - Krasno Selo RD - Ovcha Kupel RD" with last MS located at the Ring Road and railway of Sofia-Pernik line (Fig. 1). The length of the route is 16 km with 18 metro stations. Futre extensions are planned for the directions: eastwards to Geo Milev and Slatina and westwards along the Doyran street. Herebellow are presented some design solutions for the construction of stations from the third metro line:
Fig. 14. Figure 14а. shows the design of the on-the-ground metro station along Vl. Vazov blvd. and Figure 14b. shows the design of MS Orlov Most, where is made the connection with the existing station of Line 1
Fig. 15. Figure 15а. shows the design of the metro station planned for the crossroad of Bulgaria blvd. and I. Geshov blvd. Figure 15b shows the design of an above-the-ground station at President Lincoln blvd.