Upton–Avenue Market station (formerly known simply as Upton station) is an underground

Metro SubwayLink The Metro SubwayLink is a rapid transit line serving the greater area of Baltimore, Maryland, in the United States, and is operated by the Maryland Transit Administration. The segment in Downtown Baltimore is underground, and most of the line out ...

station in West

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located near the intersection of Pennsylvania Avenue and Laurens Street. The station takes its name from the surrounding Upton neighborhood and the nearby Avenue Market at 1700 Pennsylvania Avenue. It is the ninth most northern and western station on the line.

Station layout

History

Upton–Avenue Market station was referred to as the Laurens Street station during its planning and construction, in reference to the street which intersects Pennsylvania Avenue nearby.

Excavation and construction

The Laurens Street section of tunnels at Upton–Avenue Market station were constructed in a

cut-and-cover A tunnel is an underground passageway, dug through surrounding soil, earth or rock, and enclosed except for the entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube constr ...

operation through deeply weathered residual rock from a parent

granitic A granitoid is a generic term for a diverse category of coarse-grained igneous rocks that consist predominantly of quartz, plagioclase, and alkali feldspar. Granitoids range from plagioclase-rich tonalites to alkali-rich syenites and from quart ...

gneiss Gneiss ( ) is a common and widely distributed type of metamorphic rock. It is formed by high-temperature and high-pressure metamorphic processes acting on formations composed of igneous or sedimentary rocks. Gneiss forms at higher temperatures an ...

material. Extensive exploration and mapping of the subsurface conditions was conducted prior to excavation and construction in order to obtain a detailed understanding of the heterogeneous mixture of soft and hard residual material at the site. This profile informed the support and mining procedures implemented for the project. Classification of the residual materials informed the tunnel design, which was supported by liner plates, steel ribs, posts, wall plates, and invert struts; the final lining was made from reinforced, cast in-place concrete. The presence of hard, dense rock-like fragments among the residual material necessitated some blasting methods in addition to conventional earth excavation methods.

References

External links

Laurens Street entrance from Google Maps Street View
Metro SubwayLink stations located underground Railway stations in the United States opened in 1983 1983 establishments in Maryland Railway stations in Baltimore {{Maryland-railstation-stub