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Line 2 y Ramal - Red Básica Metro Lima y Callao - Conditioning of different types of soils encountered during the tunnel excavations with 2 TBMs (EPB and Variable Density)

Magro J.L.; Calleja M.; Bono R.; Lacullo S. · Tunnelling for a Better Life - Proceedings of the ITA-AITES World Tunnel Congress, WTC 2024 (2024) · DOI: 10.1201/9781003495505-259

Resumen

The Project for the Lima and Callao Metro Line 2 and a branch of Line 4 (Av. Faucett - Av. Gambetta) consists in the construction of an automatic underground metro line, on the East-West route of the city of Lima, with a length of 27 km (Line 2 of Red Base of Lima) and an 8 km section (Line 4) in correspondence with Elmer Faucett Avenue, from Óscar Benavides Avenue (Colonial) to Néstor Gambetta Avenue. The area of the city served by this new metro line will include approximately 2,4 millions of people. The mechanized tunnel section will be 17,5 km long and located between 15 and 25 m with a maximum working pressure of 3 bar. The Project also contemplates the construction of 35 stations (no. 27 on Line 2 and no. 8 on Line 4) built with the Cut & Cover methodology and the construction and commissioning of two railway depots underway serving Line 2 and Line 4 of the metro. Due to the highly variable geological conditions, the tunnel will be executed by using two Tunnel Boring Machines (TBMs), one Earth Pressure Balance (EPB) and the other Variable Density (VD) TBM type. These two TBMs are manufactured by Herrenknecht (HK) and have the excavation diameter 10,27 m and9,26m the final inner diameter. The geology along the tunnel alignment is particularly complicated, based on large alluvial deposits with low presence of fines and excavating sections under water table with high permeability ground. The conditioning of the different types of soils encountered along the excavation of the tunnels plays a crucial role in the appropriate operations of the machines, for the correct maintenance of the pressure at the excavation face, the performance optimization, and the mitigation of the cutterhead wear.