Innovative solutions for layout planning and implementation of a metro station and its accessory structures in mountainous cities, China

Abstract

Currently, urban underground space in most mountainous cities in Southwest China has developed slowly. Underground space planning in mountainous cities is often influenced by many factors, such as complex topography, geological conditions and the surrounding environment, so this has severely restricted the expansion of above-ground and underground space. The underground space available is quite compact in mountainous cities and it is common to cross with the foundations of the ground buildings. Therefore, two crucial facts need to be considered when the planning of the center areas in a mountainous city is prepared, including 1) increasing potential demand for underground space and 2) reducing the requisition and demolition of ground buildings. This paper presents an innovative solution for layout planning and implementation of Baoshan South Road Metro Station on Guiyang Rail Transit Line 2 in Southwest China. A new type of “End-mounted & intensive” subway station is designed, which effectively achieves the advantages such as a compact and safe structure, high space utilisation, less expropriation and demolition, and low cost. This innovative scenario improves the carrying capacity of surface environment and it also increases the comprehensive utilisation of underground space in mountainous urban areas. Besides, it has important environmental demonstration significance and economic benefits, promoting the rapid development of rail transit construction in mountainous urban areas.