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Huaihai Road station on Line 13 to be deepest subway in the city
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FOR some commuters on Metro Line 13, it will be one long ride down the escalators to reach the subway station.
The under-construction Huaihai Road M. Station is — for the time being at least — the deepest subway after workers dug 33 meters beneath the ground, officials said yesterday. It is also the latest major development work to exploit the underground space.
The station, coming up near Ruijin Road, will be on Level Six below the ground to avoid Line 1. The area is also one of the busiest commercial roads in the city, Shanghai’s construction authority said yesterday.
The top three levels of the station will have stores and restaurants while the bottom three levels are for the subway and station.
On completion, the line will run through downtown and connect Jiangqiao in Jiading District in the west to Pudong’s Zhangjiang area in the east. Part of Line 13 is already under operation.
Shanghai has developed over 56 million square meters of underground space across the city. They include subways, underground roads, and electricity substations as well as commercial and cultural venues.
“The underground development will ease traffic congestion and increase the efficiency given the city’s limited land area,” said Tang Wei, deputy president of the Shanghai Construction Group, which has several underground projects.
For instance, the city’s biggest underground project stretching 450,000 square meters is being built beneath the former China Pavilion and other pavilions at the 2010 Shanghai World Expo site in the Pudong New Area.
The underground space — only 200 meters away from the Huangpu River — will connect 28 office buildings of state-owned companies such as the Commercial Aircraft Corporation of China and Baosteel.
“The underground space will include stores and restaurants and connect to Metro Line 8. It will be the biggest development work after the Expo,” said Xi Qunfeng, vice president of the Shanghai Expo Development Group.
But experts have voiced fears of land subsidence. The city’s land has subsided by 29 centimeters in the past 40 years, becoming a major geological threat for a city with an average altitude of only 4 meters above sea level.
“The land is composed of typical soft soil along with some loose sand and stones, while the underground water level is also quite high, which are great challenges for underground developments,” said Xu Liping, chief engineer with the Shanghai Geotechnical Investigations and Design Institutes Co Ltd, and a local legislator.
The Hongqiao area in Changning District, and the Sanlin and Zhangjiang areas in the Pudong New Area have had the most severe land subsidence.
Construction companies must evaluate land before digging foundation pits of 7 to 15 meter deep. A third party evaluation report has to be submitted to the planning and land authority if the foundation is deeper than 15 meters.
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