Ventilation and Humidity Control in Underground Utility Tunnel: an Under-Studied Topic_Crimson Publishers

Background

Underground utility tunnel refers to a passage built underground to accommodate two or more types of urban engineering pipelines, including water supply pipes, sewer pipes, steam, gas, electricity, fiber optics, television cables, telephone cables, etc. It allows not only comprehensive utilization and resource sharing of underground space but also an easy and safe access to these service infrastructures for regular inspections and maintenance that would otherwise require recurring street works in the case of direct burial trenches, impacting on traffic, business, and environment. The initial investment is high but can be compensated by later benefits in maintenance.

Modern municipal utility tunnels can be dated back to 1850’s when Paris built its first man-accessible tunnel that hosted water supply, sewage, and compressed air pipelines [1]. Since then many cities have embraced the ideas of utility tunnels to improve the quality of municipal services and city resilience. For example, in Japan, utility tunnels are considered effective in reducing the catastrophic effects of earthquakes. Though China built its first utility tunnel in 1959, not until recent years has the country seen fast and rapid development. Having long been troubled by frequent flooding and the repeat street excavation for utility maintenance, the Chinese government launched a large promotion plan for the construction of utility tunnel and released its first technical code in 2015 [2]. From 2015 to 2016, the government financially supported 25 pilot cities for the construction of utility tunnels with a target of 2000km [3]. Figure 1 shows the cross-section of one standard tunnel section in Suzhou, one of the pilot cities. A typical standard section is 200m long while it could be 400meters for some cabins.

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