AIMS To study the relation between lung function decrease and cumulative exposure to dust and gases in tunnel construction workers. METHODS A total of 651 male construction workers (drill and blast workers, tunnel concrete workers, shotcreting operators, and tunnel boring machine workers) were followed up by spirometric measurements in 1989-2002 for an average of six years. Outdoor concrete w...

Based on real-time monitoring data of harmful gasses during blasting and excavation Yuelongmen Tunnel Chengdu–Lanzhou Railway, this study summarized laws distribution characteristics gas escape intensified by the excavation, effectiveness shotcreting grouting for water blocking to inhibit is verified. Then, taking water-containing gas-containing voids as carriers, considering influence differen...

Strengthening and rehabilitation of underground tunnels are frequently an inseparable part upgrading the railway network. Short fibres have been replacing pre-installed steel mesh with technical economic advantages on stabilization securing rock soil systems in through fibre reinforced shotcrete (FRS) technology. The strengthening efficiency this technology can be even increased by shotcreting ...

OBJECTIVES Personal air measurements of aerosols and gases among tunnel construction workers were performed as part of a 11-day follow-up study on the relationship between exposure to aerosols and gases and cardiovascular and respiratory effects. METHODS Ninety tunnel construction workers employed at 11 available construction sites participated in the exposure study. The workers were divided ...