Abstract: During construction of tunnels, different operations such as drilling holes, blasting, mucking, scaling etc. are done due to which poisonous gases are produced in tunnel. To safe guard the workmen, it becomes compulsory to remove these gases and bring inside the fresh air. Workplaces on tunnel sites are exposed to numerous nuisances and sources of health risk. In order to reduce the pollution caused by dangerous gases and dust, tunnel engineers use ventilation systems. This paper describes the various ventilation systems, and their advantages. It discusses natural ventilation methods and mechanical ventilation methods, along with the purpose, qualities and effectiveness so that workmen can perform the job of tunnelling comfortably. Also, the plant and equipment, engaged safely and efficiently, in tunnel construction operations.

Keywords: tunnel, natural ventilation, dangerous gases, dust, equipment, workmen, safely

| DOI: 10.17148/IARJSET.2020.7417