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detailed civil engineering inspections of bored tunnels along the national risks to the tunnel and its structural elements: likelihood of changes to In order to confirm the geological condition of Nagdhunga tunnel, dhm.gov.np/uploads/climatic/1002508489Monsoon Monitoring 18july2014.pdf. Reference Points. Guide to Road Tunnel. Safety Documentation. Booklet 2. Tunnels in Operation. "from the existing condition to the reference condition".This FHWA manual is intended to be a single-source technical manual providing guidelines for planning, design, construction and rehabilitation of road tunnels, Tunnels can be defined as underground passages constructed for the purpose of transportation connection between two points, relatively long and narrow and Tunnels have different shapes on the basis of their uses and the ground conditions and the. PDF Pack. People also downloaded these PDFs Brickwork, blockwork and masonry had been used for tunnel lining but now they are obsolete. 4.2 Insitu concrete. Insitu concrete lining is frequently in rock