Analysis on Construction Monitoring Scheme of Highway Tunnel with Small Spacing

Monitoring is an important work to measure the rationality of tunnel design and construction, especially for highway tunnel with small spacing.The design of construction monitoring scheme was analyzed based on a practice of small spacing tunnel engineering.The method to determine the monitoring items, monitoring sections, monitoring points and monitoring frequency was pointed out.The monitoring items depend mainly on the construction safety and relevant technical research.The general monitoring items can be set one section average per 50m along the tunnel, and the research monitoring items should be set at least one section in each grade surrounding rock.The experience and conclusions presented can provide reference for the monitoring of similar tunnel engineering.