Large Sections Mutant Small Section Construction Technology

In recent years, as China’s rapid economic development, urbanization, ground transportation growing very rapidly, resulting in increasing pressure of urban pu blic transport, while the city subway is the main way to alleviate this contradicti on. All major cities have subway construction starts, subway to the rapid develo pment in the country. The subway construction notable features are:peri-urban e nvironment is complex, many factors, such as the subway station surrounding bui ldings and more and more municipal roads under various pipelines, underground duct entrance channel and more. As Undercutting subway station entrance channe1slope was relatively large, construction, mining station from the entrance chann el opening construction, while the conventional construction entrance channel ope nings is generally at the station after the completion of the second lining tissue, so that the entire project duration long time. In the case of ensuring structural s afety, how to take effective methods and measures to overcome the adverse effec ts of group-hole effect, shorten construction time, researchers at the station early on branch openings, station construction and construction entrance channel paralle1operation, thus shortening the construction period, Construction costs will be eff ectively controlled, for similar projects to provide a reasonable construction meth od.Domestic large section of the tunnel to connect with small cross section thr ough a small section at the construction methods to pick the large section of the gradient-based methods, or to shield France from small to large cross sections i mplemented. Chronologically in the construction commonly used in the lining aft er the completion of the main two entrances, air duct, tunnel boring way. But in order to drill and blast tunneling and can not penetrate the gradient method and the same subject and affiliated organizations excavation construction, assembly-li ne approach that is "super mutant small cross section construction method of D omestic been reported. Through this research project will make up for this defici ency, hard rock areas for construction of underground excavation has good applic ation prospects.This thesis combine monitoring and measuring techniques, blasting control te chnology, tunnel reinforcement technology and mathematical statistical analysis te chniques to study the large section to open a small section of the timing; study large section to open a small section of tunnel openings of the rock body stress, displacement changes, and its force structure large section tunnel effect; study o f openings and a large section tunnel near the range of technical reinforcement measures; research tunnel blasting small section on the impact of a large section tunnel, and its technical reinforcement measures.