Study On The Safety Construction Technology For The Shallow Buried Side Large Span Multi-arch Tunnel

Multi-arch tunnel is a kind of typical structure,highway tunnel in highway tunnel has been fully used,but this type of tunnel in the design,construction,monitoring,there are still some deficiencies in bias multi-arch tunnel,this paper carried out the following research work:(1)based on strength subtraction of Yang Gang 1 # tunnel into the mouth of the cave bias shallow buried large span multi-arch tunnel reasonable excavation sequence of study,by comparing the safety coefficient of the size of the excavation process and get the Yang Gang 1 # tunnel into the hole excavating shallow buried side section to the inside of the tunnel,the lateral tunnel after excavation is a more optimal excavation method.(2)the safety factor of every construction node size is studied,pointed out that the construction of the most dangerous construction link,effectively guide the on-site construction.(3)the reasonable side multi-arch tunnel excavation in order to study the root causes of the controversy,and points out that should look after the excavation of the lateral force perspective from the tunnel excavation inside,from the Angle of the slope body,should first excavation medial lateral after excavation.(4)the study of bias multi-arch tunnel pre-reinforcement measures,several strengthening treatment measures are put forward,and the respective treatment effect were evaluated.(5)of the causes of common diseases of multi-arch tunnel,bias multi-arch tunnel quality safety guarantee measures are put forward.(6)the middle wall multiple-arch tunnel offset monitoring method is proposed,according to the statistical regularity of monitoring and early warning value is put forward.