Study On The Reasonable Spacing Of The Neighburhood Tunnel On Freeway By Considering The Impact Of Blasting Excavation

This paper first analysis factors affecting reasonable spacing of neighburhood tunnel theoretically.Factors affecting reasonable spacing of neighburhood tunnel are divided into two categories:static factors and dynamic factors.And details the two major categories of factors respectively.Second recount the overview,design and construction method of this research subject's supportive projects--neighburhood tunnel in Huang Qu Nan expressway. Finite element numerical model is esteblished by this supportive projects.The reasonable spacing ofâ…¤,â…£,â…¢-class of surrounding rock which consider the impact of tunnel excavation are analysised respectively.Third research the blasting vibration of Qian Yu neighburhood tunnel in Huang Qu Nan expressway by numerical simulation method.Numerical simulation adopts finite element dynamic analysis method,and analysis field test section's blasting vibration of Qian Yu neighburhood tunnel,and get vibration velocity of monitoring points by numerical simulation method.Then compare calculation results with field test results to verify the validity of finite element dynamic analysis method.At last the reasonable spacing ofâ…¤,â…£,â…¢-class of surrounding rock which consider the impact of tunnel blasting was researched by finite element dynamic analysis method,and get the final conclution by comparing the research conclution with Chapter 4's conclution.