Study On The Rapid Construction Of Shallow Buried、Weak Rocks And Large-span Flat Tuanel

A large number of highway projects will be build construct accompanied with theconstruction of infrastructure by the state’s vigorously promote the construction ofinfrastructure; highways will become wider and longer with the development of nationaleconomic, There will be many large cross-section tunnel will be put into the building. Inthe context of rapid growth，Many construction units pursuit progress by one-sided，andthe construction level of each construction enterprise are varies greatly,in addition It isno code’s guidance in the related design and construction now, In addition, The tunnelsare generally control projects in the highways construction, It will often impact theschedule of the whole route. So the research on the design of support parameters andrapid construction technology is especially urgent. This dissertation firstly carries out astudy on rapid construction in the large cross-section tunnel under the conditions of theshallow-soft-surrounding-rock rely on the Bo-Shen highway V-class surrounding rockengineering project,Mainly carried out the following work:(1) The author carries out a study on recent mainly performance of the ineffectivedeformation control under the conditions of the shallow-soft-surrounding-rock throughthe surveys and analysis on the status quo of design and construction in domestic tunnelunder the conditions of the shallow-soft-surrounding-rock, And the author putsforward some corresponding process control methods, In order to achieve the rapidconstruction of the large span tunnel under shallow-soft-surrounding-rock.(2) The article carries out Three-dimensional numerical simulation on the CDmethod, the CRD method and both side heading method, Analysis of the stress anddisplacement which the supporting structure and surrounding rock changes by thevarious methods caused by the advance distance of the excavation, Carries out thecomprehensive comparison on three construction method in ultimate displacement ofsurrounding rock、safety coefficient and the measurement value of each monitoringpoint.(3) We conduct the monitoring measurement on the CD method construction in theV-class surrounding rock of ShiGu tunnel, carries out the analysis and research on thedata, and also carry out the comparison between the date of monitoring measurementand the data of FLAC numerical simulation.(4) According to hard rock which above level III, Carried out the Optimizationseparately from three aspects which are as follows,lectotype and mating of mechanical equipment、drill blasting techniques and drifting cycle.