Research On Rock Pressure And Construction Mechanical Effects Of Shallow-buried Bilateral Bias Neighborhood Tunnel

With the rapid development of China’s highway construction business and thewestern development unceasingly thoroughly, the mountain highway tunnelconstruction present a swing of the situation. The number and type of highway tunnelconstruction increasing number of technical problems encountered in which more andmore. This paper Relying on shanxi XinBao highway tunnel construction, from theoryanalysis and monitoring and numerical simulation, to the shallow buried bilateral biasneighborhood tunnel construction of the surrounding rock stress and mechanical effectfor a more in-depth research. The main research work and the results are as follows:①The research shallow buried bilateral bias neighborhood tunnel damage mode,and put forward the consideration of the construction sequence of hole about bilateralbias neighborhood tunnel of the surrounding rock stress calculation method.②Select a typical tunnel shallow bilateral bias neighborhood sections for theanalysis object, the monitoring measurement (surrounding rock and the primary supportcontact pressure, vault settlement and surrounding convergence) and numericalsimulation, comparative analysis, confirmed the rationality of the surrounding rock andsupport parameters, and initially established from the two-dimensional numericalanalysis the mechanical characteristics of class tunneling.③Based on actual project from the surface gradient (15°,30°,45°), differentcover layer thickness (10m,20m,30m), the asymmetric bias excavation sequence andother factors, research on shallow bilateral bias neighborhood tunnel excavation,construction of mechanical effects.④By the method of finite element numerical simulation, set up a shallow buriedbilateral bias neighborhood tunnel of three dimensional numerical model and researchedthe model of tunnel excavation space effect, according to the relevant theory of thatsuch tunnel excavation and minimum around the hole should keep distance excavation,provides a reference for the similar projects.