Research On Mechanical Properties Of Shallow Large Span Loess Tunnel And Construction Technology Under Structures

There has been success in the loess formations built a large number of tunnel engineering, but the audience displacement characteristics of loess tunnel, especially the expansion of large-span loess tunnel excavation in front after yet fully understood,the construction process, the mechanical conversion mechanism is not fully grasp.In this paper, Luoyang City West Ring Road Tunnel project weeks as the research background to study mechanical effect of the expansion of loess tunnel construction as a starting point, in-depth study of Zhou Shan Tunnel key technology to enhance the technical level of China’s expansive construction of loess tunnel.Through theoretical analysis, numerical simulation and construction process of tunnel excavation in front of the whole force displacement monitoring and support structure after rock analyzes Span expansion loess tunnel construction process converts the mechanical mechanism and Span expansion loess tunnel deformation control technology;master surrounding rock shallow large audience across expansive loess tunnel construction process deformation characteristics.At the same time this paper a numerical simulation of the island under wear Sun Xin road tunnel using three step method and the CRD method, comprehensive analysis of surrounding rock and supporting structure of the displacement, stress and deformation of the plastic zone, etc., and has carried on the contrast analysis with both. At the same time monitoring on the spot, and analysis of data processing.