The Research Of Layered Loess Tunnel Structure And Surrounding Soils During The Interaction Characteristics

With the development of western China, more and more infrastructure is being carried out in full swing, and the tunnel projects in loess region are also increasing year by year. Tunnel study of loess should be carried out imminently. Most of the tunnels are not in single loess layer, but most are in the layer between soil and rock. This article in view of loess-mudstone this common lamination situation, concrete study research tunnel structure and characteristics of the soil around interaction analysis.With the help of large-scale finite element software ANSYS, tunnel structure and characteristics of the soil around interaction in a variety of different working condition are analyzed. The analysis concludes the comparison of single loess and layered soil, the different locations on the straight wall, with different thickness lining in layered soil.Starting with the current situation and existing problems of loess tunnel, the content of this paper and research methods are determined firstly. Based on the stratum-structure model, the soil in loess tunnel is divided into two categories:single loess and the stratum under the stress of loess-mudstone. With the help of the large-scale finite element ANSYS software, this paper analyzed the interaction between tunnel structure and surround soils in different working conditions.Firstly, this paper analyzed the characteristic of the interaction between structure in single loess stratum and the surround soils, compared the conditions with two different thicknesses, and also compared the characteristic of the single stratum under these two situations.About to the interaction between loess tunnel structure and surround soils in the layered soils, from two aspects:loess-mud interface at the arch feet and the bottom of wall and different lining thickness, this paper compared the working situation when the layered soils in the same spite and with different lining thickness. According to the analysis of different lining thicknesses, soil deformation decrease with the increase of the lining thickness. At the section where mudstone acts the lining structure are in stable because of the characteristics of mudstone.