Study On Force Characteristics Of Loess Area Tunnel Structure System In Interface Of The Soil And Rock

With the implementation of the strategic plan of the country’s western development, infrastructure construction in the western region has also been rushed development, loess highway, railway, water gas tunnels are increasing year by year, construction and operational security issues faced by more and more. So the study of loess region architecture tunnel stress characteristics is very serious, because most of the loess tunnel area not only in the loess formations, tunnels loess area in soil and rock layers become in many cases, so the Research in the area should be taken seriously enough.Methods In this paper, the status of the tunnel theory loess areas and problems at home and abroad on the basis of a large number of summary, choose to take the tunnel in the loess region for that stratum- structure model, and according to engineering example, the Metro Tunnel into Only in loess strata in tunnels and in two categories become layers of soil and rock tunnels, relying on engineering example, large-scale application of ANSYS finite element calculation software, through a finite element model of the tunnel cavern, a variety of different conditions loess area architecture tunnel stress characteristics were analyzed.Through the study of loess layers of two different structural systems tunnel lining thickness characteristics of the force, and these two conditions loess tunnel architecture force characteristics were analyzed and compared. The thickness of the lining around the loess obtained to increase tunnel is influential, in a certain range, lining thickness h, the tunnel structure has a larger displacement, stress is large lining, and when the lining thickness is thick, the displacement of the tunnel structure smaller, less stress lining the tunnel structural system will be more stable.Respectively, from the interface of the soil and rock effect change position in the corners of the tunnel excavation, arch of the foot, the arch interface of the soil and rock architecture tunnel stress characteristics. Loess layers and interface of the soil and rock conditions compare tunnel structural system characterized by force. Obtain interface of the interface of the soil and rock location change in the structure of the tunnel system will have some impact, when all other conditions constant, the interface of the soil and rock location closer to the surface position change layer lining the need to reduce the stress on it tunnel structural system will be more stable. Interface of the soil and rock of loess area in the lower part of the rock tunnel architecture part of the burden of power, preventing the tunnel structure system have a greater deformation.