Research of the deformation characteristics model test of tunnel-landslide orthogonal system
[Objective]For the landslide-tunnel system,the deformation and instability of the landslide is an important cause of the tunnel disease.In order to study the macroscopic deformation characteristics of the landslide-tunnel orthogonal system when the landslide is unstable.[Methods]In this paper,the Yangpoli landslide tunnel was taken as the research object,and 12 groups of indoor model tests were carried out by using the self-developed traction landslide grading sliding simulation test de-vice.The influence of tunnel burial depth,tunnel arrangement position in the sliding body and sliding section position on the'displacement index of tunnel surrounding rock'under the condition of landslide instability in the landslide-tunnel orthogonal system was studied.[Results]The conclusion were as follows:There is a certain regularity in the macroscopic deformation of the slope when the landslide is unstable,which is usually manifested as the trailing edge cracks and secondary cracks of the slope,and the slope displacement has obvious grading along the secondary cracks.When other variables are the same,the greater the buried depth of the tunnel in the landslide body,the closer the tunnel arrangement position is to the leading edge of the landslide body,and the closer the sliding section is to the middle section of the landslide,the greater the influence of land-slide sliding on the displacement of the soil in the range of 0.5～1 times the diameter of the tunnel around the tunnel.The posi-tion of the sliding section has the greatest influence on the displacement index around the tunnel.When the sliding section is located in the front,middle and back sections of the landslide,the displacement index around the tunnel is less than 0.8,greater than 1.8 and between 1.0 and 1.5,respectively.[Conclusion]The research result can provide some reference for the research on the deformation evolution mechanism of landslide tunnel,the prediction of tunnel diseases induced by landslide and the prevention and control technology.
tunnel-landslide orthogonal systemdeformation characteristicsmodel testdisplacement index of tunnel surround-ing rocklandslidesinfluencing factors
万方数据
维普
