Deformation And Stress Analysis Of Soft Rock Tunnel With Large Deformation And Small Distance

Due to the complicated geology, terrain conditions in the Middle and west of our country, a lot of tunnel engineering will be constructed on railway and highway in the future. Restricted by terrain with special geological conditions, the soft rock tunnel with small distance, a special structure will often appear. Taking Xin Cheng Zi tunnel on lan Yurailway as an engineering background, To study the deformation and stress of the soft rock tunnel with large deformation and small distance.author set up different distances models by using numerical simulation software FLAC3 D.In this paper, Binding in Xincehngzi tunnel of surrounding rock and steel arch stress field test, under the condition of the soft rock tunnel with small clear distance section,deformation and stress characteristics and rules are obtained. Provide the basis for the design and construction of soft rock tunnel in the future.the main work and results as follows:(1) Compare and analysis the deformation and stress distribution on hard rock and soft rock tunnels, Find out the main characteristics of the soft rock large deformation tunnel.(2) Mainly for Xin Cheng Zi,a small distance tunnel, analysis and research the stress and deformation of soft rock tunnel with large deformation situation analysis surrounding rock and supporting structure deformation and stress distribution through the method of the numerical simulation on different distancess tunnel.(3) Have a field test tunnel section stress distribution at small distance of Xin Cheng Zi tunnel. Through the on-site testing to the tunnel surrounding rock pressure, steel stress, contact pressure, two lining steel bar stress, analysis of the force of the supporting structure at small distance tunnel.(4) According to the field test of the Xin Cheng Zi tunnel and the dynamic tracking of construction process, aiming at problems in the construction process, and corresponding remedial measures, combined with theoretical analysis, research of soft rock large deformation tunnel construction control technology measures.