Study On Stability Of Small Arch Collapse Cavities And Treatment Measures Of Highway Tunnel In Soft Rock

As a tunnel collapse in one of the most common disaster phenomena. At present, theissue of tunnel collapse focused on the Causes and Treatment Measures for stability analysiscollapse of the cavity surrounding rock yet systematic analysis, Under normal circumstances,the tunnel collapse Treatment mainly for large and medium-sized cave accidents, landslidesaffected less attention to small, but it works in practice, in many cases large andmedium-sized by a small landslide landslides are not able to get timely treatment caused; andtunnel collapse accident larger proportion of a small landslide.Therefore, to carry outsmall-scale collapse of the cavity surrounding rock stability and Treatment Measures for safeconstruction has important guiding significance. Based on the characteristics of weak rocktunnel collapse, using statistical analysis, theoretical analysis and numerical simulationmethod, the stress field under its own weight highway tunnel collapse of the cavitysurrounding rock stability and treatment measures in-depth study. The main contents are asfollows:1. Under the conditions and there is no support in tunnel collapse accident statistics ofsupporting conditions, statistical analysis of the contents of the main cave shape, location,timing, causes and Treatment Methods tunnel collapse.2. On the basis of statistical analysis, the conditions for the absence of supporting archedtunnel collapse numerical simulation analysis of the collapse of the cavity surrounding rockdisplacement field, stress field and plastic zones.3. On the basis of statistical analysis, the conditions for support under the arch tunnelcollapse numerical simulation analysis of the collapse of the cavity surrounding rockdisplacement field, stress field, rock plastic zone and forces supporting structurecharacteristics.4. In the absence of supporting conditions have vaulted tunnel collapse analysis ofsimulation results based on support conditions, respectively, according to the collapse of thecavity surrounding rock plastic zone location or site of the most severe stress relaxation of thetunnel collapse under two conditions Treatment plan proposed, the numerical simulationanalysis, the displacement variation under different stages of construction in various parts ofthe tunnel, rock plastic zone changes, as well as supporting force structure, and makes acomparative analysis of the Treatment programs Treatment effect evaluated.