Research On The Mechanism Of Failure Of Soft Rock Roadway With High Geo-stress And Bolt-grouting Technique

Research support technology of soft rock roadway with the high geo-stress of mine has important theoretical and practical engineering value. This article is based on roadway repair project of Wei Jia di coal mine, use the manner of combine assume study deformation of the surrounding rock of soft rock roadway with the high geo-stress and repairing technology by theoretical analysis, in-situ monitoring and FLAC-3D simulation method. The main contents and conclusions are as follows:(1) Studied the deformation failure mechanism for soft rock roadway with the high geo-stress,the main impact factor of stability for soft rock roadway with the high geo-stress is analysised.are the nature of surrounding rock, location and depth of roadway, the role of groundwater, roadway cross-section size, methods of explosion, exposure time, the impact of mining, the impact of tectonic stress, support the type of care and so on.The impact of stability of soft rock roadway with the high geo-stress main factors: the nature of surrounding rock, location and depth of roadway, the role of groundwater, roadway cross-section size, methods of explosion, exposure time, the impact of mining, the impact of tectonic stress, support the type of care and so on.Deformation of soft rock roadway with the high geo-stress with rock rheology, large deformation, unmanageable.(2) Research surrounding rock loose circle range tests the by drilling within endoscope. analysis of the destruction main reason for the second rock cross-cut roadway. Completed the repair support design of soft rock roadway with the high geo-stress to determine the anchor bolts (cable), bolt-grouting combine support program as the second rock cross-cut semi coal and rock roadway rework the program, given the support parameters.(3) Design construction monitoring programs of roadway rework .the use of information technology construction for the roadway deformation, the law of anchor bolts (cable) force in-situ monitoring. The results showed that: deformation of soft rock roadway with the high geo-stress mainly between two groups of convergence and at the end of the main drum. Anchor cable to control the deep tunnel plays an important role in rock deformation. Grouting can be loosely cemented rock into a whole, making a total length anchor of anchor blots and anchor cable has become, to be effective in controlling the deformation of surrounding rock.(4) FLAC-3D software used for the tunnel excavation of three-dimensional simulation of the construction process for full coal, an analysis of surrounding rock deformation before and after support evolution to study the deformation of the roadway and the roadway heading face away from the relationship between the discussion of the second rock cross-cut roadway roadway construction on the stability of neighboring law proposed roadway on the the second rock cross-cut reasonable construction measures.