Surrounding Rock Deformation Regularity And Control Technology Research In Grouting

In recent years, Many major infrastructure projects put into construction such as traffic engineering, hydraulic and hydroelectric engineering^mine engineering in our country,a lot of deep buried tunnels (hole) and deep tunnels are now under construction, sudden flood water, landslides and other geological disasters have occurred in construction process because of the complexity of geological conditions, in which the water disaster is most severe. Grouting is an effective method of governance bursting and gushing water in underground engineering. In grouting process, the grouting quality depends on the grouting parameters(grouting pressure, grouting quantity, etc.), grouting materials, and grouting techniques.In grouting of weak broken wall rock, grout of dead weight, grouting pressure and water pressure have combined effect of the surrounding rock and supporting structure, which result in deformation of surrounding rock and secondary disasters. Surrounding rock deformation law and safety control technology under the action of grouting need to be studied.In this paper, the research uses the seepage-stress coupling theory, numerical analysis and field monitoring method and main analysis of surrounding rock deformation effect factors and regularity in grouting, surrounding rock deformation safety control technology in the process of grouting is put forward and applied to practical engineering. Surrounding rock deformation of main control factors was studied in grouting, including grout of dead weight and grouting pressure, grouting tube length, grouting hole arrangement, etc. The study of the rule in the rock mass seepage field and displacement field by selecting typical tunnel excavation section and establishing porous medium fluid solid coupling mathematical model using COMSOL analysis software analyzes. The system research of factors impact on the deformation of surrounding rock about grouting pressure, grouting tube length and rock grade in the grouting process, when rock grade is determined, with the improvement of grouting pressure, the rock deformation increase. Grouting pressure>6MPa, the rock grade underⅣ, the roof rock deformation rate>3.5mm/h. When grouting pressure is determined, with the rock grade decreased, the rock deformation increases. When the rock grade under IV, grouting pressure>4MPa, the roof rock deformation rate up to3.0mm/h. When pressure grouting and rock grade is determined, with the grouting tube length increases, the rock deformation decreased,rock grade under IV, grouting pressure<6MPa, the grouting tube length should not be less than5m, grouting pressure>6MPa, the grouting tube length should not be less than9m. Based on rock deformation law in grouting, the grouting parameter design and safety control method studied and put forward rock deformation safety control technology under different the condition of grouting, including grouting design based on rock deformation control technology, the shallow rock reinforcement and late grouting governance technology, deep drainage pressure discharge and grouting seal control technology.Long-term monitoring mechanism of rock deformation safety control in the process of grouting is established.With the combination of rock stability monitoring,the groundwater flow field characteristics and ecological environment monitoring to ensure the surrounding rock stability and security.