Study On Active Dynamic Control Deformation Of Tunnel Ahead Of Grouting Reinforcement

For forming a tunnel advance grouting uplift is built (structure) constructed from active dynamic control system. Firstly, this paper from the new tunnel caused deformation body layer, using the monitoring data and the numerical simulation to predict the settlement due to tunnel excavation; binding cavity expansion theory and elastic foundation beam theory is single hole grouting uplift is built (structure) constructed mathematical expression; using the mathematic software derived porous grouting mathematical expressions; combined with the monitoring feedback; finally forming tunnel grouting uplift is built (structure) to build active dynamic control the deformation of the system. Its main contents are as follows:(1) By collecting soil pressure box data, the new tunnel lining axial force was obtained, the finite element numerical simulation, combined with the field monitoring data, the calculation of the stress release rate of surrounding rock. In the same surrounding rock release rate, respectively, using linear elastic constitutive model, HS constitutive model and MC constitutive model, both settlement curve of building structure, and both the settlement monitoring data comparison of building structure, that HS constitutive model can better predict existing settlement rules of building structure.(2) The cavity expansion theory and MC failure criterion of soil grouting of additional stress, the simplified model is established, and combined with the theory of beam on elastic foundation is single hole grouting uplift is built (structure) building deformation equation.(3) By means of displacement superposition method, the mathematical expressions of the lifting of the existing building (structure) are derived by using the mathematics software and the optimization theory to analyze the reasonable distance between the grouting holes.(4) Using mathematics software analysis of six factors (coefficient of subgrade reaction, building (structure) of the bending stiffness, both built (structure) structures of upper load and buried depth, grouting hole to both built (structure) buildings from the base plate, grouting pressure, grouting hole) effects of grouting uplift, the above factors on grouting uplift is built (structure) constructed the mathematical expression of the effect.(5) By changing the expansion coefficient and loading method applied to numerical simulation of grouting uplift. In order to make the numerical simulation parameters and actual grouting engineering of grouting pressure and grouting volume selected corresponding; contrast setting deformation joint and not setting deformation joint of two existing building (structure) of grouting uplift effect.(6) Using the monitoring data analysis and numerical simulation to analyze the displacement and the influence range of the construction (structure) of the grouting uplift, and the theoretical contrast with the paper, to verify the rationality of the theory.(7) Trough the project example, using back analysis it is concluded that the new tunnel caused by existing settlement curve of building structure; using porous uplift grouting theory, get both built (structure) constructed porosity grouting uplift curve; combined monitoring information feedback. In order to form a set of tunnel leading grouting uplift existing building (structure) to build the active dynamic control of the deformation of the system.