Research On Anti-aqueous Performance Of Grouting Meterials And Numerical Simulation For Diffusion Law Of Permeation Grouting

Grouting materials are usually applicable to the underground engineering, where the application environment is mostly abundant of groundwater. In practical engineering, grouting materials are required not only to have good work performance, but also to have excellent early anti-aqueous dispersions performance and late anti-aqueous solubility performance. The solidification mechanism and anti-aqueous solubility performance of grouting materials are theoretical analyzed and researched in this thesis, such as cement-like grouting material, cement-water glass grouting material and water glass-industrial waste grouting material. Through theoretical analysis and experimental data we can conclude that:(1) The anti-aqueous solubility performance of water glass-industrial waste grouting material is better than cement-like grouting material and cement-water glass grouting material.(2) The ideal model of grouting materials which have excellent anti-aqueous dispersions and anti-aqueous solubility performance are put forward. That is a formation which has high activity Silicon-Aluminum components, and the hydration products are CSH gel with anti-aqueous dispersions performance and Zeolite-like structural system with anti-aqueous solubility performance.Due to the complexity of grouted media and the invisibility of grouting engineering, it is difficult to simulate the grouting. In this paper, according to the characteristics of permeation grouting and reasonable assumption, the fundamental differential equation of permeation grouting was deduced and discretized for numerical calculation by the finite difference method. Then combining the initial conditions and boundary conditions, an implicit difference scheme of differential equations were established and solved by the chasing method. At last the diffusion law of grouting pressure with the change of diffusing time and diffusing radius was analyzed and the values of calculation parameters on the effects of grouting pressure were also demonstrated according to the engineering reality. The application of this model showed that the calculation results were in good agreement with the engineering reality. According to the engineering reality in this paper we can conclude that:(1) In the whole process of grouting, grouting pressure decreased with the increased of diffusing radius. The impact of grouting pressure was great when the value of diffusing radius was relatively small, while the impact was minor on the contrary. The researching results showed that the difficulty of grouting expanded according to the increased of diffusing radius, it was easy when the value of diffusing radius was relatively small. (2)At the same diffusion radius, the grouting pressure increased with the extended of grouting time. It was gradually stable when the grouting time exceeded 1500 seconds. The grouting pressure had significantly changed in the grouting internal zones and not obvious at the end of region. (3) In finite difference algorithm, the different forms of meshing caused the different values of the calculated parametersλandη, but the computational results through the theoretical analysis and engineering reality in this thesis showed that the effects on grouting pressure byλandηis very small. This showed that the implicit difference scheme is unconditional convergence and absolute stabilized.