推進工法における薬液注入に関する検討

概要

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Recently, small-diameter shallow tunnels are often constructed by using slurry pipe-jacking method. This is the sewage tunnel drivage method. This system involves the pushing or thrusting of a drivage machine through concrete pipes ahead of jacks. Chemical grout injection into the surrounding soil around the tunnel is carried out before/after the drivage and pushing processes. The purpose of the chemical grout injection is to maintain a permanent stability of the surrounding soil. However, the behavior of the chemical grout solution in the surrounding soil around the tunnel is not clarified.<BR>From these points of view, a numerical simulation model was developed in order to clarify the behavior of chemical grout solution. This model consists of a set of non-linear partial differential equations, the flow equations and the mass transport equations. The flow equation considers the effect of viscosity variation of the injected grout solution. As a chemical grouting process was analyzed by using this model, the permeation and the distribution process of the injected chemical grout solution was clearly understood.<BR>Moreover, the effectiveness of the chemical grout injection was evaluated by using non-linear FEM analysis. From this results, the relation between confining stress and Young's modules of the soil/grouted zone should be taken into consideration when the range of the grouted zone is designed.
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