Development For Test Platform Of The EPB Shield Synchronous Grouting

Simultaneous grouting technology is a technology that uses a material of highstrength and speed of frozen to inject into the shield tail gap timely and fully, preventingtunnel collapse. Good grouting effect has a decisive significance for tunnel safety,control of surface subsidence and improve the efficiency of shield construction, and it isalso a new topic for research and exploration at home in recent years. our country plansto build large-scale subway, highway, water conservancy facilities in the next five years,great demand for the shield, however, because of foreign monopoly, disadvantage in themarket competition. Therefore, for the status of lacking of the grouting test platform andthe crunch time in research, for helping research, this article attempts to develop a set oftest platform for synchronous grouting. The main research contents of this topic are:Using similar theoretical ideas on the platform model for rationality in-depthstudy, selection of grouting platform, for the composition of complex parameters ofplatform, taking the method of respective similarity judgment after discretization, andusing similar to second theorem and dimensional analysis method for solving similarconstants as a judgment basis to determine similar reasonableness of the relationship.Basing on classical soil mechanics theory and the design of mechanical structure tosolve the problems for soil box reasonable, for the requirements of shield constructionenvironment, designing the structure of loading mechanism and the promote mechanism,and complete the design, calculation and selection of hydraulic system. Strive to makesimulation results more authentic.For extensive literature collection, comparing the advantages and disadvantagesof existing platform home and aborad. Propsing a analog grouting system of low-costand high-efficiency, taking load sensitive technique as a protection of accuracy andeconomy for grouting system, and study on its energy consumption and works.Taking safety of test and reliability of structure design into consideration, analyzing the established part of platform components（including soil test box, theplatform cover, support columns and loading floor）for static, studing the characteristicof strength and displacement as a necessary supporting conditions for platform design.Above the study of static analysis, studying the issues of service life, in order toimprove and confirm the rationality of design, analyzing the fatigue of the parts（oncover, loading floor）.