Research On Injection Grouting Technology Of The Construction Of Tunnel In Submarine Developing Belt Of Permeable Channel

The mainly difference of design and construction between land tunnel and subsea tunnel is water control. How to deal with the high-pressure blow is a important but difficult problem. The geological Environment of underground construction is very complicated, especially subsea tunnel. After a long time of diagenesis and transformation, we can found lots of faults in rock interior, including microcracks, pores and macroscopic discontinuity surface such as joints. They provide the place for the storage and translation of groundwater. Usually, there is confined water in subsea tunnel construction, without efficient plugging, it will lead to enlargement of flow path even serious water bursting and collapse, especially in development zone of permeable channels. In this paper, the author made a further study on the grouting mechanism of permeable channels developed zone and different influencing factors to grouting effect. In the end of the article, the author applied grouting technique of permeable channels developed zone to KiaoChow Bay subsea tunnel. Main research contents as follows:(1) On the foundation of widely research on worldwide literatures, the author uses others' research results for reference and comprehensively analyzing the characteristics and grouting mechanism of permeable channels developed zone.(2) Conduct field grouting test so as to determine proper grouting material and parameters of permeable channels developed zone. The result was combined with the engineering geology and hydrogeology of Kiaochow Bay subsea tunnel to make a study on grouting technique of permeable channels developed zone.(3) To f2-3 fault fracture zone, the author made a grouting and blocking water design through theoretical analysis and field test, and then determine proper grouting parameters. Finally, grouting effect is evaluated by comprehensive means.(4) Using numerical calculation method to analysis the pre—and post grouting seepage and water inflow changes of permeable channels developed zone, study the seepage characteristics of permeable channels developed zone and the relation between grouting parameters and water inflow.