Research On Multilayer Coupling Construction Method And Its Reliability Of Super-large Section Underground Cavern

In this paper,we treat the cavity of super-large section as the research subject and discuss the new technology of multilayer coupling construction method. At the same time , the reliability in the cavity construction course are analyzed and we use the fluid-solid coupling ,fluid-solid-heat coupling and general stress analysis method to have a numerical analogue of construction course.In this paper, two kinds of new technology method in the construction of large-scale cavity are researched. During the construction ,we use the excavation method of first excavating pilot tunnel and the top layer,middle layer and the bottom layer parallel fly-over crossing. This method can create several working planes and its efficiency is very high. Meanwhile, it can also make the technology creativity in the multilayer coupling construction of the big cavity come true. When we blast the adjacent cavities ,we optimized the undermine method .So it can not only make the condition of near planes get better and the effects of explosion griping reduced, but also reduce the quake brought by blasting. We also based the advanced blasting technology to realize the time-lag stagger peak with little error and ensure the couple of strabismus simultaneous blasting. Thus,we can ensure the dual benefits of reducing quake and efficient.Through the analysis of the Monte-carlo random finite element and the system reliability method ofβembranchment method, we consider to combine the two theories, and the reliability analysis method is used in the construction of the big cavity. We analyses the every excavation step, and at the same time analyses the around rock's sensitivity, and get the sensitivity rock parameter. The several layers excavating at the same time and the layer by layer excavating are analyzed, and the two method's shortcomings and merits are compared. So a full knowledge about multilayer coupling construction method which provides reference for the fast excavating can be got.In this paper actual porous media is took as a perfect continuous media with macroscopically continuous media method, and the coupling relationship among the fluid field is analyzed, the solid field and the thermal field. Effective stress theory is used in seepage problem of groundwater on the condition of changed- temperature,...