Dynamic Behavior Of Surge Tank In Strong Ground Motion Zone And Complex Geological Condition

The surge tank is one kind of common hydroelectric station building, which used for reflecting the water hammer pressure in pressure pilotage or tail water system. This is embedded in the rock mass, so it belongs to underground structure. Therefore, geology condition and the earthquake load effect are comparatively sensitive to the surge tanks. At present, the earthquake resistance study and design of the serge tank, mostly adopt draft static method. Static method does not count interaction between surrounding rock and liner, views the surrounding rock and the liner as two independent system, so the calculates does not always reflect the surge tank earthquake response. With hydroelectric development, more and more surge tanks building in intense earthquake and complicated geology condition area, how does this kind of surge tank's dynamic performance as well as how conduct the dynamic performance research reasonably accurately, is one of the engineering technology difficult problems which worth further studying.Based on studying the present situation in traditional ground structure earthquake resistance and the design of the serge tank, this article inferred the structure mechanical analysis equation of motion, the structure self oscillation analysis, the time interval mechanical analysis fundamental equation, and conducted the research and the discussion to the above equation's solution method and the step. And then, take Morocco hydroelectric station's surge tank which in intense earthquake and complicated geology condition area as an example, has built the 3-D static and dynamic finite element model by the large-scale finite element software .Analyzes the surge tank's strain of 3-D ,which being under construction and operation. And then adopt transient dynamics method, To the horizontal earthquake load function and the level and the vertical earthquake load coupling, it analyzed the surge tank's dynamics strain of 3-D, which being under construction and operation .Distribution and change law thereby, having gained the strain deformation being under construction under moving two kind load effects quietly building structure phase with operation pressure surge tank surrounding, shoring and lining. Calculation indicate, that surge tank under complex geological condition should be adopted working from above to below with layers in construction, gushes an anchor in time and defers the one-level lining step and when working slot hole location gets along under impedance mouth bottom board and bottom board as well as the structure shape has changes, the part plasticity appears easily to destroy area, these location should carry out the priority shoring and consolidates. The coupling effect horizontal and vertical earthquake load will driving surge tank's lining building architectural dynamic reaction intensive and vertical dynamic reaction also able to affect lining building structure's horizontal earthquake reaction. Therefore it is necessary that horizontal and vertical earthquake coupling effect, during the period of the anti-earthquake design and operation.Textual result, not only be the basis of anti- earthquake design that the electricity station relied on adjusts to surge tank, construction and operation, and also provide advice to similar engineerings. In the meantime. The research method adopted by this text,will draw lessons to the research of similar engineering problem.