Study On Crushing Mechanism Of Extruded Side Wall Of High Concrete Face Rockfill Dam

With the continuous development of the face rockfill dam, squeezing the side wall construction technology in the future high-rise rockfill dam project has been widely used has become a development trend. As the foundation of the concrete panel, the stress and deformation behavior of the extruded side wall will undoubtedly become a key factor affecting the stress state of the panel. However, the current engineering sector for the crushing of the edge of the wall and its stress and deformation of the understanding of the state still remain in the qualitative speculation stage, resulting in the stress deformation of the dam numerical simulation calculation will generally squeeze the wall and its stress and deformation The behavior is simulated by extreme conditions. Therefore, in order to improve the precision of the numerical simulation of stress deformation of high concrete face rockfill dam, it is necessary to carry out the research on the crushing mechanism of squeezing side wall.In this paper, the crushing mechanism of the squeezing edge wall is studied by using the test method for the two main load factors, which are caused by crushing the normal and the lateral pressure. Firstly, combined with engineering practice, the analysis method of material and structure simulation of extruded wall concrete specimen is carried out, including the design of assembly ratio, the design of the test piece and the method of making the specimen. The structural characteristics of the extruded side wall can be accurately simulated Secondly, the use of large-scale coarse-grained soil static and dynamic three-axis instrument, for different mix ratio, different lap length of the panel - squeeze the side wall - the edge of the wall - The compressive fracturing mechanism of the crush wall under the conditions of normal load and slope pressure is carried out under different confining pressure conditions. The results show that under normal confinement and slope pressure The results show that the larger the water-cement ratio is, the smaller the confining pressure is, the smaller the overlap length is, the sooner the crack appears, and the extrusion is the same as that of the fracturing. The cracks in the front wall appear first in the overlapping parts, and gradually to the middle of the larger thickness of the site, all cracks are generally parallel to the direction of the vertical panel; in the normal pressure load, The compressive strength of the compression wall is related to the water-cement ratio and the confining pressure, which is independent of the lap length. As the water-cement ratio decreases or the confining pressure increases, the compressive strength of the extruded side wall increases. Under the pressure load, the ultimate failure of the extruded side wall is independent of the water-cement ratio, the lap length and the confining pressure of the extruded side wall.In this paper, the experimental method is used to study the crushing mechanism of the compression wall of the high rockfill dam. The experimental results have certain reference value for the design of the face rockfill dam.