Research On Stress And Deformation And Construction Control Of Large Ratio Of Length To Width Open Caisson In High Water Level

With the rapid expansion of industrial scale, industrial equipment foundation also showed a large trend, we encounter the inevitable in the construction of the deep pools and equipment foundation, while construction of the underground water level and high area, in order to ensure the foundation construction quality and progress, will be used to sink a well and the method of underwater bottom sealing construction. Open caisson as a basic structure, is a deep foundation of the upper load to the foundation.First of all, by Ling steel twelfth five structural adjustment technical transformation project public auxiliary dumper chamber fabrication of open caisson engineering, detailed in the high water level under the big ratio of length to width caisson from design, production to the whole process of construction, design ideas, including the engineering background, the construction of the main steps such as production, construction drainage caisson, caisson sinking coefficient and the anti floating design, open caisson. Sleeper extraction difficult phenomenon was found in the construction, only a small amount of sleepers complete extraction. On the emergence of open caisson construction process were discussed, summed up the easy problems in sunk well construction and effective control method, the construction in the future with no sleeper construction method, according to the precast caisson weight, increase the edge at the foot of sand cushion thickness, layer compaction, between edge foot and sand pouring cushion concrete cushion. Prior to settlement with a sledgehammer, pneumatic pick the concrete cushion can be broken, digging sinking suggestions. For the high water level under the big ratio of length to width of open caisson construction provides a reasonable construction plan and the effective control method.Secondly, by using the finite element software PLAXIS, simulated a large ratio of length to width of open caisson wall soil pressure and deformation characteristics, the calculation results show that the caisson has strong space effect, in the corner of wall lateral displacement is smaller, the maximum lateral displacement at the central office, the whole is a deformation skirting "; lateral displacement and lateral displacement open caisson is far greater than the short side of the long side of the lateral displacement of the long edge, more should pay attention to, when necessary, need to set up support, to reduce the displacement of the objective.In this paper, through the practical engineering and finite element simulation, given the high level of the large ratio of length to width of sinking well design and construction suggestions, provide a reference for practical engineering.