Effective pile length researching simulation test box for variable parameter super-long pile

Abstract

The invention discloses an effective pile length researching simulation test box for a variable parameter super-long pile. The effective pile length researching simulation test box comprises a test pile, a bearing table, a bottom plate, a conduction column, springs, a jack, a flexible loader, a test box body, a partition plate, a counter-force beam and a counter-force frame, and further comprises an optical fiber sensor, soil stress detectors and a test pile body variation layer. By means of the effective pile length researching simulation test box, tests of a super-long pile foundation under certain control conditions can be completed; the action mechanism of the super-long pile foundation is explored, and the effective pile length phenomenon is researched; the test pipe body is a pile capable of being assembled and disassembled, the outer layer of the pile body is wrapped by the test pile body variation layer, various pile body parameters such as the diameter of the pile and the friction and resistance coefficients between the pile and soil, the diameter of the pile end and other parameters can be varied, and the mutual variation of various parameters between the super-long pile and the soil body can be basically covered. Theoretical guidance and test data support are provided for the design of the super-long pile foundation, and the application and practice risks of the super-long pile foundation are lowered.

Description

technical field [0001] The invention belongs to the field of civil engineering, and in particular relates to a simulation test box for researching the effective pile length of super-long piles with variable parameters. Background technique [0002] In Shanghai, Tianjin, Fuzhou, Wuhan, Hangzhou and other soft soil areas with poor geological conditions, it is necessary to use a large number of super-long piles. For example, the Shanghai World Global Trade Center and Jinmao Tower used steel pipe piles with a depth of 80m, and the Ganghui Building in Puxi used bored piles with a depth of 85m. Super-long cast-in-place piles greater than 50m have been used in projects such as Ocean Plaza, Aodong Plaza, TEDA Plaza, Oujiahua International Trade Center, Huaxin Plaza, Jinhuang Plaza, Rainbow Bridge, and Haihe Bridge in Tianjin. 30 bored piles with a diameter of 2m are connected under the cap of the main pier of the South Taihu Lake Bridge in Huzhou. The pile length is 77m. [0003] ...

AI Technical Summary

Problems solved by technology

However, the indoor model test and on-site full-scale test of super-long pile foundations have not been reported so far, especially the pile and soil load transfer law of super-long pile foundations, and the mechanism and analysis of the joint action of pile-soil-cushion-cap The influence of method, pile type and pile arrangement method on the bearing properties and settlement of ultra-long pile foundations needs to be further studied.

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