Single-pile cyclic loading model test system capable of preparing anisotropic sandy soil sample

Abstract

The invention relates to a single-pile cyclic loading model test system capable of preparing an anisotropic sandy soil sample. The single-pile cyclic loading model test system comprises a model casing preparation device, a single-pile horizontal cyclic loading device and a slide rail, wherein the model casing preparation device comprises a model casing mechanism, a sand pouring mechanism and a sand scattering mechanism; the model casing mechanism is connected with the slide rail in a sliding manner; the sand pouring mechanism and the single-pile horizontal cyclic loading device are sequentially erected above the slide rail; the sand scattering mechanism is arranged on the sand pouring mechanism. Compared with the prior art, the single-pile cyclic loading model test system can finish preparations of different anisotropic sandy soils, the sand scattering height can be adjusted to change the compactness of the sample, and a hopper can be mechanically operated in the sand scattering process, therefore, both time and labor are saved, and the uniformity of the sample is guaranteed; accurate control and continuous and stable output of the horizontal cyclic load in the single-pile cyclic model test can be realized; a support frame for sand scattering can also serve as a pile sinking device; a sample preparation device and a loading test device are integrated, the functions are complete and the operation is simple and convenient.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering physical simulation, in particular to a single pile cyclic loading model test system capable of preparing anisotropic sand samples. Background technique [0002] In recent years, my country has accelerated the pace of development and utilization of offshore wind power projects. The large-diameter single-pile foundation has become the foundation form of offshore wind farms with the highest utilization rate for offshore wind farms due to its advantages of simple installation, fast construction speed, and good economy. The literature "Doherty P, Gavin K. The shaft capacity of displacement piles in clay: Astate of the art review. International Journal of Geotechnical and Geological Engineering, 2011, 29(4): 389-410" pointing out that 75% of the built offshore wind power foundations are large-diameter piles Pile foundation, with the rapid development of my country's offshore wind power c...

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Problems solved by technology

Through the geotechnical centrifuge test, a good model similarity relationship can be obtained, but the cost of the centrifuge test is high, and the number of cycles is limited. At present, the most widely used model test is the model test under the condition of 1g (constant gravity), through parameter dimensionless Correspondence between 1g model test and field prototype can be established, as in the literature "LeBlanc C, HoulsbyG T, Byrne B W. Response of stiff piles in sand to long-term cyclic lateralloading. Geotechnique, 2010, 60(2): 79 -90" proposed dimensionless approach

At present, the loading devices for long-term horizontal circulation of single piles are basically similar to the equipment developed by the above-mentioned LeBanc et al. (2010). Large error, low degree of automation

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