水平荷载桩室内模型试验系统研究

doi:10.13722/j.cnki.jrme.2014.0091

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Abstract Lateral bearing capacity of pile was influenced by deformation characteristics of pile surrounding soil obviously. However，the deformation characteristics of pile body could be obtained，while the deformation characteristics of pile surrounding soil was hardly be obtained by using conventional testing methods. Therefore，one model test system using transparent soil and PIV(particle image velocimetry) technique was developed. The whole system contains a lateral loading system and an optical measurement system(including an optical platform，a CCD(charge-coupled device) camera and a linear laser，etc). The deformation characteristics of pile surrounding soil under lateral load were non-intrusively measured. Based on multi-slice soil displacement fields，a three-dimensional displacement field was obtained，and model test results were comparative analyzed with those of numerical simulation results. The test results show that the load- displacement curve of the pile under the lateral load was shown as steep drop type，which is similar with the bearing characteristics of laterally loaded pile embedded in typical dense sand. It also shows that rigid rotation destruction was happened in this test condition，and its rigid rotation point is nearly on 78% pile embedded length.

Key words： pile foundations lateral load model test displacement field transparent soil PIV technique

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2014.0091 OR http://www.rockmech.org/EN/Y2015/V34/Is1/3468

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