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桩基础是冻土区大型结构物的主要基础型式,但目前学者对冻土环境中桩基动力特性的研究甚少。在比较分析国内外在该领域研究现状的基础上,设计了一套冻土-桩动力相互作用模型试验系统,主要包括动力加载系统性能参数的确定与设计、模型试验箱的设计与制冷效果分析、加载工作架的设计及其与试验箱的拼接等。试验结果表明,所设计的试验系统能为试验提供所需的冻土环境,结构牢固,能较好地模拟分析冻土-桩动力性能,此外该试验系统还可应用于其他冻土问题的试验研究。
Pile foundation is the main foundation for large structures in permafrost regions. However, few studies have been done on the dynamic characteristics of pile foundations in frozen soil. Based on the comparative analysis of the research status in the field both at home and abroad, a set of experimental system of permafrost-pile dynamic interaction is designed, including the determination and design of the performance parameters of the dynamic loading system, the design and the refrigeration effect analysis of the model test box , Loading work rack design and the splicing with the test chamber. The test results show that the designed test system can provide the required permafrost environment for the test, firm structure, good simulation analysis of the frozen soil - pile dynamic performance, in addition the test system can also be applied to other frozen soil test the study.