地基冻-融循环离心模型试验研究

在清华大学已完成的模型的模拟试验基础上 ,对地基经两个冻 -融循环进行离心模拟的重复试验 ,两个重复试验数据几乎一致表明该套寒区离心模型试验装置和测试系统是可行和可靠的 ;相同条件下有荷和无荷地基在冻 -融循环下重复试验显示 ,适当的荷载可抑制地基冻胀 ;自由冻胀量与实际相符 ;地基内温度变化情况和相应的冻胀融沉特征相同、数据相近 ,说明试验数据正确

Centrifuge modelling tests of foundation undergoing two cycles of frost heave and thaw settlement

Analysis of cold regions engineering is one of the key topics in geotechnical engineering, especially research on frost heave and thaw settlement of soil foundations. Many difficult problems can not be solved in either in situ or physical model tests because of time and the difficult conditions. However, geotechnical centrifuge modelling technology can be used to model these complex problems. On the basis of previous modelling of models results for frost heave of soil foundation, soil foundations undergoing two cycles of frost heave and thaw settlement were conducted in a closed system. The displacement and temperature distribution characteristics in the soil foundation for the two repeated tests are very similar to each other and actual foundation measurements without water supply. A suitable load can restrain the foundation frost heave. The repeatable test results show that the strong box and data logging system are reliable in cold regions. The cold regions engineering centrifuge modelling system is a powerful tool for research on frost heave and thaw settlement.