人工冻结粘性土的冻胀特性研究

Frozen-heave Character Study of Artificial Frozen-Clay

冻结法在矿山建设方面应用已越来越多,冻胀对施工的影响也不容忽视,对冻胀进行研究很有必要。通过自行研制的冻胀仪进行试验,并根据试验结果,比较分析两淮地区人工冻结粘性土在不同地层深度和土质下的冻胀特性,以及相同土样的砂质粘土在不同含水率下的冻胀特性,得出了冻胀力和冻胀率随着地层深度的增加而减小的特性。并研究了相同砂质粘土土样在不同含水量下的冻胀特性,得出了相同土样的砂质粘土冻胀率随着含水量的增大而增大,特别当含水量大于塑限时冻胀增量更大的物理特性,对工程应用具有一定的参考价值。

Frozen method has more and more been used in mine construction, The influence of frost heave on construction should not be ignored. and it is very necessary to study the frost heave. With the use of the frost heave instrument made by ourselves and according to the result of experiment,the frost heave character of different qualitive clay and same kind of sand -clay soil under different moisture capacity at different stratum depth in Huai Nan and Huai Bei are compared and analyzed. It is concluded that the frost heave force becomes little with the decrease of stratum depth, and so dose the frost heave percentage The study of the frost heave character of the same kind of sand -clay soil under different moisture capacity come to the conclusion that the frost heave percentage become big when the moisture capacity increases ,especially when the moisture capacity is more than liquid limit the frost heave increment become more greater .It is of much value to the application of engineering.