冻土前期固结压力的试验研究

前期固结压力 在土力学中占有重要的地位。对于融土， 是土受力历史的重要指标，与土的力学性质有着密切关系；对于冻土，由于冰和土颗粒骨架的联结使其具有一定的结构性，也应当具有类似前期固结压力的指标存在。以冻结青藏黏土为研究对象，对不同初始干重度和不同温度下的冻土试样进行 压缩试验，采用双对数法得到冻土的前期固结压力 。研究表明，这个指标尽管不同于融土前期固结压力的概念，但其对于冻土的力学性质同样具有重要意义。试验研究还发现，冻土前期固结压力与干重度和温度具有一定的关系。

Experimental research on preconsolidation pressure of frozen soil

The preconsolidation pressure ( ) is an important parameter in soil mechanics. For conventional unfrozen soils, is an index of the loading history and has close relationship with mechanical properties of soils; for frozen soils, special structure exists due to the interaction of ice and soil grains. Similar index like the preconsolidation should exist in frozen soils. A clay obtained along the Qinghai-Tibet Railway is taken as research object. compression tests are carried out on remolded soil samples with a wide range of dry density under different negative temperatures. Double logarithmic coordinates are used for obtaining the preconsolidation pressure of the frozen soil. The testing results show that the preconsolidation pressure of the frozen soil is related to the initial dry unit weight of the frozen soil, while temperature is more dominant.