论文部分内容阅读
在季节冻土区,反复冻融作用导致土体孔隙水压力发生变化,进而导致土体中水分的迁移;对土体施加静荷载,土体内部应力场发生变化,土体内的水分和孔隙水压力亦发生变化。通过模型试验,研究无荷载和荷载两种条件下土体内部孔隙水压力和水分场随冻融循环作用的变化规律,试验结果表明:在荷载和无荷载两种条件下,孔隙水压力在初期呈负值稳定变化,然后快速增大,最后呈周期性变化。在无荷载条件下,随着土体深度的增加,孔隙水压力增大,水分含量减小;在荷载条件下,土体上部和中部位置处的孔隙水压力和水分含量都大于荷载两侧。在一个冻融周期内,土体内部孔隙水压力和水分含量都随温度的升高而增大,随温度的降低而减小,而且孔隙水压力和水分含量随温度的变化都具有滞后性。
In the frozen season, the freezing and thawing of soil leads to the change of pore water pressure, which leads to the migration of soil moisture. When static load is applied to the soil, the internal stress field changes, the soil water and pore water Pressure also changed. Through the model test, the variation law of pore water pressure and moisture field with the freeze-thaw cycles under both no-load and load conditions was studied. The experimental results show that under both load and no-load conditions, A negative change was stable, then rapidly increased, and finally cyclical changes. Under the condition of no load, with the increase of soil depth, the pore water pressure increases and the moisture content decreases. Under the loading conditions, the pore water pressure and water content in the upper and middle soil are greater than the load. During a freeze-thaw period, pore water pressure and moisture content in soil increased with increasing temperature, decreasing with decreasing temperature, and both pore water pressure and moisture content had hysteresis with temperature.